JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 CAST-IN-PLACE CONCRETE 033000 - 1
SECTION 033000 - CAST-IN-PLACE CONCRETE
PART_1_-_GENERAL
1.1 RELATED DOCUMENTS:
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this section.
1.2 SUMMARY:
A. Extent of cast-in-place concrete work is indicated on drawings and in provisions of this section.
B. Concrete work includes, but is not limited to:
1. Footings & foundation walls. 2. Concrete slabs on ground as indicated on drawings. 3. Curing compound. 4. Slots, inserts, anchors, ties. 5. Preformed expansion joint fillers. 6. Set built-in items furnished by others. 7. Other concrete work indicated on drawings and/or specified therein (except as otherwise specified).
1.3 RELATED WORK:
A. Excavating,_Filling_and_Grading as specified in Division 31. B. Concrete_Reinforcement as specified in another Division 3 section. C. Unit_Masonry as specified in Division 4. D. Structural_Steel as specified in Division 5.
1.4 QUALITY ASSURANCE:
A. Use latest edition, including all addenda, revisions and supplements for all specifications, standards, and codes, referred to herein.
B. Applicable Standards:
1. American Society for Testing Materials (ASTM):
C-31 Making and Curing Concrete Test Specimens In the Field.
C-33 Specification for Concrete Aggregates.
C-39 Test for Compressive Strength of Cylinder Concrete Specimens.
C-42 Obtaining and Testing Drilled Cores and Sawed Beams of Concrete.
C-94 Specifications for Ready-Mixed Concrete.
C-138 Test for Unit Weight, Yield and Air Content (Gravimetric) of Concrete.
C-143 Test for Slump of Portland Cement Concrete.
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C-150 Specification for Portland Cement.
C-171 Specification for Vapor Retarder Sheet Materials.
C-172 Sampling Fresh Concrete.
C-173 Test for Air Content of Freshly Mixed Concrete by the Volumetric Method.
C-192 Making and Curing Concrete Test Specimens in the Laboratory.
C-231 Air Content of Freshly Mixed Concrete by the Pressure Method.
C-260 Specification for Air-Entraining Admixtures for Concrete.
C-309 Specification for Liquid Membrane Forming Compounds for Curing Concrete.
D-1751 Specification for Preformed Expansion Joint Fillers for Concrete Paving and Structural Construction (Non-Extruded and Resilient Bituminous Types).
D-1752 Specification for Preformed Sponge Rubber and Cork Expansion Joint Fillers for Concrete Paving and Structural Construction.
2. American Concrete Institute (ACI):
ACI 211-1 Recommended Practice for Selecting Proportions for Normal Heavyweight Concrete and Mass Concrete.
ACI 212-2R Admixtures for Concrete.
ACI 214 Recommended Practice for Evaluation of Strength Test Results of Concrete.
ACI 221-R Guide for Use of Normal Weight Aggregates in Concrete.
ACI 301 Specifications for Structural Concrete for Buildings.
ACI 302-1R Guide for Concrete Floor and Slab Construction.
ACI 304 Guide for Measuring, Mixing, Transporting and Placing Concrete.
ACI 305-R Hot Weather Concreting.
ACI 306-R Cold Weather Concreting.
ACI 308 Standard Practice for Curing Concrete.
ACI 311-4R Guide for Concrete Inspection.
ACI 318 Building Code Requirements for Reinforced Concrete.
ACI 347 Recommended Practice for Concrete Formwork. Clark Patterson Lee 03/27/2014
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SP-66 ACI Detailing Manual.
C. Contractor Qualifications: Minimum of two years experience on comparable concrete projects.
D. Requirements of Regulatory Agencies: Perform work in accordance with requirements of local, state and other applicable codes.
E. Tolerances:
1. Floor slabs:
a. Scheduled to receive resilient flooring: Variations not to exceed 1/8 inch in 10 feet from required plane. b. Where exposed concrete is scheduled: Variations not to exceed 1/4 inch in 10 feet from required plane.
2. Variation of building lines: 1/8 inch in 10 feet. 3. Variation in cross sectional dimensions: Minus 1/8 inch, plus 1/4 inch in 10 feet. 4. Deflection of form facing material between supports: Not over 0.0025 X span. 5. If any concrete varies beyond tolerances specified, bring concrete within specified tolerances by method approved by Architect at no extra cost.
F. Slab Curling:
1. Contractor shall properly cure and take precautions as necessary to prevent curling of concrete slabs. 2. If curling occurs, the Contractor shall make corrections by method approved by Architect at no extra cost.
G. Tests:
1. Concrete testing service: Employ, at Contractor's expense, an independent testing laboratory acceptable to Architect to perform material evaluation tests and to design concrete mixes. 2. Materials and installed work may require testing and retesting, as directed by Architect, at anytime during progress of work. Allow free access to material stockpiles and facilities. Tests, not specifically indicated to be done at Owner's expense, including retesting of rejected materials and installed work, shall be done at Contractor's expense.
H. Evaluation and Acceptance:
1. Evaluate each concrete mix test result separately in accordance with ACI 214 for standard cylinders, molded, cured and tested according to ASTM C-31 and C-39. 2. Acceptance: Conform to criteria for acceptance of concrete as per ACI 318.
1.5 SUBMITTALS:
A. Test Reports: Reports of concrete compression, yield, air content, and slump tests.
B. Shop Drawings: Submit for review wall forming drawings showing all concrete outlines, ledges, pockets and inserts.
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C. Certificates:
1. Material certificates: Provide materials certificates in lieu of materials laboratory test reports when permitted by Architect. Material certificates approval and certification by the NYSDOT for concrete aggregates will be accepted in lieu of laboratory tests. 2. Laboratory test reports: Submit laboratory test reports for concrete materials and mix design test as specified.
a. Dry weights of cement. b. Saturated surface-dried weights of fine and coarse aggregate. c. Quantities, type and name of admixtures. d. Weight of water.
3. Ready-mix delivery tickets: ASTM C-94.
D. Product Data: Submit manufacturer's product data with application and installation instructions for proprietary materials and items, including forming accessories, admixtures, patching compounds, waterstops, joint systems, curing compounds, dry-shake finish materials, and others as requested by Architect.
1.6 PRODUCT DELIVERY, STORAGE AND HANDLING:
A. Cement: Store in weathertight enclosures and protect against dampness, contamination and warehouse set.
B. Aggregates:
1. Stock pile to prevent excessive segregation or contamination with other material or other sizes of aggregates. 2. Use only one supply source for each aggregate stock pile.
C. Admixtures:
1. Store to prevent contamination, evaporation or damage. 2. Protect liquid admixtures from freezing or harmful temperature ranges. 3. Agitate emulsions prior to use.
1.7 ENVIRONMENTAL REQUIREMENTS:
A. Allowable Concrete Temperatures:
1. Cold weather: Maximum and minimum ASTM C94. 2. Hot weather: Maximum 90°F.
B. Do not place concrete during rain, sleet or snow unless protection is provided.
1.8 PROTECTION: Requirements for hot and cold weather concreting specified herein are minimum only and Contractor shall remain fully responsible to produce, place and cure concrete which has not been weakened or injured by frost, freezing or by incomplete protection during hot weather.
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1.9 COORDINATION:
A. Give ample opportunity and full cooperation to various trades and other Contractors to install their required embedded items. Suitable templates and/or instructions will be provided for setting items not placed by trades themselves.
B. Provide openings in concrete slabs for pipes and ducts where shown on drawings and/or for which instructions are given prior to placing concrete.
C. Embedded Items: Subject to inspection and approval by Architect before concrete is placed.
D. Fill openings, left in foundation walls for pipes, with concrete after pipes are in place.
PART_2_-_PRODUCTS
2.1 MATERIALS:
A. Portland Cement: ASTM C-150, Type I, unless otherwise acceptable to Architect.
B. Aggregates:
1. Fine aggregate: ASTM C-33 and NYSDOT approved except contain maximum of 2% by weight of following: Shale, schist, alkali, earth, loam, mica, coated grains, soft and flaky particles. No more than 4% clay by volume. 95% pass No. 4 Sieve, less than 3% pass No. 100 Sieve.
2. Coarse aggregate: (Normal weight concrete) crushed stone or gravel, ASTM C-33 and NYSDOT approved except as noted below:
a. Hard, strong, crystalline rock, free from shale or other soft materials, uncoated and clean. b. Crushed stone or gravel for plain concrete, pass 2 inch sieve, all retained on 1/4 inch sieve except maximum aggregate size shall conform to requirements specified herein based on concrete thickness and dimension between sides of forms.
3. Deleterious substance limits:
a. Footings, foundation walls, grade beams, interior floor slabs not exposed to weather: ASTM C-33, Class 3S. b. Concrete exposed to weather: ASTM C-33, Class 4S, and NYSDOT Specifications for paving concrete.
4. Coarse aggregate: (lightweight concrete)
a. Expanded slag, shale or clay: ASTM C-330.
(1) Produce aggregate by rotary kiln process. Quarry crush, screen raw materials to size and burn to incipient fusion in rotary kiln. Properly cool, then crush, screen and grade burned material. (2) Grade aggregate from 3/4 inch to No. 4 Sieve based on percentages indicated in Table No. 1 of ASTM C-330. (3) Test and receive approval from Architect when source of supply is established. Do not change source of supply without written approval from Architect. Clark Patterson Lee 03/27/2014
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5. Use only crushed limestone aggregate in all exterior concrete.
C. Water: Clean, free from oil, acid and injurious materials and amounts of vegetable matter, alkalis, and other salts. Drinkable.
D. Admixtures:
1. Water reducing admixture: The admixture shall conform to ASTM C-494, Type A and not contain more chloride ions than are present in municipal drinking water.
a. Euclid Chemical Co.: Eucon WR-75. b. Master Builders: Pozzolith 200N. c. Sika Chemical Corp.: Plastocrete 161. d. W.R. Grace & Co.: Daracem 55.
2. Water reducing, retarding admixture: The admixture shall conform to ASTM C-494, Type D and not contain more chloride ions than are present in municipal drinking water.
a. Euclid Chemical Co.: Eucon Retarder-75. b. Master Builders: Pozzolith 100XR. c. Sika Chemical Corp.: Plastiment.
3. Air entraining admixture: Conform to ASTM C-260. 4. Prohibited admixtures: Calcium chloride, thiocyanates or admixtures containing more than 0.05% chloride ions are NOT permitted. No admixture shall cause an increase in shrinkage when tested in accordance with ASTM C-494 and ASTM C-157.
E. Liquid Membrane Clear Curing and Sealing Compound (VOC Compliant): ASTM C-309, Type I, Class B. The compound shall have 30% solids content minimum, and will not yellow under ultraviolet light after 500 hours of test in accordance with ASTM C-4587 and will have test data from an independent testing laboratory indicating a maximum moisture loss of 0.039 grams per sq. cm. when applied at a coverage rate of 300 sq. ft. per gallon.
1. Euclid Chemical Co.: Super Diamond Clearvox. 2. Rainguard International; Floor-Lok Sealer Concentrate.
F. Non-Shrink Grout: Factory pre-mixed grout and shall conform to ASTM C-1107, standard specification for packaged dry, hydraulic-cement grout (non-shrink).
1. Euclid Chemical Co.: Euco NS. 2. Master Builders: Masterflow 713. 3. Sika Chemical Corp.: Sika Grout 212. 4. Sonneborn Building Products: Sonogrout 14K.
G. Expansion Joint Fillers:
1. For interior work: ASTM D-1752, Type II. 2. For exterior work: ASTM D-1751.
H. Concrete Forms Materials:
1. Wood or metal of adequate strength to meet design requirements for formwork required. Include materials for whalers, bracing and shoring. Clark Patterson Lee 03/27/2014
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2. Forms for exposed finish concrete: Unless otherwise indicated, construct formwork for exposed concrete surfaces with plywood, metal, metal-framed plywood faced or other acceptable panel-type materials, to provide continuous, straight, smooth, exposed surfaces. Furnish in largest practicable sizes to minimize number of joints and to conform to joint system shown on drawings or approved by Architect. Provide form material with sufficient thickness to withstand pressure of newly-placed concrete without bow or deflection. Earth forms are strictly prohibited. 3. Form ties:
a. For non-architectural concrete: 1/2 inch or 1 inch break, standard snap-ties. b. For architectural concrete: Snap-ties with 1" O.D. x 1-1/2" long setback plastic cones.
4. Form release agents and/or coatings:
a. Non-staining. b. Compatible with subsequent finishing and bonding procedures.
I. Bonding Agent: Equivalent to "Acryl 60" as manufactured by Standard Drywall Products or "Flexcon" by the Euclid Chemical Co.
J. Water Stops: Provide mastic water stops at all joints indicated.
1. Swell stop: As manufactured by Green Streak. 2. Lock stop: As manufactured by Green Streak.
K. Fiber Reinforcement: A macro-synthetic and fibrillated synthetic fiber blend specifically manufactured for use as a secondary concrete reinforcement. Volume per cubic yard of concrete shall be 5 lbs. per cu. yd. Macro fibers shall be 1.55 inches (minimum) in length, with a minimum tensile strength of 80 ksi. Fiber manufacturer must provide documentation indicating a minimum of five (5) years of satisfactory performance history to accompany product submittals. Fiber reinforcement shall conform to ASTM C-1116/C 1116M.
1. Propex Concrete Systems: Novomesh 950. 2. Forta Corp.: Forta-Ferro. 3. W.R. Grace & Co.: Strux 90/40.
2.2 Mixes:
A. Ready-Mix: ASTM C-94, except as otherwise specified.
B. Mix concrete only in quantities for immediate use.
C. Do not retemper or use concrete that has set or become air-slacked, lumpy or contaminated with foreign materials or chloride salts.
D. Mix Proportioning:
1. Produce concrete of specified quality, capable of being placed without excessive segregation and, when hardened, of developing characteristics required. 2. Specified properties: 28-day compressive strength of -
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a. 3000 psi minimum for footings and foundation walls:
(1) Minimum cement content: 470 lbs. per cu. yd. (2) Air content: 5% ± 1%. (3) Slump: 4 inches. (4) Maximum size of coarse aggregate normal weight for footings and foundations shall be 1 1/2 inches and shall not exceed 1/5 of narrowest dimension between sides of forms. Maximum size of coarse aggregate for slabs and walls shall not exceed a maximum of 3/4 inch. (5) Water reducing admixtures permitted. (6) Maximum W/C ratio 0.50
b. 4000 psi minimum for interior topping slabs on existing slabs on grade:
(1) Minimum cement content: 560 lbs. per cu. yd. (2) Air content: Non-air entrained at interior slabs. (3) Slump: 4 inches. (4) Maximum size of coarse aggregate, normal weight, shall be 3/8 inch and shall not exceed 1/5 of narrowest dimension between sides of forms. (5) Water reducing admixtures permitted. (6) Maximum W/C ratio 0.45
c. 4000 psi minimum for exposed to weather:
(1) Minimum cement content: 660 lbs. per cu. yd. (2) Air content: 6% ± 1% for concrete exposed to weather. (3) Slump: Max. 4 inches. (4) Water reducing admixtures permitted. (5) Coarse aggregate: Not to exceed 1/3 depth of slab or pads; maximum size of 3/4 inch. (6) Maximum W/C ratio: 0.40 (7) Use only crushed limestone aggregate in all exterior concrete.
d. 4000 psi minimum for lightweight concrete:
(1) Concrete supplier shall assume the responsibility for selection of properties to be submitted. (2) Provide proportions and ingredients to produce a mixture which can be satisfactorily placed and consolidated by methods to be employed. (3) Slump: Maximum 3 inches. (4) Portland cement content: Minimum 520 lbs. per cu. yd. (5) Maximum size ASTM C-330 aggregate not to exceed 3/8 inch. (6) Mix to produce concrete having unit weight of 110 pcf maximum.
E. Designing Mixes:
1. Prepare design mixes for each type and strength of concrete in accordance with applicable provisions of ASTM C-94. Use an independent testing facility acceptable to Architect for preparing and reporting proposed mix designs. The testing facility shall not be the same as used for field quality control testing unless otherwise acceptable to Architect. 2. Concrete supplier to assume responsibility for selection of proportions submitted. Cost of mix design to be paid by Contractor.
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3. Proportions of ingredients: Produce mixture which can be placed and consolidated by methods to be employed. 4. Determine proportions by one of the following methods:
Method_1: Whenever possible, use field test data for concrete made with similar ingredients to establish proportions which will meet the required average strength. Data should be of proven strength record; however, other data may be accepted at discretion of Architect.
Method_2: Verification of suitability of concrete producer's recommended proportions by qualified testing laboratory.
Method_3: In lieu of field test data or individual mix verification, proposed materials may be evaluated by series of trial mixes. Make at least 3 trial mixes at specified slumps ± 1/2 inch and air contents ± 1/2%, suitable for work with three (3) different cement contents. Choose cement contents to provide strengths at test age, normally 28 days, meeting those required for work. Cement content specified for various strengths of concrete is minimum. Plot curve from results of trial mixes showing relation between compressive strength and cement content. Select proportions based on average strength required as follows.
5. Required average strength:
a. Where supplier can establish uniformity of production for concrete of similar strength and materials based on recent test data, average strength used as basis for determining proportions to exceed design strength by at least:
400 psi if standard deviation is less than 300 psi. 550 psi if standard deviation is 300 to 400 psi. 700 psi if standard deviation is 400 to 500 psi. 900 psi if standard deviation is 500 to 600 psi.
b. If standard deviation exceeds 600 psi or no suitable record of performance is available, select proportions for average strength at least 1200 psi greater than design strength.
PART_3_-_EXECUTION
3.1 INSPECTION:
A. Assure that:
1. Excavation has been completed. 2. Formwork has been completed, properly set, braced, shored, and that ice, snow and excess water are removed. 3. Reinforcing is in place, properly tied and/or supported. 4. Specified base material has been installed to proper thickness, elevation, compaction. 5. Screeds, where required, are set in place at proper elevation. 6. Reinforcing and mixing/conveying equipment inner surfaces are clean, free of ice, snow, debris and other foreign coatings. 7. Form release agents and/or coatings are compatible with subsequent finishes and bonding procedures. 8. Conduits and piping are in place and other work to be embedded in fill has been installed, inspected and approved.
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B. Verify that expansion joint material, anchors, other embedded items are secured in position.
C. Verify that manufacturer's installation instructions are available at project site for products specified to be installed in accordance with such instructions.
D. Verify that ambient temperature is within allowable limits.
E. Verify that protection is afforded if placing during rain, sleet or snow.
F. Assure that vapor retarder has been properly installed.
G. Where wood is indicated to be permanently embedded in concrete, assure that it is properly located, braced and/or supported, and that material has been pressure-treated as specified in carpentry section of specifications.
H. Where railing inserts are indicated to be permanently embedded in concrete, assure that they are properly located, aligned, braced and/or supported as required. Cut through metal floor deck and anchor to structural steel where required by the drawings.
3.2 CONCRETE TESTS:
A. Refer to Section 01 45 23 - TESTING LABORATORY AND SPECIAL INSPECTION SERVICES for additional requirements pertaining to tests.
B. During progress of the work the General Contractor shall coordinate schedules with Owner's testing laboratory to allow testing lab person to make and cure compression test specimens as per ASTM C-31 as follows:
1. Not less than five (5) specimens [two (2) for 7-day, two (2) for 28-day tests and one (1) retained for future testing] for each test and not less than one (1) test for each 50 cu. yd. of concrete of each class or fraction thereof placed in one (1) day. 2. Cure specimens under laboratory conditions except that, when in opinion of Architect there is possibility of surrounding air temperature falling below 40°F., he may require additional specimens to be cured under job conditions. 3. Cylinder tags shall be filled in with mix proportions shown and date and location of pour. 4. Conduct in accordance with ASTM C-143 for each individual concrete batch or as frequently as required by Architect to assure that concrete is within specified slump. Conduct tests in presence of Architect or his representative. 5. Conduct entrained air tests in accordance with requirements of ASTM C-138, C-173, or C-231. Every hour and/or as frequently as required by Architect to assure concrete contains air content specified. Conduct tests in presence of Architect or his representative using same representative of Contractor for each test. 6. At end of each week, submit to Architect a record showing results of all slump and air tests made during previous week. Record shall indicate location in project where concrete was used. 7. Test cylinders shall be picked up and tested by Owner's testing laboratory.
3.3 TEST RESULTS:
A. The 7-day tests may be used provided relation between 7-day and 28-day strengths of concrete is established by tests for materials and proportions used. The standard age for cylinder tests is 28 days. Cylinders to be tested in accordance with ASTM C-39.
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B. If average strength of laboratory-cured field cylinders for any portion of structure falls below compressive strengths at 28 days as called for in specifications, or if any one test falls 500 psi below the specified strength, Architect may require concrete core tests in accordance with ASTM C-42, or order load tests to be made on portions of building so affected.
1. If Architect orders load tests, load in accordance with ACI 318, submit method of loading and test procedure in advance to Architect for his approval. If tested portion of structure does not meet requirements of test, remove and replace.
C. Laboratory furnish copies of all tests as follows:
Architect's Office - 1 copy Structural Engineer - 1 copy Concrete Contractor - 1 copy Project Inspector - 1 copy Concrete Supplier - 1 copy
3.4 FORMS AND CENTERING:
A. Construct forms, centering, cores and molds so finished concrete will conform to shapes, lines, grades and dimensions indicated, within tolerances listed.
B. Design forms to support concrete at time of placement, reinforcing, placement equipment and personnel involved during pouring and finishing operations. Provide leakproof joints. Include bracing and shoring required to prevent deflection and movement.
C. Slots, Chases, Recesses, Inserts, Keys and Temporary Openings:
1. Box out for slots, chases, recesses or openings shown on drawings and required by work of other trades. 2. Build bulkheads with keys in walls and footings for stopping concrete, using clean keys of reused or new chamfered 2 x 4's. 3. Box out for temporary openings such as shafts and pipe spaces and build forms to seal up when and as required. 4. Build into concrete all inserts, dovetail slots, anchors, PVC or metal reglets, ties, hangers, collars, sleeves, thimbles, sockets, nailing blocks, miscellaneous and ornamental iron required to secure work of other trades. Locate dovetail slots at all locations where masonry units butt concrete. 5. Allow sufficient time for investigation of reinforcing installation by Architect before installing inside form. 6. Coordinate wall control joints with masonry control joints.
D. Leave forms in place a minimum of 72 hours. Protect concrete from loss of water after forms are removed for a minimum of seven (7) days.
3.5 MIXING WATER CONTROL:
A. Concrete arriving at site with slump below that suitable for placement may be adjusted by addition of water to increase slump provided maximum slump and maximum water cement ratio is not exceeded. Follow any water addition by mixing of at least 30 revolutions of drum.
B. After initial adjustment to proper slump, no additional water should be added.
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C. Use entrained air admixture in accordance with manufacturer's instructions; insert at mixer.
3.6 INSTALLATION:
A. Preparation for Placing Concrete:
1. Notify Architect 24 hours in advance of beginning following stages of work:
a. Final grade for slab bearing. b. Pouring concrete footings, foundations or slabs.
2. Remove water from excavations or forms before placing concrete. Divert any water flow through proper side drains. Remove without washing over freshly placed concrete. 3. Provide runways or other means for wheeled equipment to convey concrete to deposit points. Do not wheel equipment used to deposit concrete over reinforcement. Do not support runways on reinforcement.
B. Placing Concrete:
1. Retempered concrete not allowed. 2. Do not use air-slaked or lumpy concrete. 3. Completely discharge contents of mixer before each new batch is loaded. 4. Convey concrete from mixer to final position by method preventing separation or loss of material. 5. Maximum height of concrete free fall: 4 feet. 6. Regulate rate of placement so concrete remains plastic and flows into position. 7. Deposit concrete in continuous operation until panel or section is completed. 8. Place concrete in horizontal layers 18 inches maximum thickness. 9. Place so as to prevent forming of cold and/or irregular joints. 10. Use vertical, plumb bulkheads at joints for ending days work and arrange at right angles to planes of stress and in areas of minimum shear. 11. Unacceptable honeycomb work, as determined by Architect, will be rejected. 12. Concrete slabs on ground:
a. Construct concrete floor slabs as indicated. Include all materials and forms required. b. Upon prepared base, place monolithic concrete slab, reinforced as indicated.
(1) Dampen subgrade, without free standing water. (2) Consolidate and level slabs with bullfloat or darby before any bleed water appears. (3) In general, place concrete in accordance with ACI 302, Paragraph 6.4 "Placing Concrete" with reference to discharge of ready-mix, job site transfer and placing on subgrade.
13. Structural concrete slabs on metal forms:
a. Where wheel type equipment is used for conveying concrete, provide adequate runways and supports for such equipment so as not to damage metal forms and/or reinforcing.
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b. Convey concrete from mixer to place of final deposit by methods which will prevent separation or loss of materials using conveying equipment capable of providing supply of concrete at site of placement without separation of ingredients and without interruptions sufficient to permit loss of plasticity between successive increments. c. Deposit concrete as nearly as practicable in its final position to avoid segregation due to handling or flowing. Proceed with concreting at rate that concrete is at all times plastic. d. Do not use concrete containing chloride salts. e. Consolidate concrete by suitable means during placement so as to provide full contact with reinforcing and/or with feature provided to accomplish composite design in metal forms.
14. Maximum spacing of control joints:
a. Slabs-on-Grade: 15 feet maximum dimension and 225 square feet maximum area between control joints. b. Walls: 60 foot length.
C. Consolidating Concrete:
1. In formwork, vibrate thoroughly to insure full contact with forms and reinforcement. 2. Use mechanical vibrating equipment for consolidation. 3. Vertically insert and remove hand-held vibrators at 18 inch maximum intervals in any direction. 4. Do not use vibrators to transport concrete in forms. 5. Minimum vibrator speed, 8000 RPM for hand-held vibrators. Use and type of vibrators shall conform to ACI 309, "Recommended Practice For Consolidation of Concrete". 6. Vibrate concrete minimum amount required for consolidation. Use and type of vibrator shall conform to ACI 309 "Recommended Practice for Consolidation of Concrete".
D. Construction Joints and Stoppages:
1. Make construction joints and stoppages at locations that will least impair strength of structure. 2. Provide keying and supplementary reinforcement at each construction joint and stoppage. 3. Before pouring next section:
a. Clean exposed reinforcement. b. Clean and roughen surface of concrete and remove laitance. c. Wet joint surfaces and flush with neat cement grout.
E. Patching Concrete:
1. After removal of forms, patch holes, including those at form ties, unacceptable honeycombing and other voids in surfaces.
a. Remove fins and other projections on exposed surfaces. b. Assure surfaces to receive patching are clean, free of scaling, oil, grease, dirt, dust, efflorescence, spalling and adverse form treatments affecting bond of patching mortar.
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c. Within seven (7) days after pouring concrete, wet surfaces to be patched and patch with stiff mortar consisting of one (1) part portland cement to two (2) parts sand passing #30 sieve. Permit patching grout, before use, to set 20 to 30 minutes and retemper without adding additional water. If patching work extends more than seven (7) days after pouring concrete, apply the specified bonding agent and patch with stiff mortar consisting of one (1) part portland cement, two (2) parts sand passing #30 sieve and liquid consisting of one (1) part bonding agent to three (3) parts of clean water. Apply bonding agent and observe maximum time for placement as recommended by manufacturer. d. Compact mortar into place and screed off slightly higher than adjacent work, finish flush after initial set.
2. Work that cannot, in opinion of Architect, be properly patched, will be rejected.
F. Finishing:
1. General:
a. Do not conduct finishing operations while free water stands on surface. b. Do not use dusting of cement, sand or cement-sand mixture to absorb free water on surface. c. Power finishing tools may be used except, hand finish areas adjacent to vertical surfaces, electrical fittings, pipes and areas inaccessible to power finishing tools. d. If spalling occurs in surface, remove slab and replace at Contractor's expense. Patching surface of slabs after initial set will not be accepted.
2. Formed concrete:
a. Tops of forms:
(1) Strike concrete smooth at tops of forms. (2) Float to texture comparable to formed surfaces.
b. Formed surfaces:
(1) Concrete surfaces not exposed to view: As-cast finish except for patching requirements. (2) Patch tie holes and defects, as specified, after form removal. (3) Remove fins from surfaces exposed to view and/or subsequent finishes or treatments. (4) Within seven (7) days after concrete is poured and after patching, rub interior and exterior exposed vertical surfaces to uniform finish with abrasive carborundum stone.
3. Flat work: (Normal weight concrete) screed, darby, or bullfloat, edge, joint, float and trowel in accordance with ACI 302. Finishing includes, but is not limited to:
a. Preliminary finish for flat work:
(1) Bring concrete to correct level and at proper times, screed, darby or bullfloat. (2) Complete screeding before any excess moisture or bleed water appears on surface. As screeding progresses, drive grade stakes down flush with subgrade or remove in time to avoid walking on screed concrete. Clark Patterson Lee 03/27/2014
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(3) Immediately follow screeding with darbying or bullfloating, eliminating ridges and filling voids left by screed. Complete operation before excess moisture or bleed water appears on surface. (4) Do not perform any subsequent operations until concrete will sustain foot pressure with maximum 1/4 inch indentation.
b. Subsequent finishing operations:
(1) Finish where indicated or specified in Division 2, with approved edging tool producing a 1/4 inch round edge. (2) Do not perform edging or jointing operations until bleed water and excess moisture have left or been removed from surface. Provide true, straight edges or grooves. (3) Where construction joints are indicated or specified:
(a) In slabs not scheduled to receive subsequent finish material, tool butted top edges of each adjacent slab with edging tool. Remove edging tool marks on surface of slab by floating and troweling. After minimum of 28 days, fill joints with traffic bearing sealant. (b) In slabs scheduled to receive finish material, butt slabs and leave square edges on each adjacent slab.
(4) Floating:
(a) When water sheen disappears from surface and concrete will support a man, and after edging and jointing operations where required, perform floating operation using approved magnesium hand or machine floating equipment. (b) Where edging is indicated, rerun edging tool after floating.
(5) Troweling:
(a) Immediately following floating, steel trowel surface keeping trowel blade as flat against surface as possible, providing a smooth surface free of "washboard" or "chatter". (b) Steel trowel slabs a second time, at proper time, for dense hard surface, except where broom finish is scheduled.
(6) Provide broom finish, applied after first troweling operation where indicated or specified in Division 2. (7) Where edging is indicated, rerun edging tool after troweling or broom finish.
4. Flat work: (lightweight structural concrete)
a. Execute screeding, darbying or bullfloating, floating and troweling in accordance with paragraph pertaining to "Finishing Lightweight Structural Concrete", ACI 302-1R.
G. Protection and Curing: Includes, but is not limited to:
1. Heating materials:
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2. Providing proper enclosures and maintaining temperature of enclosure at minimum 50°F. for seven (7) days. 3. Providing adequate protection during hot weather against rapid drying and cold joints. 4. Do not use accelerating, retarding or anti-freeze admixtures or additives. 5. Prevent use of interior and exterior concrete slabs for a period of seven days after installation.
H. Cold Weather Concreting:
1. Conform to ACI Standard 306 when concreting at or below a temperature of 40°F., or whenever atmospheric temperatures will probably fall below this limit within the next 24 hours after placing concrete.
I. Hot Weather Concreting: ACI 305.
1. Hot weather, for purposes of this specification, is defined as 80°F. and rising, or 85°F. and falling.
J. Curing: ACI 308.
1. Protect concrete against loss of moisture, rapid drying or temperature changes, mechanical injury or injury from rain, ice, snow or flowing water for a period of seven (7) days. Maintain concrete above 50°F. and in a moist condition during curing period. 2. All interior slabs shall be water cured conforming to ACI 308. Curing by application of the specified curing and sealing compound, dissipating resin type compound or by application of waterproof sheet materials conforming to ASTM C-171-80 may be used when approved by Architect. 3. All exposed interior slabs and troweled slabs receiving mastic applied adhesives or "shake-on" hardeners shall be cured in strict accordance with manufacturer’s written instructions. 4. Exterior slabs, sidewalks, curbs, and architectural concrete shall be cured with the specified clear, non-yellowing curing and sealing compound.
5. Any curing compound used on floor slabs receiving applied finish flooring shall be guaranteed by the manufacturer, in writing, not to impair bonding of adhesive. 6. Water cure all slabs which are to receive terrazzo, bonded cementitious materials, epoxy or urethane coatings, liquid floor hardener, or waterproofing. A curing treatment of moisture retaining covers or a dissipating resin curing compound conforming to ASTM C-309 Type A may be used when approved by Architect. The dissipating resin curing compound must chemically break down in approximately an 8 week period after application. 7. Water cure all concrete scheduled to receive painted finish. 8. Contractor shall properly cure and take precautions as necessary to prevent curling of concrete slabs.
a. Reapply specified curing and sealing compound to control joints immediately after joints are cut and swept clean. b. If curling occurs, the Contractor shall make corrections by method approved by Architect at no extra cost.
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K. Waterstops:
1. Install mastic waterstops on surfaces indicated free from dirt and loose particles. Concrete surface must be dry and have cured a minimum of 24 hours. 2. Apply all primers/adhesives and waterstops in accordance with manufacturer's requirements.
3.7 CLEAN UP:
A. Immediately remove stains and spillage from paved and finished surfaces. B. Remove excess materials, forms and debris from project site.
END_OF_SECTION
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 CONCRETE REINFORCING 035440 - 1
SECTION 032000 - CONCRETE REINFORCING
PART_1_-_GENERAL
1.1 RELATED DOCUMENTS:
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this section.
1.2 SUMMARY:
A. Extent of concrete reinforcing steel is indicated on drawings and in provisions of this section.
B. Concrete reinforcing shall include but is not necessarily limited to the following:
1. Furnish all equipment, labor, material, and devices to complete all work as specified herein, and/or as required by the contract drawings. 2. Reinforcing bars and mesh for footings, walls, piers, and slabs on grade. 3. Reinforcing accessories and supports.
1.3 RELATED WORK:
A. Cast-In-Place_Concrete is specified in another Division 3 section.
1.4 QUALITY ASSURANCE:
A. Use latest edition, including all addenda, revisions and supplements for all specifications, standards and codes referred to herein.
B. Applicable Standards:
1. American Society for Testing Materials:
Specification for Cold-Drawn Steel Wire for Concrete Reinforcement - ASTM A-82.
Specification for Fabricated Steel Bar or Rod Mats for Concrete - ASTM A-184.
Specification for Welded Steel Wire Fabric for Concrete Reinforcement - ASTM A-185.
Specification for Deformed Billet Steel Bars for Concrete Reinforcement With 60,000 PSI Minimum Yield Strength - ASTM A-615.
2. American Concrete Institute:
ACI 318 Building Code Requirements for Reinforcing Concrete.
1.5 SHOP DRAWINGS: Submit setting plans and fabrication details for all concrete reinforcing steel. Shop drawings shall include elevations of all walls showing and dimensioning concrete outlines, ledges for brick or floor slabs, beam and column pockets. Openings and any other details which affect the detailing and placing of the reinforcing shall be shown on the shop drawings.
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1.6 DELIVERY, STORAGE AND HANDLING:
A. Store in designated areas only.
B. Handle and store in a manner to prevent unscheduled bending.
C. Keep free of dirt, mortar, oil, and any other materials that would reduce the bonding capability with concrete.
PART_2_-_PRODUCTS
2.1 MATERIALS:
A. Reinforcing Bars: Deformed reinforcing steel 60,000 psi yield, to conform to ASTM Standards A-615 GR60.
B. Reinforcing Mesh: Welded wire fabric or cold drawn wire shall conform to ASTM Standards A- 82 and A-185. Size and spacing as noted on drawings. Provide flat sheets only.
C. Reinforcing Steel Supports: Spacers, chairs, bolsters, ties, and other devices necessary for proper placing, spacing, supporting, and fastening reinforcement in place. Legs of support bars exposed in finished concrete surfaces shall be galvanized or plastic tipped. Spacers, chairs, and supporting devices shall conform to the design required for the CRSI.
2.2 FABRICATION:
A. Splices and Offsets in Reinforcement: Unless specifically indicated, splices of reinforcement at points of maximum stress shall be avoided. Splices shall provide sufficient lap to transfer the stress between bars by bond and shear.
B. All concrete reinforcing shall be detailed in accordance with the requirements of CRSI Manual of Standard Practice (MSP-1-90).
PART_3_-_EXECUTION
3.1 INSPECTION: Erector must examine areas and conditions under which concrete reinforcement is to be installed and notify Contractor in writing of conditions detrimental to proper and timely completion of work. Do not proceed with work until unsatisfactory conditions have been corrected in a manner acceptable to erector.
3.2 PLACING REINFORCING:
A. Comply with Concrete Reinforcing Steel Institute's recommended practice for "Placing Reinforcing Bars", for details and methods of reinforcement placement and supports, and as herein specified.
B. Clean reinforcement of loose rust and mill scale, earth, ice and other materials which reduce or destroy bond with concrete.
C. Accurately position, support and secure reinforcement against displacement by formwork, construction, or concrete placement operations. Locate and support reinforcing by metal chairs, runners, bolsters, spacers, and hangers, as required.
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D. Place reinforcement to obtain at least minimum coverages for concrete protection. Arrange, space and securely tie bars and bar supports to hold reinforcement in position during concrete placement operations. Set wire ties so ends are directed into concrete, not toward exposed concrete surfaces.
E. Install welded wire fabric in as long lengths as practicable. Lap adjoining pieces at least one full mesh and lace splices with wire. Offset end laps in adjacent widths to prevent continuous laps in either direction. Provide sheet mesh in structural concrete slabs and toppings.
END_OF_SECTION
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 CONCRETE WALKS AND CURBS 033016 - 1
SECTION 033016 – CONCRETE WALKS AND CURBS
PART_1_-_GENERAL
1.1 RELATED DOCUMENTS:
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this section.
1.2 SUMMARY: Extent of concrete walks and curbs is indicated on drawings and in provisions of this section.
1.3 RELATED WORK SPECIFIED ELSEWHERE:
A. EXCAVATING, FILLING AND GRADING - Division 31 C. ASPHALT CONCRETE PAVING - Division 32
1.4 QUALITY ASSURANCE:
A. Reference Standards: Latest edition of all standards, specifications and codes referred to below, including all addenda, revisions and supplements thereto, govern work under this section:
1.4 A - ADD AND DELETE STDS. AS APPL., COORD. WITH PART 2.
1. American Society for Testing and Materials (ASTM):
a. ASTM A-185, welded steel wire fabric for concrete reinforcement.
b. ASTM A-615, deformed and plain billet steel bars for concrete reinforcement.
c. ASTM C-33, concrete aggregates.
d. ASTM C-94, ready-mix concrete.
e. ASTM C-150, Portland cement.
f. ASTM C-171, sheet materials for curing concrete.
g. ASTM C-260, air-entraining admixtures for concrete.
h. ASTM C-309, liquid membrane forming compounds for curing concrete.
i. ASTM C-494, chemical admixtures for concrete.
j. ASTM D-1751, pre-formed expansion joint fillers for concrete paving and structural construction (non-extruding and resilient bituminous types).
2. Concrete Reinforcing Steel Institute (CRSI):
a. Placing reinforcing bars.
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B. Regulatory Agencies: Conform to applicable requirements of local, state and federal codes and regulations.
C. Allowable Tolerances:
1. Flatwork: True to plane 1/8 inch in ten feet. 2. Vertical faces: Longitudinal axis, 1/4 inch in ten feet.
1.5 SUBMITTALS:
A. Shop Drawings:
B. Samples: 20 lbs. of following:
1. Coarse aggregate. 2. Fine aggregate. 3. Each type of cement used.
C. Test Reports:
1. Concrete: Compression, yield, air content and slump - ASTM C-94. 2. Coarse aggregate: ASTM C-33.
D. Certificates:
1. Manufacturer's certification that materials meet specification requirements.
2. Material content per cubic yard of each class of concrete furnished:
a. Dry weights of cement. b. Saturated surface-dried weights of fine and course aggregates. c. Quantities, type and name of admixtures. d. Weight of water.
3. Ready mix concrete delivery tickets, ASTM C-94.
1.6 PRODUCT DELIVERY, STORAGE AND HANDLING:
A. Ready Mix Concrete: ASTM C-94.
B. Forms: Store in area protected from weather, above grade and adequately ventilated. Handle to prevent damage.
1.7 ENVIRONMENTAL REQUIREMENTS:
A. Allowable Concrete Temperatures:
1. Cold weather: Maximum and minimum, ASTM C-94. 2. Hot weather: Maximum concrete temperature 90 degrees F.
B. Do not place concrete during rain, sleet or snow.
1.8 PROTECTION:
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A. Protect completed concrete work from pedestrian and vehicular traffic for minimum of 7 days.
B. Protect concrete from mechanical disturbances, water flow, loading, shock and vibration during curing period.
PART_2_-_PRODUCTS
2.1 MATERIALS:
A. Forms: Metal or wood, straight and free of distortion and defects, of size and strength to resist movement during concrete placement and retain horizontal and vertical alignment until removal. Coat forms with nonstaining, clear form-release agent not causing discoloration or disfigurement of concrete surface. Use flexible spring steel or laminated wood forms for curved surfaces.
B. Expansion Joint Filler: ASTM D-1751.
C. Reinforcing Steel: ASTM A-615, Grade 60.
D. Reinforcing Wire Fabric: ASTM A-185, furnish in flat sheets unless otherwise approved by Architect.
E. Curing Material: ASTM C-171, regular waterproof paper, white waterproof paper, clear polyethylene film, white opaque polyethylene film, or white burlap polyethylene sheet.
F. Curing Material: Liquid membrane, ASTM C-309, Type ID, Class B; except that water loss shall not exceed 0.04 grams per square cm. in 72 hours.
G. Ready-Mix Concrete: ASTM C-94.
1. Cement: ASTM C-150, Type II.
2. Admixtures:
a. Air entraining: ASTM C-260. b. Water reducing: ASTM C-494, Type A.
3. Fine aggregate: ASTM C-33 except as noted below. Contain maximum of 2% by weight of the following: Shale, shist, alkali, earth, loam, mica, coated grains, soft and flaky particles. No more than 4% clay by volume. 95% passing No. 4 Sieve, less than 3% passing No. 100 Sieve.
4. Coarse aggregate: Crushed stone or gravel, ASTM C-33 except as noted below:
a. Hard, strong, crystalline rock, free from shale, or other soft materials, uncoated and clean.
b. Deleterious substance limits: Conform to ASTM C-33 Class Designation 4S.
5. Water: Clean, free from oil, acid, and injurious materials, and amounts of vegetable matter, alkalis and other salts.
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2.2 MIXES: ASTM C-94, do not use retempered or set concrete.
A. Mix concrete only in quantities necessary for immediate use.
B. Do not retemper or use concrete that has set or become air-flaked, lumpy or contaminated with foreign materials or chloride salts.
C. Mix Proportioning:
1. Produce concrete or specified quality, capable of being placed without excessive segregation and, when hardened, of developing characteristics required.
2. Specified properties:
a. 28-day compressive strength of 4000 psi. b. Minimum cement content: 7 bags per cu. yd. c. Air content: 6% plus or minus 1.5% d. Water reducing admixture permitted. e. Coarse aggregate size: No. 2. f. Maximum W/C ratio: 0.45. g. Slump: Maximum 4 inches.
PART_3_-_EXECUTION
3.1 INSPECTION:
A. Verify that all subsurface work is completed.
B. Verify that earthwork is completed to correct line and grade, and that subgrade is smooth, compacted, and free of frost and excess water.
C. Verify that work to be built into concrete, and forms for openings and recesses to accommodate work of other trades, are at indicated location and grade.
D. Do not proceed with installation until unsatisfactory conditions are corrected.
3.2 FORMWORK:
A. Set forms to line and grade, rigidly braced and secured.
B. Install sufficient quantity of forms to allow continuous progress of work, and to permit retention of forms in place for a minimum of 24 hours after concrete placement.
C. Clean forms after each use. Coat with form release agent as often as required to produce proper separation from concrete.
3.3 SUBGRADE PREPARATION: Moisten subgrade thoroughly and uniformly; avoid any accumulation of standing water.
A. Adjust elevation of valve boxes, curb boxes, hand holes and other access facilities for underground utilities to meet finished walk grade.
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3.4 JOINTS:
A. Expansion Joints:
1. Spacing: Maximum 30 ft. O.C. unless otherwise indicated. 2. Place expansion joint filler for full depth of joint, flush with top surface of concrete.
B. Construction and Contraction Joints:
1. Spacing: Place construction or contraction joints midway between expansion joints in walks and straight curbs. Place contraction joints at intervals equivalent to 20% of radius of curve, minimum interval: 3 ft.
2. Construction joints: Place at end of pours and where placement operations are stopped for a period of 30 minutes or more, except where pours terminate at expansion joints.
3. Contraction joints: Form by tooling and edging or insertion of steel templates or division plates in plastic concrete; or, upon approval of Architect, saw cutting hardened concrete when surface will not be damaged by cutting.
3.5 REINFORCEMENT:
A. Cleaning: Remove dirt, grease, oil, loose mill scale, excessive rust and foreign matter reducing bond with concrete.
B. Placement:
1. Place and hold reinforcement in indicated position prior to placing concrete. Do not attempt to alter position or reinforcement after concrete placement.
2. Bar supports: CRSI 65.
3. Reinforcing bars: CRSI 63.
4. Place wire fabric in mats of largest practical dimensions.
C. Splices:
1. Tie lap splices securely with wire to prevent displacement during concrete placement.
2. Lap adjoining pieces one full mesh dimension minimum, offset end laps in adjacent mats to prevent continuous laps.
3.6 PLACING CONCRETE:
A. Convey concrete from mixer to final position by method preventing separation or loss of material.
B. Maximum Height of Concrete Free Fall: 3 ft.
C. Regulate rate of placement so concrete remains plastic and flows into position.
D. Deposit concrete in continuous operation until panel or section is completed.
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3.7 FINISHING CONCRETE:
A. Strike concrete smooth at top of forms immediately after placement.
B. Bull float or darby concrete walks and gutters to uniform surface before appearance of bleed water.
C. Allow bleed water to disappear before continuing finishing. Do not work concrete while bleed water stands on surface. Do not remove bleed water. Do not apply any material to absorb bleed water.
D. Finishing Curbs:
1. Edge top surface round front arris to require radius. 2. Magnesium float surface. 3. Re-edge. 4. Rub exposed vertical face after removal of forms.
E. Walks:
1. Magnesium float surface.
2. Score walks, to minimum depth of 1/2 inch, in pattern indicated on drawings.
3. Tool slabs with 2" wide edger at slab edges, expansion and contraction joints and at all slab scoring.
4. Steel trowel surface.
5. Broom surface. Use fine broom for level areas, coarse broom for inclines.
6. Re-edge slabs.
3.8 CURING:
A. Keep concrete moist by application of specified curing material immediately after completion of finishing.
1. Apply material in 2 coats, conforming to manufacturer's directions on rates and times of application for anti-spalling treatment.
2. Maintain curing material in full contact with concrete surface, with wet sand, straw or other means approved by Architect, for duration of curing period.
B. Maintain concrete between 50 and 90 degrees F. during curing period.
C. Curing Period: Minimum of 7 days.
3.10 CLEAN UP:
A. Immediately remove spills and stains from paved and finished surface areas.
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B. Remove excess materials, forms and debris from project site. C. Remove signs and barricades upon completion of curing period.
END_OF_SECTION
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 GYPSUM CONCRETE UNDERLAYMENT 035400 - 1
SECTION 035400 - GYPSUM CONCRETE UNDERLAYMENT
PART 1 GENERAL
1.1 RELATED DOCUMENTS:
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this section.
1.2 SUMMARY:
A. Extent of Gypsum Concrete Underlayment work is indicated on drawings and in provisions of this section.
B. Gypsum Concrete Underlayment work includes, but is not limited to:
1. Gypsum Concrete 2. Floor Primer 3. Overspray
1.3 REFERENCES
A. Underwriters Laboratory Fire Resistance Volume 1 www.ul.com
B. ASTM E336 and E1007 Field Sound Transmission Class (F-STC), Field Impact Insulation Class (F-IIC)
C. ASTM E90 and E492 Sound Transmission Class (STC), Impact Insulation Class (IIC)
D. GREENGUARD Certified Air Quality Sciences GREENGUARD Indoor Air Quality Certified®, GREENGUARD Children & Schools CertifiedSM, and GREENGUARD Select CertifiedSM www.greenguard.org
E. ASTM C472M Compressive strength of gypsum concrete
F. ASTM F2170 Standard Test Method for Determining Relative Humidity in Concrete Floor Slab
G. ASTM C578 Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation
H. ASTM F2419 Standard Test Method for Installation of Thick Poured Gypsum Concrete and Preparation of Surface to Receive Resilient Flooring
I. ASTM F2678 Standard Practice for Preparing Panel Underlayments, Thick Poured Gypsum Concrete Underlayments, Thick Poured Lightweight Cellular Concrete Underlayments, and Concrete Subfloors with Underlayment Patching Compounds to Receive Resilient Flooring
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J. TCNA F 180 Tile Council of North America Installation Handbook www.tileusa.com
K. NWFA National Wood Flooring Association Instructions www.nwfa.org
1.4 SUBMITTALS
A. Product Data: Submit manufacturer’s technical data, MSDS, and installation instructions.
1.5 SYSTEM REQUIREMENTS
A. Performance Requirements:
1. Gypsum Concrete Floor Underlayment a. Compressive strength 3000 psi (20.7 MPa), minimum. b. Density 115 pounds per cubic foot (1,840 kg/m3).
1.6 QUALITY ASSURANCE
A. Performance Standards:
1. All materials, unless otherwise indicated, shall be manufactured by a single source and shall be installed in accordance with its current printed directions and by a Manufacturer’s Authorized Applicator. 2. Underlayment mix shall be tested for a slump using a 2" (i.d.) x 4" (50 mm x 101 mm) cylinder resulting in a patty size of 8 (203mm) inches plus or minus 1 inch (25mm) diameter. 3. Compressive strength tested in accordance with ASTM C 472M.
1.7 DELIVERY, STORAGE AND HANDLING
A. All materials shall be delivered in their original unopened packages and protected from damage and exposure from the elements. Damaged or deteriorated materials shall be removed from the premises.
1.8 PROJECT CONDITIONS
A. Before, during and after installation of product, building interior shall be enclosed, with adequate ventilation and heat maintained at a temperature above 50° F (10°C) to allow for drying of product.
PART 2 GENERAL
2.1 MANUFACTURER: Gypsum Concrete Underlayment specified herein are product of Maxxon Corporation. Products of the following manufacturers, subject to compliance with requirements, will be acceptable:
A. Maxxon Corporation.
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2.2 MATERIALS
A. Products/systems: Gypsum concrete underlayment and topping products, including the following:
1. Dura-Cap Underlayment.
B. Floor Primer:
1. Material Standard: Comply with specifications outlined in manufacturer's Design and Installation Guide for wood. 2. Maxxon Floor Primer.
C. Mix Water:
1. Material Standard: Potable, free from impurities and from a domestic source.
D. Sand Aggregate:
1. Sand shall meet Maxxon Sand Specification 101.
E. Foam:
1. Extruded polystyrene with a minimum density of 1.6 pcf (25.6 kg/m³) [Type IV] or expanded polystyrene with a minimum density of 1.8 pcf (8.8 kg/m³) [Type IX]. Both types of insulation must meet ASTM C578. The polystyrene board must have 1.5 inch (38 mm), minimum diameter holes 12 inches (305 mm) on center, maximum in all directions for support pedestals.
F. Overspray Primer Sealer:
1. Seal all areas that receive glue down floor goods with Maxxon Overspray according to manufacturer's specifications.
G. Acrylic Primer Sealer (Alternate to Overspray):
1. Seal all areas that receive glue down floor goods with Maxxon Acrylic according to manufacturer’s specifications.
H. Set Modifier:
1. Maxxon set modifier can be used in the first lift to accelerate the set-time.
PART 3 EXECUTION
3.1 EXAMINATION
A. Site Verification of Conditions:
1. Installation shall not begin until the building is enclosed, including roof, windows, doors, and any other apertures. 2. Substrate shall be structurally sound, properly fastened, and dry. Contractor shall clean subfloor to remove mud, oil, grease, and other contaminating factors before arrival of the authorized applicator.
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3.2 REQUIREMENTS
A. Leak Prevention:
1. Fill cracks and voids in subfloor where leakage of slurry could occur.
B. Fasten the Polystyrene to Subfloor:
1. Polystyrene insulation is to be fastened down by mechanical fasteners, adhesives, or Gypsum Concrete slurry.
C. Priming EPS foam:
1. Prime the polystyrene using Floor Primer.
D. Application:
1. Install in accordance with reference standards and manufacturer's instructions.
3.3 GENERAL INSTALLATION REQUIREMENTS
A. Application:
1. Place Gypsum Concrete Underlayment at 1 inch (25 mm) minimum over polystyrene. Provide 1.5 inch (38 mm) minimum diameter holes in the polystyrene at 12 inches (305 mm) on center maximum in all directions for support pedestals. Spread and screed Gypsum Concrete Underlayment to a smooth surface. Except at authorized joints place Gypsum Concrete Underlayment as continuously as possible until application is complete so that no Gypsum Concrete Underlayment slurry is placed against Gypsum Concrete Underlayment product that has obtained its initial set.
B. Mixing Proportions:
1. General Requirements: Mix proportions and methods shall be in strict accordance with product manufacturer recommendations.
C. Drying:
1. The general contractor must provide and maintain correct environmental conditions to keep the building clean and dry, and protect against intrusion of moisture from any source. The general contractor must supply mechanical ventilation and heat if necessary to remove moisture from the area until the Gypsum Concrete Underlayment is dry. 2. Protection from Heavy Loads: During construction, place temporary wood planking over Gypsum Concrete Underlayment wherever it will be subject to heavy wheeled or concentrated loads.
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3.4 PREPARATION FOR INSTALLATION OF GLUE DOWN FLOOR GOODS
A. Sealing:
1. Seal all areas that receive glue down floor goods with Overspray or Acrylic according to the manufacturer’s specifications. Any floor areas where the surface has been damaged shall be cleaned and sealed regardless of floor covering to be used. Where floor goods manufacturers require special adhesive or installation systems, their requirements supersede these recommendations.
B. Moisture Testing:
1. ASTM F2170 Test Method for Determining Relative Humidity in Concrete. Follow the respective floor goods manufacturers’ recommendations for relative humidity requirements. When manufacturer does not have a relative humidity requirement, refer to Gypsum Concrete Underlayment manufacturer’s Procedures for Attaching Finished Floor Goods to Underlayments brochure.
C. Finished Floor Goods:
1. There are many reference standards for the installation procedures and recommendations for finished flooring applications over gypsum underlayments. These include instructions of the manufacturers of the finished flooring, adhesives and thin-set as well as national agency reference standards. The national standards are listed below:
Flooring Type Reference Standard Resilient ASTM F2419 Ceramic Tile TCNA F180 Wood NWFA Instructions
See manufacturer’s Procedures for Attaching Finished Floor Goods to Underlayments brochure for guidelines for installing finished floor goods.
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 GYPSUM CONCRETE UNDERLAYMENT 035400 - 6
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 CEMENTITIOUS UNDERLAYMENT 035440 - 1
SECTION 035440 - CEMENTITIOUS UNDERLAYMENT
PART_1_-_GENERAL
1.1 RELATED DOCUMENTS:
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this section.
1.2 SUMMARY:
A. Extent of cementitious underlayment is indicated and scheduled on drawings and in provisions of this section.
1. Self-drying, feather finish, cement based underlayment.
1.3 SUBMITTALS:
A. Product Data: Submit manufacturer’s literature describing products and methods of mixing and application instructions.
B. Certificates: Submit test reports certified by an independent testing laboratory stating that materials and mix intended to be used meet specified requirements.
1.4 QUALITY ASSURANCE:
A. Cementitious Underlayment Supplier: Regularly engaged in production of cement based and gypsum based underlayment.
B. Cementitious Underlayment Applicator: Regularly engaged and properly equipped for application of cementitious underlayment and as acceptable by aggregate producer.
C. Applicator to use mixing equipment and tools approved by cementitious underlayment manufacturer.
D. Self-drying, feather finish, cement based underlayment:
1. Underlayment shall be able to be installed from a true featheredge to ½” thick over large areas and to any thickness in well-defined areas such as filling holes or gouges and for making ramps. 2. Underlayment shall not require that the substrate be primed. 3. Underlayment shall be able to be covered by most finish flooring materials as soon as the surface hardens (usually within 1 hour). 4. Underlayment shall not require the addition of latex or any additive other than potable water.
1.5 DELIVERY, STORAGE AND HANDLING:
A. Deliver materials in manufacturer’s original undamaged packages or acceptable bulk containers.
B. Store packaged materials to protect them from elements, extreme temperatures or physical damage.
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 CEMENTITIOUS UNDERLAYMENT 035440 - 2
C. Remove damaged and/or defaced materials from project site. Replace with acceptable material.
1.6 SITE CONDITIONS:
A. Cement Based Underlayment:
1. Observe the basic rules of concrete work. Do not install below 50˚F surface temperature. Install quickly if floor is warm and follow manufacturer's hot weather precautions.
PART_2_-_PRODUCTS
2.1 MANUFACTURER: Products of the following manufacturers, subject to compliance with requirements, will be acceptable:
A. Ardex Inc.
2.2 MATERIALS:
A. Cement Based Underlayment: Ardex SD-F Feather Finish.
1. Underlayment develops a compressive strength of 4200 psi when tested in accordance with ASTM C109/mod. (Air-cure only).
B. Mix Water: Clean, potable and sufficiently cool (not warmer than 70˚F.
2.3 MIX DESIGNS:
A. Mix proportions and methods shall be in strict accordance with product manufacturer’s recommendations.
B. Cement Based Underlayment:
1. Mix Ardex SD-F powder with water to the desired trowelable consistency. The recommended mixing ratio is 2 parts powder to 1 part water by volume.
PART_3_-_EXECUTION
3.1 PREPARATION:
A. All subfloors, regardless of material, must be solid, sound and thoroughly cleaned.
B. Concrete floors must be clean and free of oil, grease, dirt, curing compounds and other contaminating factors before installation of underlayment. Mechanically clean if necessary.
C. Wooden subfloors must be clean and free of all foreign matter.
D. Subfloors shall be inspected and corrected for moisture or any other condition which could affect the performance of the underlayment or finished floor covering.
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 CEMENTITIOUS UNDERLAYMENT 035440 - 3
3.2 INSTALLATION:
A. Cement Based Underlayment:
1. Apply a minimum of two (2) skim coats of underlayment to achieve a smooth flat surface, ready to receive new flooring. 2. Apply Ardex SD-F to the prepared subfloor with a steel trowel using sufficient pressure to achieve the desired thickness and to provide a perfect featheredge, where necessary. 3. Install underlayment from a true featheredge up to a maximum thickness of ½ inch or as required to fill in low spots to make subfloor smooth and level. 4. Allow underlayment to dry sufficiently prior to flooring application. Typically, times range from 15 minutes to 1 hour depending upon ambient conditions.
3.3 PATCHING:
A. Patch any cracks that are formed in underlayment as recommended by manufacturer prior to flooring application.
3.4 PROTECTION:
A. Prior to the installation of the finish flooring, the surface of the underlayment should be protect from abuse by the use of plywood, Masonite or other suitable protection course. Remove as installation of finish floor progresses.
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 REPAIR MORTAR 039250 - 1
SECTION 039250 - REPAIR MORTAR
PART_1_-_GENERAL
1.1 RELATED DOCUMENTS:
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this section.
1.2 SUMMARY:
A. Extent of repair mortar is indicated and scheduled on drawings and in provisions of this section.
1.3 REFERENCES:
A. ASTM C 109, Standard Compressive Strength of Hydraulic Cement Mortars
B. ASTM C 293, Flexural Strength of Concrete
C. ASTM C 469, Static Modulus of Elasticity and Poisson's Ratio of Concrete in Compression
D. ASTM D 4541, Pull-Off Strength of Coatings Using Portable Adhesion Testers
E. ASTM C 496, Splitting Tensile Strength of Cylindrical Concrete Specimens
F. ASTM C 157, Length Change of Hardened Hydraulic-Cement Mortar and Concrete
G. ASTM C 309, Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete
H. ICRI Technical Guideline No. 03732 Specifying Concrete Surface Preparation for Sealers, Coatings, and Polymer Overlays
I. ICRI Technical Guideline No. 03730 Guide for Surface Preparation for the Repair of Deteriorated Concrete Resulting from Reinforcing Steel Corrosion
1.4 SUBMITTALS:
A. Product Data: Submit manufacturer’s literature describing products and methods of mixing and application instructions.
B. Certificates: Submit test reports certified by an independent testing laboratory stating that materials and mix intended to be used meet specified requirements.
1.5 QUALITY ASSURANCE:
A. Manufacturer's Qualifications: The manufacturer shall be a company with at least five years experience and regularly engaged in the manufacture and marketing of products specified herein.
B. Installer Qualifications: Installation must be completed by a factory trained applicator using mixing equipment and tools approved by the manufacturer.
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 REPAIR MORTAR 039250 - 2
1.6 DELIVERY, STORAGE AND HANDLING:
A. Deliver products in original packaging, labeled with product identification, manufacturer, batch number and shelf life.
B. Store products in a dry area with temperature maintained between 50° and 85° F and Protect from direct sunlight.
C. Handle products in accordance with manufacturer's printed recommendations.
1.7 SITE CONDITIONS:
A. Observe the basic rules of concrete work. Do not install below 50˚F surface temperature. Install quickly if floor is warm and follow manufacturer's hot weather precautions.
PART_2_-_PRODUCTS
2.1 MANUFACTURER: Products of the following manufacturers, subject to compliance with requirements, will be acceptable:
A. Ardex Inc.
2.2 MATERIALS:
A. Portland cement-based structural repair mortar: Equivalent to Ardex FDM.
2.3 PERFORMANCE AND PHYSICAL PROPERTIES:
A. Meet or exceed the following values in a neat application for material cured at 70° F and 50% relative humidity:
1. Working Time: 20 – 40 minutes. 2. Compressive Strength: 3,500 psi at 1 day, 5,500 psi at 7 days, 7,000 psi at 28 days, ASTM C109. 3. Flexural Strength: 1,100 psi at 1 day, 1,150 psi at 28 days, ASTM C293. 4. Splitting Tensile Strength (Only applicable for extended application): 425 psi at 7 days and 600 psi at 28 days. 5. Modulus of Elasticity: 3.7 x 106 at 28 days. 6. Shrinkage: Less than 0.065% at 28 days, ASTM C157, air cured. 7. Color: Concrete gray. 8. Combustibility: Non-combustible, both before and after use. 9. Direct tensile bond: 260 psi at 28 days.
PART_3_-_EXECUTION
3.1 PREPARATION:
A. All concrete and masonry substrates must be sound, solid, dry, and completely free of all oil, grease, dirt, curing compounds and any substance that might act as a bond breaker. Overwatered, frozen or otherwise weak concrete surfaces must also be cleaned down to sound, solid concrete by mechanical methods such as scarifying, scabbling or similar in accordance with ICRI 03732 before priming. Acid etching and the use of sweeping compounds and solvents are not acceptable. Clark Patterson Lee 03/19/2014
JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 REPAIR MORTAR 039250 - 3
1. The repair area must be saw cut in a basic rectangular shape at least 1/2” in depth. The cuts should be made at 90° angle, and should be slightly keyed. Chip out the concrete inside the cuts to a minimum depth of 1/2” until the area is squared or box shape. 2. Mechanically prepare surface to obtain an exposed aggregate surface with a minimum surface profile of approximately 1/16”. 3. For cases with exposed reinforcing steel, mechanically clean the steal to remove all rust and any other contaminants in accordance with ICRI 03730. Prime the steel with ARDEX Bonding & Anti-Corrosion Agent™ prior to proceeding with repair.
3.2 JOINT PREPARATION:
A. Moving Joints – honor all expansion and isolation joints up through the underlayment. A flexible sealing compound suitable for the application may be installed. ARDEX ARDISEAL™ RAPID PLUS may be installed.
B. Control Joints and dormant cracks greater than 1/16” – fill all non-moving joints and cracks with ARDEX ARDIFIX™ Joint Filler.
3.3 INSTALLATION OF FULL DEPTH REPAIR MORTAR:
A. Examine substrates and conditions under which materials will be installed. Do not proceed with installation until unsatisfactory conditions are corrected.
B. Coordinate installation with adjacent work to ensure proper sequence of construction. Protect adjacent areas from contact due to mixing and handling of materials.
C. Mixing: Comply with manufacturer's printed instructions and the following.
1. Precondition components to temperature of 70° plus or minus 5° F prior to mixing. 2. Pre-dampen the inside of a 5 gallon pail or inside of a clean mortar mixer, and remove any excess water. 3. Add 5-6 pints of clean potable water per 50-pound bag. 4. Slowly add 1/3 of a 50 lb. bag. Once material is blended in, add the next third and so on until all material is added. 5. Mix using a ½” to ¾” low speed heavy-duty mixing drill with a heavy gauge square box (butterfly) mixing paddle. Forced action mortar mixers are also suitable. Mix to a uniform, lump-free consistency. Do not overwater. 6. For application depths greater than 4 inches, add up to 25 pounds clean, uniformly graded, saturated-surface-dry 3/8-inch aggregate per bag, as directed by manufacturer.
D. Application: Comply with manufacturer's printed instructions and the following.
1. Do not apply in freezing conditions or during precipitation. 2. Comply with manufacturer’s guides for hot and cold weather application. 3. ARDEX FDM™ can be applied to any prepared concrete surface using standard concrete practices. Allow material to take initial set before finishing. 4. When overlaying, Apply scrub coat of repair mortar into primed or saturated surface dry substrate to ensure intimate contact and establish bond. Apply ARDEX FDM™ while scrub coat is wet. 5. Steel trowel the mortar to the desired finish once it takes its initial set. 6. Vibrate closed–form repairs to ensure intimate contact with the substrate, establish bond, and ensure proper consolidation. Avoid over-vibration.
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JAMESTOWN CSD Lincoln Elementary Alterations 73654.01 REPAIR MORTAR 039250 - 4
7. ARDEX FDM™ can be installed to a minimum thickness of ½” up to 4” neat. For application depths greater than 4”, including full depth repairs up to 8”, extend ARDEX FDM™ with aggregate as recommended by manufacturer.
E. Curing:
1. Keep surface damp for 48 hours with continuous light water-fogging or curing blanket. 2. If no coating or sealer is to be applied, a water-based curing compound meeting ASTM standard C309 may be used. Do not use solvent-based curing compounds. 3. Allow to cure a minimum 72 hours before applying any final coatings or sealers.
F. Cleaning: Remove excess material before material cures. If material has cured, remove using mechanical methods that will not damage substrate.
3.4 PROTECTION:
A. Prior to the installation of the finish flooring, the surface of the underlayment should be protect from abuse by the use of plywood, Masonite or other suitable protection course. Remove as installation of finish floor progresses.
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