02110 Subgrade Stabilization (Class C Fly Ash) 02110-1 A
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02110 SUBGRADE STABILIZATION (CLASS C FLY ASH) 02110-1 A. Description 1. This work shall consist of construction one or more layers of a mixture of soil. Type C Fly Ash, and water in accordance with these specifications and in reasonably close conformity with the lines, grades, thicknesses, and typical cross sections shown on the plans and specifications. B. Fly Ash Materials 1. Materials shall conform to the requirements specified in the following sections of the latest specifications: Type C Fly Ash - ASTM C 593 and ASTM C 311 Water - AASHTO T 26 C. Construction Requirements 1. Preparation and Materials - The prepared subgrade shall be scarified to the depth and width required for the subgrade stabilization. The material thus obtained shall be pulverized until the material is substantially free of lumps which are over 1 inch in diameter. The depth of scarification shall be carefully controlled and blading operations conducted in a manner to prevent the surface of the subgrade below the scarified material from becoming disturbed. 2. Application of Fly Ash: a. Dry Mix - Fly Ash in dry form may be used provided that its use if allowed under the local jurisdiction. Care must be taken to prevent blowing and loss of materials. The methods of spreading must be such to provide a uniform mixture. b. The weight of Fly Ash shall be 15 percent by weight (unless noted otherwise on the plans) assuming a soil dry density of 115 pounds per cubic foot. 3. Addition of Water - Water as needed shall be added during mixing operation. The method of application must be rapid and uniform. The moisture content must be at least 20 percent and desirably should be between optimum and optimum plus 4 percent (ASTM D=-698). 4. Mixing - The Fly Ash and soil must be thoroughly mixed throughout the scarified depth. The mixture shall then be compacted to specified densities with 1 ½ hours of the initial water application to prevent setting of the treated moisture in a non- compacted state. Additional water shall be added if necessary to bring the moisture content to at least 5 percent above optimum. 5. Compaction - After the materials have been satisfactorily mixed and aged, the mixture shall be laid compacted to at least 95 percent of the Standard Compaction maximum dry density (ASTM D-698). Compacted lifts shall not exceed 9 inches in thickness. Light sprinkling may be required to maintain the specified moisture content. Compaction shall be accomplished with sufficient blading to eliminate all irregularities. 6. Finishing - Following compaction, the subgrade shall be trimmed to the required line and grade. Final rolling of the completed surface shall be accomplished with a pneumatic tire roller. 02110 Subgrade Stabilization (Class C Fly Ash) 1 of 2 Project No. 89008535 NE 104th Street Improvements Phase II-A December 2017 02110 SUBGRADE STABILIZATION (CLASS C FLY ASH) 02110-2 7. Protection and Curing - Upon completion of the compaction and finishing of the treated subgrade, no vehicles or equipment other than sprinkling equipment shall be permitted upon the treated subgrade for a period of 24 hours. Heavy construction equipment shall not be allowed upon the treated subgrade for a period of two days. Any damage to the treated subgrade due to use of construction equipment during this time shall be repaired at the CONTRACTOR’s expense. During the curing period, the treated subgrade shall be cured by lightly sprinkling the surface with water at frequent intervals to prevent drying. Care should be taken after the curing period to prevent damage by excessive traffic or weights. 8. Maintenance - The CONTRACTOR shall be required to maintain at his own expense the entire subgrade within the limits of the improvements in good condition satisfactory to the engineer from the time he first starts work until all work has been completed. Maintenance shall include immediate repairs of any defects that may occur during construction of the work. Repairs are to be made in a manner to ensure uniform surface and the durability of the part impaired. D. Measurement 1. Subgrade Stabilization shall be measured by the square yard of area stabilized, in accordance with the plans. E. Payment 1. Payment shall be made on the measured square yards (within the limits noted on the plans) as listed in the Unit Prices, and shall constitute full compensation for all labor, materials and equipment necessary to complete the item. END OF SECTION 02110 Subgrade Stabilization (Class C Fly Ash) 2 of 2 Project No. 89008535 NE 104th Street Improvements Phase II-A December 2017 02115 DEMOLITION & REMOVAL 02115-1 A. General 1. Demolition and Removal shall be done in accordance with Section 2101 of the “Construction and Material Specifications”. All work under this Section shall include but not be limited to driveways, pavement, trees and abandoned drainage structures and pipes. B. Payment 1. Payment shall be made at the contract Lump Sump price for “Demolition and Removal” as listed in section 00412-Unit Prices, and shall constitute full compensation for all labor, materials, and equipment necessary to complete the item. END OF SECTION 02115 Demolition and Removal 1 of 1 Project No. 89008535 NE 104th Street Improvements Phase II-A December 2017 02160 EROSION CONTROL 02160-1 A. General 1. The CONTRACTOR shall provide erosion control for all areas disturbed during construction. The City has adopted a set of guidelines and procedures for controlling erosion entitled Erosion and Sediment Control Specifications in Section 5100 of the Kansas City, Missouri Standards Specifications and Design Criteria. The CONTRACTOR is to assume that the work is to be done under the City’s General Permit. The CONTRACTOR does not need to make separate application with the Missouri Department of Natural Resources. 2. All the requirements of the Kansas City Metropolitan Chapter of the American Public Works Association (APWA), Standards Specifications and Design Criteria apply as amended and supplemented by the Department of Public Works of the City of Kansas City, Missouri (KCMO). Sections of said Specification will be hereinafter referred to as “APWA-KCMO.” B. Erosion Control Plan 1. The CONTRACTOR shall follow the erosion control plans that are shown for each Phase in the Contract Drawings, unless otherwise directed by the Engineer. 2. The construction and materials specifications for the final seed and sod for re- vegetation of disturbed ground surface areas shall be governed by Section 2400 of the Standards Specifications and Design Criteria. C. Stormwater Pollution Prevention Plan (SWPPP) 1. The CONTRACTOR shall prepare, submit and follow the SWPPP form and process that are attached as Appendix A to section 02160, Erosion Control. D. Measurement and Payment 1. Measurement: All Quantity Measurements will be made at the unit as listed in section 00412, Bid Form-Unit Prices. 2. Payment: Payment will be made at the contract unit price as listed in section 00412, Bid Form-Unit Prices. Payment shall constitute full compensation for labor, materials, and equipment necessary to complete the item. 3. Also Grading Berms and/or Temporary Slope Drains are considered subsidiary to other items of work for erosion control. 4. The SWPPP preparation, submittal and reporting procedures shall be considered subsidiary to other items of work for erosion control. END OF SECTION 02160 Erosion Control 1 of 1 Project No. 89008535 NE 104th Street Improvements Phase II-A December 2017 SECTION 02200 – EARTHWORK PART 1 – GENERAL A. The Contractor shall perform all work necessary to excavate, remove, dispose of or compact all materials encountered within the limits of the project, at the locations and to the lines and grades shown on the plans. This work shall also include stripping, stockpiling and re spreading of topsoil. All work shall be performed in accordance with APWA Standard Specification and Design Criteria Section 02102 except as amended herein. B. A copy of the Geotechnical Report that has been prepared by TSI Engineering, Inc. for the project entitled “Report of Subsurface Exploration and Geotechnical Engineering Evaluation – 104th Street Improvements, Kansas City, Missouri, dated November 19th, 2012 has been included in Appendix B. C. All excavation shall be considered as “Unclassified Excavation”. All excess and unsuitable excavation shall be disposed of off the site of the project at an approved disposal site by and at the expense of the Contractor. D. The contractor shall perform all work necessary to over-excavate and replace soft materials below the planned embankment areas as indicated on the drawings and as directed in the field at the time of construction. Payment for over-excavation of replacement of unsuitable material shall be based on the unit price bid applied to the field measured volume of material actually over-excavated. PART 2 – PRODUCTS A. When insufficient on-site material is available for construction of embankment foundations, embankments, and fills, the Contractor shall furnish approved borrow material as required to construct the proposed improvements to the lines and grades shown on the drawings. B. Contractor furnished borrow shall be equal to or better than the materials found on the project site, shall meet the material requirements of APWA Section 2102 and shall be subject to the approval of the Engineer. C. Contractors are advised that the proposed sites for Contractor furnished material will be sampled and tested only after award of the Contract and after proof of an agreement between the property owner and the Contractor authorizing use of the borrow site has been provided to the Engineer. The Contractor shall be solely responsible to provide the necessary preliminary subsurface investigations to determine depth to rock, general soil characteristics, etc. Engineer shall be notified in writing sufficiently in advance of the proposed use of the borrow site to allow the Engineer three weeks for review and approval of the site.