Current Version: September 26, 2012 Previous Versions: 02/24/10, 06/16/08, City of San Marcos Adopted 05/15/2014 08/20/07 Revised 06/01/2018 Item No. 360S Concrete Pavement 360S.1 Description This item shall consist of a pavement and/or base of Portland Cement concrete, with or without reinforcement as indicated on the Drawings, with or without monolithic curbs, constructed as herein specified, on prepared subgrade or base course in conformity with the thickness and typical cross sections indicated on the Drawings. Concrete to be considered of satisfactory quality provided it is made (a) of materials accepted for job, (b) in the proportions established by the Contractor and (c) mixed, placed, finished and cured in accordance with the requirements of this specification. This specification is applicable for projects or work involving either inch-pound or SI units. Within the text and accompanying tables, the inch-pound units are given preference followed by SI units shown within parentheses. 360S.2 Submittals The submittal requirements of this specification item may include: Mix design option(s) of the class of concrete required on the project, The supplier of the concrete mix design(s) and type of mixing equipment, and Type of admixtures to be used with the concrete mixes. 360S.3 Materials A. Cementatious Materials Portland cement shall conform to ASTM C 150, Type I (General Purpose) and Type III (High Early Strength). Type III cement shall be used when high early strength concrete is indicated on the Drawings. If the use of high early cement is not specified and the Contractor desires to use it, the Contractor shall obtain written permission from the Engineer or designated representative prior to its use and shall assume all additional costs incurred by the use of such cement. All cement shall be of the same type and from the same source for a project unless written permission if first received from the Engineer or designated representative. Portland cement manufactured in a cement kiln fueled by hazardous waste shall be considered as an approved product if the production facility is authorized to operate under regulation of the Texas Commission on Environmental Quality (TCEQ) and the United States Environmental Protection Agency (USEPA). Supplier shall provide current TCEQ and EPA authorizations to operate the facility. Bulk or sacked cement may be used and a bag shall contain 94 pounds (42.6 KG) net. All bags shall be in good condition at the time of inspection. Bulk cement shall be weighed on approved scales as herein prescribed. 360S 09/26/12 Page 1 Concrete Pavement Current Version: September 26, 2012 Previous Versions: 02/24/10, 06/16/08, City of San Marcos Adopted 05/15/2014 08/20/07 Revised 06/01/2018 All cement shall be stored in a suitable weather tight building or bin, which will protect the cement from dampness. The cement shall be so stored as to provide easy access for proper inspection. Any cement, which has become partially set or which contains hard lumps or cakes or cement salvaged from discarded or used bags, shall not be used. Fly ash (denoted by Texas DOT designations Type A and Type B) may replace 20 to 35 percent of a mix design’s Portland cement content by absolute volume. Fly ash shall not be used in mix designs with less that five (5) sacks of Portland cement per cubic yard [six and a half (6.5) sacks of Portland cement per cubic meter] unless specifically permitted by the Contract plans of project manual. Fly ash shall conform to the requirements of Item 405S, "Concrete Admixtures". B. Admixtures Concrete admixtures conforming to Item No. 405S, "Concrete Admixtures" may be used when approved by the Engineer or designated representative to minimize segregation, improve workability, reduce the amount of mixing water and to provide normal hot weather concreting provisions. The use of admixtures shall not alter the approved mix designs, except for water content. C. Coarse Aggregate Coarse aggregate shall consist of durable particles of gravel, crushed blast furnace slag and/or crushed stone of reasonably uniform quality throughout, free from injurious amounts of salt, alkali, vegetable matter or other objectionable material, either free or as an adherent coating on the aggregate. It shall not contain more than 0.25 percent by weight of clay lumps nor more than 1.0 percent by weight of shale nor more than 5.0 percent by weight of laminated and/or friable particles when tested in accordance with TxDOT Test Method Tex-413-A. Coarse aggregate shall have a wear of not more than 45 percent when tested according to TxDOT Test Method Tex-410-A and when tested by standard laboratory methods shall meet the following grading requirements: Retained on 1 3/4 inch (43.75 mm) sieve 0% Retained on 1 1/2 inch (37.5 mm) sieve 0 to 5% Retained on 3/4 inch (19.0 mm )sieve 30 to 65% Retained on 3/8 inch (9.5 mm) sieve 70 to 90% Retained on No. 4 (4.75 mm) sieve 95 to 100% Loss by Decantation TxDOT Test Method *Tex-406-A. 1.0% Maximum * In the case of aggregate made primarily from crushing of stone. If the material finer than the 200 sieve is definitely established to be the dust of fracture 360S 09/26/12 Page 2 Concrete Pavement Current Version: September 26, 2012 Previous Versions: 02/24/10, 06/16/08, City of San Marcos Adopted 05/15/2014 08/20/07 Revised 06/01/2018 essentially free from clay or shale as established by Part III of TxDOT Test Method Tex-406-A, the percent may be increased to 1.5. When the plans do not require a monolithic pour of curb or curb and gutter, the Contractor may elect to use the following gradation of coarse aggregate for curb or curb and gutter: Retained on 1 1/2 inch (37.5 mm) sieve 0% Retained on 3/8 inch (9.5 mm) sieve 5 to 30% Retained on No. 4 (4.75 mm) sieve 75 to 100% Where the coarse aggregate is delivered on the job in 2 or more sizes or types, each type and/or size shall be batched and weighed separately. All aggregates shall be handled and stored in such a manner as to prevent size segregation and contamination by foreign substances and maintain as nearly as possible in a uniform condition of moisture. When segregation is apparent, the aggregate shall be remixed with suitable equipment as required. At time of its use, the aggregate shall be free from frozen material and aggregate containing foreign materials will be rejected. Coarse aggregate that contains more than 0.5 percent free moisture by weight shall be stockpiled for at least 24 hours prior to use. Adequate storage facilities shall be provided for approved materials. The intermixing of non-approved materials with approved materials either in stockpiles or in bins will not be permitted. Aggregates from different sources shall be stored in different stockpiles unless otherwise approved by the Engineer or designated representative. D. Fine Aggregate Fine aggregate shall be free from injurious materials of salt, alkali or vegetable matter. It shall not contain more than 0.5 percent by weight of clay lumps. When subjected to the color test for organic impurities, TxDOT Test Method Tex-408-A, the fine aggregate shall not show a color darker than standard. Unless shown otherwise on the drawings, fine aggregate shall have an acid insoluble residue of at least 60% by weight when tested in accordance with Tex 612-J. Unless specified otherwise, fine aggregate shall meet the following grading requirements: Retained on 3/8 inch (9.5 mm) sieve 0% Retained on No. 4 (4.75 mm) sieve 0 to 5% 360S 09/26/12 Page 3 Concrete Pavement Current Version: September 26, 2012 Previous Versions: 02/24/10, 06/16/08, City of San Marcos Adopted 05/15/2014 08/20/07 Revised 06/01/2018 Retained on No. 8 (2.36 mm) sieve 0 to 20% Retained on No. 16 (1.185 mm) sieve 15 to 30% Retained on No. 30 (600 µm) sieve 35 to 75% Retained on No. 50 (300 µm) sieve 70 to 90% Retained on No. 100 (150 µm) sieve 90 to 100% Retained on No. 200 (75 µm) sieve 97 to 100% Fine aggregate will be subjected to the Sand Equivalent Test, TxDOT Test Method Tex-203-F. The sand equivalent value shall not be less than 80. E. Mineral Filler Mineral filler shall consist of clean stone dust, crushed sand, crushed shell or other approved inert material. It shall meet the following requirements when tested in accordance with TxDOT Test Method Tex-401-A: Retained on No. 30 (600 µm) sieve 0% Retained on No. 200 (75 µm) sieve 0 to 35% Where fine aggregate is delivered to the job in 2 or more sizes or types, each type and/or size of material shall be batched and weighed separately. Where mineral filler is used, it shall be batched and weighed separately. At the time of its use the fine aggregate shall be free from frozen material and aggregate containing foreign material will be rejected. All fine aggregate shall be stockpiled for at least 24 hours prior to use. F. Mixing Water Water for use in concrete and for curing shall be free from oils, acids, organic matter or other deleterious substances and shall not contain more than 1,000 parts per million of chlorides as Cl nor more than 1,000 parts per million of sulfates as SO4.