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ST. BARBARA CATHOLIC SCHOOL TASK 2 75-24272-01 <br />DIOCESE OF ORANGE SEPTEMBER 12TH, 2024 <br />SANTA ANA, CA BID & PERMIT SET <br /> <br />CAST-IN-PLACE CONCRETE 033000 - 3 <br />1. Maximum Coarse-Aggregate Size: 1-1/2 inchesnominal. <br />2. Fine Aggregate: Free of materials with deleterious reactivity to alkali in cement. <br />C. Chemical Admixtures: Certified by manufacturer to be compatible with other admixtures and <br />that do not contribute water-soluble chloride ions exceeding those permitted in hardened <br />concrete. Do not use calcium chloride or admixtures containing calcium chloride. <br />1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A. <br />2. Retarding Admixture: ASTM C 494/C 494M, Type B. <br />3. Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D. <br />4. High-Range, Water-Reducing Admixture: ASTM C 494/C 494M, Type F. <br />5. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type G. <br />6. Plasticizing and Retarding Admixture: ASTM C 1017/C 1017M, Type II. <br />D. Water: ASTM C 94/C 94M and potable. <br />2.5 CURING MATERIALS <br />A. Evaporation Retarder: Waterborne, monomolecular film forming, manufactured for application <br />to fresh concrete. <br />B. Absorptive Cover: AASHTO M 182, Class 2, burlap cloth made from jute or kenaf, weighing <br />approximately 9 oz./sq. yd. when dry. <br />C. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene sheet. <br />D. Water: Potable. <br />E. Clear, Waterborne, Membrane-Forming Curing Compound: ASTM C 309, Type 1, Class B, <br />dissipating. <br />2.6 CONCRETE MIXTURES, GENERAL <br />A. Prepare design mixtures for each type and strength of concrete, proportioned on the basis of <br />laboratory trial mixture or field test data, or both, according to ACI 301. <br />B. Cementitious Materials: Use fly ash as needed to reduce the total amount of portland cement, <br />which would otherwise be used, by not less than 40 percent. <br />C. Admixtures: Use admixtures according to manufacturer's written instructions. <br />1. Use water-reducing admixture in concrete, as required, for placement and workability. <br />2. Use water-reducing and -retarding admixture when required by high temperatures, low <br />humidity, or other adverse placement conditions. <br />3. Use water-reducing admixture in pumped concrete, concrete for heavy-use industrial <br />slabs and parking structure slabs, concrete required to be watertight, and concrete with a <br />w/c ratio below 0.50.