Vol 2 - Garney Construction

CONCRETE MIX DESIGN, CLASS GT00F1S1P0C1A. Mix Locations: Grout topping on precast roof panels.B. Exposure Categories and Classifications: F1S1P0C1.C. Mix Properties:1. Limit water to cementitious materials ratio (W/Cm) in mix design tomaximum value of 0.40.2. Minimum compressive strength (f’c) shall be 3,500 psi at 28 days and4,500 psi at 56 days.3. Design mix shall be designed to conform to shrinkage limits except asfollows:a. Results at end of 28 day drying period shall not exceed0.030 percent if 3-inch prisms are used, or exceed 0.028 percent if4-inch prisms are used. Aggregate will be rejected if test valuesexceed these limits.4. Aggregate Grading: Aggregate shall conform to requirements for fineaggregate in accordance with ASTM C33/C33M.5. Air-entraining admixtures are prohibited in concrete mixtures and totalair content shall not be greater than 3 percent, for the following:a. Slabs to receive hard-troweled finish.b. Slabs to receive dry shake floor hardener.c. Slabs to receive topping placed monolithically as two-course flooron top of plastic concrete.6. Unless otherwise specified, provide 6 percent air content.a. See ASTM C33/C33M for tolerance on oversize for variousnominal maximum size designations.b. Tolerance of air content is plus or minus 1.5 percent.7. Provide cementitious materials in accordance with one of the following:a. ASTM C150/C150M Type II; inclusion of supplementarycementitious materials in design mix is optional.b. ASTM C150/C150M types other than Type II, plus supplementarycementitious materials in accordance with one of the following:1) Tricalcium Aluminate Content of Total CementitiousMaterials: Maximum 8 percent by weight.2) Provide documentation of test results in accordance withASTM C1012/C1012M, for combinations of cementitiousmaterials providing sulfate resistance with expansion lessthan 0.10 percent at 6 months.c. ASTM C595/C595M Types IP or IS (less than 70), tested tocomply with moderate sulfate resistance option (MS).1) Provide documentation of test results in accordance withASTM C1012/C1012M, for combinations of cementitiousPW/WBG/382059CAST-IN-PLACE CONCRETEAUGUST 15, 2012 03 30 00 SUPPLEMENT 06 - 1©COPYRIGHT 2012 CH2M HILL