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1 aggregate, an air entraining agent, and water which shall conform to the requirements of <br /> 2 Section 90 of the State Specifications, as modified herein. <br /> 3 <br /> 4 B. Concrete Designations: Concrete will be designated by Class (per State Specifications), <br /> 5 cement factor in pounds per cubic yard, or by 28-day compressive strength. <br /> 6 <br /> 7 <br /> e <br /> 9 MAXIMUM <br /> 10 MINIMUM WATER <br /> 11 COMPRESSION CEMENT ENTRAINED <br /> 12 CONCRETE STRENGTH SLUMP RATIO AIR <br /> ' 13 TYPE OF USE CLASS AT 28 DAYS INCHES (BY WEIGHT) REQUIRED* <br /> 14 Liquid Containing <br /> 15 Structures: <br /> 16 Slabs & Footings A 3500 2 to 3 0.45 5-1/2% ±1°% <br /> 17 Vertical Wall Sections <br /> 18 & Columns A 3500 3 to 4 0.45 5-1/2% +1% <br /> 19 Mass Concrete & <br /> 20 Unformed Slopes A 3500 1 to 2 0.45 5-1/2% ±1% <br /> 21 Other Structural <br /> 22 Concrete: <br /> 23 <br /> 24 Interior & Exterior <br /> 25 Slabs, Footings, <br /> 26 and Caissons A 3000 2 to 3 0.50 <br /> 27 <br /> 26 Vertical Wall <br /> 2e Sections & Columns A 3000 3 to 4 0.50 <br /> 30 Curbs, Gutters, B 2500 3 to 4 0.55 ----- <br /> 31 Sidewalks, Mowing <br /> 32 Strl s <br /> 33 Pipe Bedding, Thrust C 2000 3 to 4 0.60 ----- <br /> 34 Blocks, Concrete Fill <br /> 35 <br /> 36 * Based on 1-1/2" maximum aggregate size. Where 1" maximum aggregate size is used, increase <br /> 37 entrained air by 1/2%. <br /> 38 <br /> 39 C. Concrete Class: <br /> 40 <br /> 41 Class A concrete shall contain a minimum of 564 pounds of Portland cement per cubic yard. <br /> 42 <br /> 43 Class B concrete shall contain a minimum of 470 pounds of Portland cement per cubic yard. <br /> 44 <br /> 45 Class C concrete shall contain a minimum of 376 pounds of Portland cement per cubic yard. <br /> 46 <br /> 47 <br /> CONCRETE <br /> 042894 03100-5 <br />