Table 3-12. - Approximate Mixing Water and Air Content Requirements for Different Slumps and Maximum Sizes of Aggregates

aggregate and calculate the quantities per cubic yard of water, cement, coarse aggregate, and air. Finally, subtract the sum of the absolute volumes of these materials in cubic feet from 27 cubic feet per 1 cubic yard to give the specific volume of fine aggregate. If needed, more trial batches should be mixed to obtain the desired slump and air content while you keep the water-cement ratio constant.

MIX VARIATIONS

The proportions arrived at in determining mixes will vary somewhat depending upon which method is