1. Class A concrete in accordance with the standard spec section 702; 2. The proportion of ingredients of each batch shall be within the following limits and shall be as approved. Class A concrete cement content in lb/cu yd must be 564; 3. The relative yield of the concrete shall be determined in accordance with 505. The concrete when produced shall provide a relative yield of 1.00 ±0.02. When the relative yield is outside the tolerances, adjustments to the batch weights shall be made. The minimum amount of cement shall be used for the desired class of concrete. The cement content shall not be increased more than 60 lb/cu yd. The relative yield of the concrete shall be maintained as stated above. If Type IP or Type IP-A cements are to be used in the structural concrete, the cement content shall be increased by a multiplier of 1.06 times the minimum amount of cement required or the desired increased cement content for the specified class of concrete. For example: 1.06 x 564 = 598 lb/cu yd for class A concrete. yes no 4. Maximum water/cement ratio in lb of water per lb of cement must not exceed 0.450; 5. Minimum water/cement ratio in lb of water per lb of cement must not be below 0.380 yes no 6. Class A concrete must have a minimum compression strength of 3,500 PSI; 7. The cement shall be well protected from rain and moisture. All cement damaged by moisture, or which fails to meet the specified requirements shall be rejected and removed from the work. Cement stored for a period longer than 60 calendar days shall be retested before being used on the work. Cement of different brands, types, or from different mills shall be stored separately
