In general, concrete should be mixed and delivered according to the requirements of ASTM C94, "Standard Specifications for Ready Mixed Concrete". Concrete specifications are as follows:
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Minimum compressive strength of 4500 psi at 28 days and a maximum of 0.45 water to cement ratio.
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Air content of 6½ ± 1½%
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Maximum five (5) inch slump. When mixes containing high range water reducers (superplasticizers) or combination of type A and type E admixtures (flowing concrete) are used, the slump as placed should not exceed eight (8) inches.
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Aggregates meeting ASTM C33 for severe exposure conditions.
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