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Concrete Quality

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:

  • Minimum compressive strength of 4500 psi at 28 days and a maximum of 0.45 water to cement ratio.

  • Air content of 6½ ± 1½%

  • 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.

  • Aggregates meeting ASTM C33 for severe exposure conditions.


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