Minimum Compressive Strength. Concrete shall be made of materials accepted for the project, of the proportions designated by the Superintending Engineer and in accordance with the requirements hereinafter setforth. The proportions shall be based on 'laboratory tests Mix Minimum cylinder strength requirements 28 days and 7 days optional 0.070.3Kg / cm2 (Ibs. / ▇▇.▇▇. ) Modular Ratio Preliminary Tests Work Test Days 28 Days 7 1:2:4 2700 1800 1200 15 Ordinary
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