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r <br />r <br />T • Compressive Strength Average of any day's Any One Cylinder <br />r for Design Purposes pour or 3 consecutive <br />cylinders <br />Pounds Per Sq.In. Pounds Per Sq. ln. Pounds Per Sq.In. <br />l At 7 days At 28 days At 7 days At 28 days <br />I 4000 2750 4000 2500 3850 <br />4. For each set of cylinders, two cylinders will be tested at 7 days and <br />three cylinders at 28 days, and one cylinder will be retained in <br />'~ reserve for later testing if required. <br />5. Concrete which does not reach the required 4,000 psi minimum com- <br />pressive strength in 28 days shall be removed from the job and re- <br />placed at the Contractor's expense. <br />C. Entrained Air Tests <br />Entrained air content will be determined in accordance with ASTM C231, <br />C173, C138, AASHTO T152, T196, or T199; however, rejections will be based <br />upon the results of tests made in accordance with ASTM C231, C173, <br />AASHTO T152 or T196. <br />- • D. Slump Tests <br />The consistency of the concrete will be determined in accordance with <br />_ AASHTO T119. <br /> <br />i <br />