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3.04 REQUIRED TESTS <br />A. Obtain one strength test per day for each 50 cu. yds. or fraction thereof. A minimum of <br />one test shall be taken from each batch of concrete delivery to the sight and used. <br />Obtain one set of three (3) standard cylinders for each strength test. Mold and cure <br />cylinders under standard temperature and moisture conditions in accordance with ASTM <br />C31. Test one cylinder at 7 days, one cylinder at 28 days and retain the third cylinder for <br />later testing, if required. Testing shall be done in accordance with the requirements of <br />ASTM C39. <br />B. Perform and record the results of a slump test on a sample of concrete at the same <br />location and time concrete is obtained for the cylinders for the compressive strength test <br />in accordance with ASTM C94, Section 19. Also obtain the unit weight of the concrete <br />and perform an air test if the concrete is air entrained. The Engineer may require slump <br />tests to be made more frequently. <br />3.05 CONCRETE FAILING TO MEET STRENGTH REQUIREMENTS <br />A. Concrete having a 2&day strength of less than the minimum required strength shall be <br />removed and replaced with concrete meeting the strength requirements, at the <br />Contractor's expense. <br />+ + END OF SECTION + + <br />02440-5 02440 — Concrete Driveways, etc... <br />L <br />