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L <br /> L <br /> 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 /> r <br /> kt <br /> 02440-5 02440 — Concrete Driveways , etc . . . <br />