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Gateway Park Center PERKINS+WILL <br /> 810495.00 <br />12/06/18 <br />033000-14 Cast-In-Place <br />Concrete <br />ii.Mold cylinders in accordance with ASTM C 31 and cure <br />under standard moisture and temperature conditions in <br />accordance with ASTM C 31, Section 7 (a). Quantity of <br />cylinders listed below is based on a cylinder size of 4 inch <br />(100mm) diameter x 8 inches (200mm) long. If 6 inch <br />(150mm) diameter by 12 inch (300mm) long cylinders are <br />used, the total quantity of cylinders may be reduced by one <br />with two cylinders instead of three tested at the age <br />designated for determination of f’c. <br />iii.Test cylinders in accordance with ASTM C 39. For <br />specified concrete strength of 10,000 psi (70MPa) and <br />above, cylinders shall be ground and not capped. <br />iv.For 28 day mixes mold six cylinders. Test two cylinders at <br />seven days and three cylinders at 28 days. The 28 day <br />strength shall be the average of the three 28 day cylinders. <br />One cylinder shall be retained in reserve for later testing if <br />required. <br />v.For 56 day mixes mold seven cylinders. Test one cylinder <br />at seven days, two cylinders at 28 days, and three <br />cylinders at 56 days. The 56 day strength shall be the <br />average of the three 56 day cylinders. One cylinder shall <br />be retained in reserve for later testing if required. <br />vi.For 90 day mixes mold eight cylinders. Test one cylinder <br />at seven days, one at cylinder at 28 days, two cylinders at <br />56 days, and three cylinders at 90 days. The 90 day <br />strength shall be the average of the three 90 day cylinders. <br />One cylinder shall be retained in reserve for later testing if <br />required. <br />vii.When high early strength concrete is required by <br />Contractor, additional cylinders shall be made and tested <br />as required at Contractor’s expense. <br />viii.If one cylinder in a test manifests evidence of improper <br />sampling, molding or other damage, discard cylinder and <br />base test results on that of remaining cylinder. <br />4.Owner’s Testing Agency shall evaluate concrete for conformance with <br />Specifications as follows: <br />a)Slump: <br />i.Owner’s Testing Agency shall maintain a slump moving <br />average, comprised of the average of all batches or most <br />recent five (5) batches tested, whichever is fewer. <br />b)Strength test: <br />i.Owner’s Testing Agency shall maintain a compressive <br />strength moving average, comprised of three (3) <br />consecutive strength test results, for each mix design used <br />in Work.