ASTM C469/C469M:14 pdf free download – Standard Test Method for Static Modulus of Elasticity and Poisson’s Ratio of Concrete in Compression.
Subject specimens to the specified curing conditions and test at the age for which the elasticity information is desired. Test specimens within 1 h after removal from the curing or storage room. Spccimcns removed from a moist room for test shall be kept moist by a wet cloth covering during the interval between removal and test.
5.2 Drilled Core Specimens—Cores shall comply with the requirements for drilling, and ruoiswre conditioning applicable to compressive strength specimens in Test Method C42/C42M, excep4 that only diamond-drilled cores having a length-to- diameter ratio greater than 1.50 shall be used. Requirements relative to storage and to ambient conditions immediately prior to test shall be the same as for molded cylindrical specimens.
5.3 If the specimen as cast does not meet the planeness requirements. planeness shall be accomplished by capping in accordance with Practice C617. or by lapping. or by grinding. It is not prohibited to repair aggregate popouts that occur at the ends of specimens, provided the total area of popouts does not exceed 10 of the specimen area and the repairs are made before capping or grinding is completed (Note 2). Planeness will he considered within tolerance when a 0.05 mm 10.002 in.J feeler gauge will not pass between the specimen surface and a straight edge held against the surface.
Nuit 2— Repair may be niade by eposying the aggregate hack in place or by tilling the void with capping material and allowing adequale lime br it to harden.
5.4 Measure the diameter ot the test specimen by caliper to the nearest 0.2 mm 10.01 in.J by averaging two diameters measured at right angles to each other near the center of the length of the specimen. Use this average diameter to calculate the cross-sectional area. Measure and report the length of a molded specimen, including caps. to the nearest 2mm 10.1 in.I. Measure the length of a drilled specimen in accordance with Test Method C174/C174M: report the length, including caps, to the nearest 2 mm 10.1 in].
6. Procedure
6.1 The temperature surrounding the specimen shall not viny by more than 2°C L4°FJ during a test.
6.2 Except as provided in 6.5. use at least two companion specimens to determine the compressive strength in accordance with Test Method C39/C39M prior to the test for modulus of elasticity.
6.3 Place the specimen, with the strain-measuring equipment attached, on the lower platen or hearing block of the testing machine. Carefully align the axis of the specimen with the center of thrust of the spherically-seated upper bearing block. Note the reading on the strain indicators. Before applying the load on the specimen. tilt the movable portion of the spherically seated block by hand so that the bearing face appears to be parallel to the top of the test specimen based on visual observation.