Concrete Modulus of Elasticity Test

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Concrete Modulus of Elasticity Test

1. Size of concrete specimens for compression modulus of elasticity test

Concrete cubic specimen: 150X150X300mm, 100X100X300mm, 200X200X400mm

Cylindrical concrete specimen: φ150X300mm, φ100X200mm, φ200X400mm

2. Brief introduction of concrete modulus of elasticity test procedure

1) Use at least two companion specimens to determine the compressive strength in accordance with test method ASTM C39/C39M prior to the test for modulus of elasticity.

2) Place the concrete specimen, with the strain-measuring equipment attached, on the lower platen 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.

3) Load the specimen at least three times. Do not record any data during the first loading. Base calculations on the average of the results of the subsequent loadings.

4) Apply the load continuously and without shock. Load the specimen until the applied load is 40% of the average ultimate load of the companion specimens.

5) During the first loading, observe the performance of the gauges. Correct any attachment or alignment defects that may be causing erratic readings prior to the second loading. For the second and subsequent loadings, obtain each set of readings as follows: record, without interruption of loading, the applied load and longitudinal strain at the point when the longitudinal strain is 50 microstrain and when the applied load is equal to 40% of the ultimate load of the companion specimen.

6) Upon reaching the maximum load, except on the final loading, reduce the load to the zero at the same rate at which it was applied.