Estimation of the compressive strength by non-destructive methods, 1: Differences among four non-destructive methods
1990
Koyama, K. (Tottori Univ. (Japan). Faculty of Agriculture) | Hattori, K. | Tsuge, M.
In 1989, we carried out an experimental study on the estimation of compressive strength by non-destructive methods. The non-destructive methods used to estimate the strength are as follows: a rebound method (Schmidt hammer N type and P type) b penetration method (Pin tester) c resonant frequency method (dynamic modulus of elasticity) d pulse velocity method (ultrasonic pulse velocity) The compressive strength estimated these methods was compared to the measured compressive strength from cylinder or cube. As we were not able to get a lot of data on the strength, it was difficult to estimate the reliable compressive strength. The results obtained are as follows. 1 Among the non-destructive methods, Pin tester method showed the closest estimation to the measured strength, but this method took much time to carry out the test. 2 The estimation from Schmidt hammer method disperses frequently because the surface hardness of concrete is greatly affected by the surface condions such as moisture content and surface roughness. 3 Pulse velocity method is promising to estimate the strength of concrete because the unskillful people can use it easily
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