In this study, a relationship is determined and correlated between non-destructive testing (NDT) named as Schmidt rebound hammer test and concrete destructive compression test. The Schmidt rebound hammer is principally a surface hardness tester with an apparent theoretical relationship between the strength of concrete and the rebound number of the hammer. In order to calibrate the Schmidt Hammer with the various-aged concretes, cube specimens of 28 - 90 days and a number of core samples from different reinforced concrete structures have been tested. This calibration has been done to get the related constant obtained from Schmidt and compression tests. The best fit correction factors for the concrete compressive strength-Schmidt rebound hammer relationship are obtained through processing correlation among the data sets. The correction factors can be easily applied to insitu concrete strength as well as existing concrete structures.
Key words: Concrete quality, compressive strength, non-destructive tests, Schmidt.
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