Analysis on the reliability of sclerometer test results / Mohd. Norli Md. Saleh

The difficulties of core cutting, and indeed the entire procedure of making, curing and testing of standard test specimens could be avoided if concrete were tested in situ in a manner harmless to the part tested. Various attempts to devise non-destructive tests have been made but few have been successful One testing method mat has found practical application within a limited scope is the rebound hammer test, devised by Ernst Schmidt It is also known as the impact hammer or sclerometer test. Some researchers concluded mat this test depicted the surface hardness only and non direct correlation against the crushing strength of the test sample could be derived from the results. This is particularly true on samples more than 1 month old. Hitherto, rebound hammer results are always taken with a pinch of salt and other supporting test results are hence forth consulted.