CHARACTER OF STRESS FAILURE OF HIGH-STRENGTH CONCRETE DETERMINED BY ACOUSTIC EMISSION METHOD

摘要

This paper presents results of investigations into the failure of high-strength concrete under compression carried out by means of the acoustic emission (AE) method. A number of such concretes, differing in their composition and compression strength were investigated. Several AE parameters, including AE events, AE counts, the rate of counts and the AE signal RMS value, were recorded simultaneously. On this basis it has been established that the failure of the tested concretes is a three-stage process. The initiating and critical stress values which delimit the particular stages in the process of failure have been determined. It has been found that these values depend on the compression strength of the investigated concretes and they increase with it. The obtained results are of both theoretical and practical importance.