Ensaio não destrutivo para determinação da resistência à compressão sob tensão

Abstract

From the need to find methods for using technology in construction is generated many studies seeking alternatives to allow the use and application equipment, specifically for expert analysis of the behavior of a concrete structure. The research aims to determine the strength of the concrete compression, rebound hammer by reflection, a non-destructive test, under voltage. The objective was to determine the compressive strength of the test piece bodies, the rebound rate through the compressive loads imposed by the testing machine, gradually increasing the load. The reflection rebound hammer is a device that does not have a defined accuracy of results, but depending on the mode that is used is possible to achieve satisfactory results. We used concrete 30 and 35 MPa, which were molded into body-of-proof in cubic format 10x10x10 cm, later four bodies-specimens were tested in compression testing machine to break, which was given the maximum voltage. This tension that was used for testing other four bodies-of-test, in which were applied levels of progressively shipments (0%, 10%, 20%, 30%, 40% and 50% of rupture stress), each level was stabilized to the test with the reflection rebound hammer was executed. The rebound indices resulted in compressive strength was compared in the equations developed curves generated by the authors (EVANGELISTA, 2002; MACHADO, 2005; PALACIOS, 2012). The results show that the strength of the concrete increases as the compression ratio increases rebound occurring in the two respective concrete mixtures of 30 and 35 MPa at their ages of 28 and 56 days.