VALIDATION OF THE RESULTS OF NON-DESTRUCTIVE TESTS IN DETERMING COMPRESSIVE STRENGTH OF CONCRETE

Abstract

The aim of this research is to use of combined method of non- destructive tests for analyzing the results of the tests for 71 concrete cubes measuring 150 mm different in terms of the mixing ratios and the quality of the materials used in the concrete mix and the concrete cube age. Two types of tests were performed on these cubes: 1) non- destructive tests (ultrasonic plus velocity- rebound hammer); 2) destructive tests (compressive strength). The results of this data were analyzed in three different methods (Facaoaru - Belander - Galan) to confirm the compressive strength of the concrete using the combined method of non - destructive tests. The results showed that the estimate compressive by Facaoaru method gave almost identical results with the true compressive strength of the concrete with strength to less than 40 N / mm²، whereas the estimate compressive strength by Belander method gave higher results than the true compressive strength up to (30%). The estimate compressive strength by Galan method was significantly higher than the true compressive strength up to (15%).