Investigation for estimating of concrete strength by the maturity method and the rebound hammer test

Abstract

Estimating the in-situ strength of the concrete is an important factor in planning the execution of reinforced concrete structures. The evaluation of the concrete characteristics development can be based on different methods-maturity methods, temperature-matched curing, rebound hammer testing, ultrasonic pulse velocity and other. The recent article presents the results of an experimental study to determine the compressive strength of the concrete in test specimens by a maturity method based on ASTM C1074-19e1 and a rebound hammer test according to BDS EN 13791/NA and BDS EN 12504-2. The maturity calculation are based on temperature measurements taken at a depth of 10 mm below the surface of the test specimens. Calculations were also performed to assess the compressive strength according to FIB Model Code 2010. The obtained results are compare with the actual concrete strength established by testing cubic test specimens, cured on site. Furthermore, there was found a very high correlation between the values of the compressive strength, calculated by maturity method based on ASTM C1074-19e1 and the rebound hammer test according to BDS EN 13670/NA and BDS EN 12504-2.