Compressive strength and elasticity module of concrete using non-destructive techniques (NDT)

ABSTRACT

The compressive strength of concrete and its modulus of elasticity are mechanical properties of fundamental importance in the design of new structures. For the case of existing structures that may need to be reformed, such as capturing existing concrete properties, they will be considered for the calculation of the load capacity of the structural element. The present research aims to present configurations for estimating concrete mechanical properties (compressive strength and modulus of elasticity) by means of non-destructive techniques (NTDs) and establishing correlation analyzes in concrete with nominal strength classes C20 to C50. For the elaboration of the test for the use of three non-destructive techniques, among them, the ultrasonic pulse velocity test (UPV), the rebound number (RN) and the acoustic response test (RA). In order to estimate compressive strength (f_c) and modulus (Ec), simple correlation forms were, RN x f_c and UPV x f_c and multiple UPV x RN x f_c. From the selected correlation, ISO-strength curves were drawn up, according to a methodology called SonReb. To calculate the static elastic modulus (E_d), he did a correlation study with the dynamic modulus (E_d). The results demonstrate that there is a relationship between, as well as the influence of the compressive strength of the concrete in determining the dynamic elastic modulus. An estimate of the properties of the concrete by means of correlation curves presents satisfactory results, where, as analytical equations, it found a smaller margin of error less than 10%.

Keywords
non-destructive tests; Rebound number; Ultrasonic Pulse Velocity; SonReb