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. In this work, two methods of NDT, rebound hammer and ultrasonic pulse velocity (UPV) are addressed, with the aim of obtaining simple and multiple correlation curves between concrete strength (fc) and measured through the said tests, rebound namber (R) and VPU, respectively. For that, cylindrical specimens were molded (150 x 300 mm) and blocks (300 x 400 x 600 mm) using four different types of concretes collected in different works of the city of Maringá during the concreting phase of the structure. The results obtained from the tests (rebound hammer, VPU and axial compression) performed on cylindrical specimens (CPs) and on concrete drilled cores (CTs) were correlated in order to obtain a mathematical model to estimate the strength of the concretes studied here. Simple correlations were established, based on results from a single NDT, as well as multiple correlations combining the results obtained with the two NDTs. The mathematical models obtained through the study developed here, especially those from the tests carried out in the CTs, can be applied to estimate the resistance of the analyzed concretes, since they present a strong correlation and errors that are limited in the 10% range.

revista tecnológica/revista tecnológica

ESCLEROMETRIA E VELOCIDADE DE PROPAGAÇÃO DO PULSO ULTRASSÔNICO PARA ESTIMATIVA DA RESISTÊNCIA À COMPRESSÃO DO CONCRETO POR MEIO DE CURVAS DE CORRELAÇÃO