Evaluation of compressive strength of concrete using ultrasonic pulse velocity and electrical resistivity methods

Document Type : Research Paper

Authors

1 M.Sc. student, Department of Civil and Architectural Engineering, Malayer University

2 Assistant Professor, Department of Civil and Architectural Engineering, Malayer University

10.22124/jcr.2022.22227.1573

Abstract

Compressive strength of concrete is considered as one of its most important properties and usually gives an overview of the quality of concrete, because the strength depends directly on the microstructure of the cement paste. Evaluation of compressive strength of concrete is done by destructive and non-destructive methods. Non-destructive methods, with a much fewer number of tests, can provide a good estimate of the compressive strength of concrete. In this research, non-destructive ultrasonic pulse velocity and electrical resistivity methods were used to estimate the compressive strength of normal concrete tests with three different water-to-cement ratios, and mathematical models were proposed to estimate the compressive strength were compared. SPSS statistical software was used to analyze the test data. Different linear and nonlinear mathematical models related the relationship between the parameters of electrical resistivity, ultrasonic pulse velocity and compressive strength for each of the water-to-cement ratios as well as 28-day age were extracted by software to estimate the compressive strength. The results showed that the combination of ultrasonic pulse velocity and electrical resistivity methods for estimating compressive strength has a higher accuracy compared to one method alone. For this purpose, the modified form of the exponential function with a coefficient range of 0.63-0.83 and the mean absolute value of relative error 2.3-6.5% and the polynomial function with the range 0.63-0.89 and the mean absolute value of relative error is 3.2-7% had better performance.

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