Evaluating Accuracy of Correlation Expressions from Literature for Estimation of Concrete Strength from Ultrasonic Pulse Velocity

Abstract

In this article, the strategy for evaluation of compressive strength of concrete from non-destructive and partially destructive testing on the existing structures or cubes is reviewed. It is essential for condition assessment and health monitoring of the existing structures to fulfil the requirements of periodic assessment, reviewing present structural health and condition of the structures. Among the non-destructive tests, ultrasonic pulse velocity (USPV) and rebound hammer (RHM) tests are normally used for qualitative assessment, whereas core test (semi-destructive) is used for quantitative strength assessment. Subsequently, the forms of correlation expression best suited for evaluation of compressive strength of concrete from USPV were ascertained from the correlation expressions of USPV and core strength from the literature. From the results, it was concluded that for the considered dataset, linear correlation model would be best suited for evaluation of concrete compressive strength from USPV. This study would be very useful as a reference for engineers engaged in condition assessment and re-evaluation exercises of existing concrete structures.