Abstract
In this paper, we describe an experimental study of concrete behavior under a uniaxial tensile load by use of the thermally-compensated Coda Wave Interferometry (CWI) analysis. Under laboratory conditions, uniaxial tensile load cycles are imposed on a cylindrical concrete specimen, with continuous ultrasonic measurements being recorded within the scope of bias control protocols. A thermally-compensated CWI analysis of multiple scattering waves is performed in order to evaluate the stress-induced velocity variation. Concrete behavior under a tensile load can then be studied, along with CWI results from both its elastic performance (acoustoelasticity) and plastic performance (microcracking corresponding to the Kaiser effect). This work program includes a creep test with a sustained, high tensile load; the acoustoelastic coefficients are estimated before and after conducting the creep test and then used to demonstrate the effect of creep load.
Highlights
Concrete is the most widely used man-made construction material in the world [1]
This stress-induced damage is a common reason behind concrete deterioration, and the detection of stress-induced damage is a major problem encountered in the non-destructive testing of concrete
The bias-controlled Coda Wave Interferometry (CWI) result, aF, presents the stress-induced velocity variation in relative percentage (%) terms as: aF = Dv/v0, where v0 is the propagation velocity in the initial state when the concrete is intact and stress-free, and Dv refers to velocity changes from v0
Summary
Concrete is the most widely used man-made construction material in the world [1]. It has been extensively used for several decades in the field of civil engineering. Previous studies [9,10] have shown that the nature of concrete, i.e. as a quasi-fragile material, makes it damaged by the applied stress, which could cause changes in propagation velocity. This stress-induced damage is a common reason behind concrete deterioration, and the detection of stress-induced damage is a major problem encountered in the non-destructive testing of concrete
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