Abstract
The ultrasonic testing (UT) has been successfully utilized in many civil engineering fields (e.g. steel structures, RC structures, PC structures, highway, and railway) since the UT can provides an efficient and convenient on-site inspection of internal and external defects. However, many influential factors, such as aggregate, grading, mortar and cement porosity, may introduce various uncertainties to the UT measurement in the concrete due to its highly heterogeneities. Herein, the aggregate in concrete is one of the most influential factors of heterogeneities. To understand the influence of the aggregate on the mechanism of elastic wave propagation is essential to increase the detectability of UT in concrete. Meanwhile, it can provide the supportive evidence of detection, which can increase the reliability. In this paper, a two-dimensional concrete model with consideration of stochastic distribution of aggregate is established numerically. The influence of the quantity of concrete coarse/fine aggregate on ultrasonic attenuation is studied. It was found that the distributed condition of aggregate affects the propagation velocity and attenuation of ultrasonic wave in concrete. Therefore, the reliability of UT test depends on the UT frequency and aggregate.
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