doi:10.3850/978-981-08-7920-4_S2-S61-cd

ABSTRACT

In this paper, a new elastic-wave-based NDT system was developed to reveal the defects inside concrete structures by imaging. It integrates the point-source/point-receiver scheme with the SAFT method to achieve results like scanned with a phase array system; hence it is equipped with large functioning depth because of high-energy feature that transient elastic wave method possessed over traditional ultrasonic method. To evaluate the feasibility of this system on NDT for concrete structures, a concrete slab with artificial void inside were built for experiment. The 2D plane stress FEM numerical simulations were performed for further comparison. Experimental result shows good agreement with the numerical result not only on the B-scan diagram but also on the processed scanning image. The elastic-wave-based NDT systemproposed in this paper exhibits high potential in inspecting the defects of in-situ concrete structures by imaging for civil engineering applications.

Keywords: NDT, Elasticwave, Image, Concrete.

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