A non-destructive testing method of concrete composite slabs based on GPR and PAUT

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (20) : 318-324.

SUN Zhaolin, YANG Lu, MA Yuefei, LIU Meiyu

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Abstract

A nondestructive testing method combining ground-penetrating radar (GPR) and phased-array ultrasonic testing (PAUT) was proposed to address the difficulty of detecting defects on the bonding surface of concrete composite slabs. In order to verify the validity of the method, and to study the influence of reinforcement on the detection method, a single-layer reinforced composite slab and a double-layer reinforced truss composite slab were designed and fabricated. On the bonding surface, three types of artificial defects were set: delamination, voids and debris. The detection results showed that the method can effectively detect all defect types with accurate defect localization. The relative errors of detecting the size of defects were below 20%, and the average errors of detecting two specimens were 8% and 6.6%, respectively; the relative errors of detecting the depth of defects were below 10%, and the average errors of detecting two specimens were 4.3% and 4.8%, respectively. This method is an effective and accurate method for detecting defects in the bond surface of concrete composite slabs.

Key words

Concrete Composite Slab / Bonding surface defects / Concealed Work / Ground Penetrating Radar / Phased-Array Ultrasonic Testing / Non-Destructive Testing

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SUN Zhaolin, YANG Lu, MA Yuefei, LIU Meiyu. A non-destructive testing method of concrete composite slabs based on GPR and PAUT[J]. Journal of Vibration and Shock, 2024, 43(20): 318-324

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