Axial Tensile Test of Wet-Screened Concrete Based on Digital Image Correlation and Acoustic Emission

SHI Zhen-xiang; CHEN Xu-dong; ZHANG Zhong-cheng; GUO Yu-zhu; ZHAO Wei-zhong; SUN Cheng-fei

doi:10.11988/ckyyb.20220818

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (1) : 175-182. DOI: 10.11988/ckyyb.20220818

Hydraulic Structure and Material

Axial Tensile Test of Wet-Screened Concrete Based on Digital Image Correlation and Acoustic Emission

SHI Zhen-xiang¹, CHEN Xu-dong¹, ZHANG Zhong-cheng¹, GUO Yu-zhu¹, ZHAO Wei-zhong², SUN Cheng-fei²

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Abstract

To investigate the crack development behavior of wet-screened concrete under uniaxial tensile test at various loading rates (1×10^-6、5×10^-6、25×10^-6 s^-1), a combination of acoustic emission (AE) and digital image correlation (DIC) was utilized to monitor the wet-screened concrete specimens in real time. Displacement-load curves, acoustic emission signals and crack location under different loading rates were obtained. The findings revealed that in the axial tensile process, the cumulative energy within the specimen increased with increasing loading rate, and the damage index of the specimen developed linearly. Meanwhile, the fracture of the specimens was mostly due to the failure of the surface between coarse aggregate and cementitious material, accompanied by the destruction of coarse aggregate. The fracture location of the aggregate highly corresponded with the AE energy signal. As the loading rate increased, the proportion of the primary crack displacement to the axial displacement of the specimen increased significantly, indicating a considerable strain concentration within the specimen.

Key words

wet screened concrete / uniaxial tension / digital image correlation / acoustic emission / damage identification

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SHI Zhen-xiang, CHEN Xu-dong, ZHANG Zhong-cheng, GUO Yu-zhu, ZHAO Wei-zhong, SUN Cheng-fei. Axial Tensile Test of Wet-Screened Concrete Based on Digital Image Correlation and Acoustic Emission[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(1): 175-182 https://doi.org/10.11988/ckyyb.20220818

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