Crack Propagation and Failure Mechanism of Modeled Recycled Concrete under Shear Stress

Shijun Wang, Shengjiang Peng, Chang Sun, Amardeep Singh, Ziyun Cheng and Yunfei Tian
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Shijun Wang: Economic and Technical Research Institute of Gansu Electric Power Corp., State Grid, Lanzhou 730050, China
Shengjiang Peng: School of Economics and Management, North China Electric Power University, Beijing 102206, China
Chang Sun: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Amardeep Singh: Department of Civil Engineering and Architecture, Changzhou Institute of Technology, Changzhou 213032, China
Ziyun Cheng: Economic and Technical Research Institute of Gansu Electric Power Corp., State Grid, Lanzhou 730050, China
Yunfei Tian: Economic and Technical Research Institute of Gansu Electric Power Corp., State Grid, Lanzhou 730050, China

Sustainability, 2022, vol. 14, issue 9, 1-16

Abstract: In this study, the failure processes of modeled concrete specimens under shear force were studied. To investigate the cracks propagation and failure modes, modeled natural aggregate, modeled recycled aggregate, and modeled brick aggregate were used as coarse aggregate in the modeled concrete. Through digital image correlation (DIC) technology, the displacement field and strain field could be obtained by analyzing the change of the speckle position on the surface of the specimens. It was found that the shear strength of the modeled natural concrete (MNC) was the highest, the modeled recycled concrete (MRC) was the second, and the modeled brick aggregate concrete (MBC) was the lowest and only half of that of MNC. The shear crack of the MNC first appeared at the interface transition zone (ITZ) and propagated, resulting in the shear failure. The shear crack of MRC first appeared in the new ITZ and then expanded to the old ITZ. The shear crack of MBC extended through the brick aggregate. The study also found that, along with the compressive stress trace range, the MNC and the MRC have four vertical compressive strain concentration zones, while the MBC has only two strain concentration zones, which should result from the fact that the elastic modulus of the brick aggregate is lower than the surrounding hardened mortar. Therefore, there are no compressive strain concentration zones near the brick aggregate.

Keywords: modeled concrete; recycled aggregate; brick aggregate; digital image correlation; crack propagation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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