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Effect of particle distribution on the shear behavior of recycled concrete aggregate

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Abstract

Recycled concrete aggregate is an environment-friendly and economical civil engineering material. The concrete blocks in a construction waste dump were crushed and screened to attain recycled concrete aggregate with different particle distributions. A series of monotonic direct shear tests were conducted through large direct shear apparatus to analyze the influence of different particle distributions on the shear characteristics of recycled concrete aggregate. Results show that during the shearing process, the various particle distribution samples experienced shear contraction then dilatation with the gradual increase of shear displacement. Shear strength of recycled concrete aggregate was optimal when the coefficient of uniformity was 13.67 and the coefficient of curvature was 2.44. An increase in normal stress led to an increase in the shear stress of each particle distributions. With the increasing of normal stress, the shear contraction of the shear surface increased, but dilatancy decreased. Under the same particle distribution, when the shear strength was maximized, shear dilatancy was also maximized. As the content of fine particles was increased, the apparent adhesion first decreased and then increased, while the internal friction angle first increased and then decreased. Multiple test results demonstrated that the effect of shear rate on shear characteristics is not obvious on the shear characteristics of the recycled concrete aggregate. An empirical formula for the dilatancy coefficient is established to describe the dilatancy characteristics of the recycled concrete aggregate quantitatively under different particle distributions and normal stresses.

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Funding

This research was supported by the National Natural Science Foundation of China (grant number 51978534), the Zhejiang Province Natural Foundation projects of China (grant number LR18E080001), and the Key Research and development program of Zhejiang Province (grant number 2018C03038). This financial support is gratefully acknowledged.

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Correspondence to Long Wang.

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The authors that they have no competing interests.

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Responsible Editor: Zeynal Abiddin Erguler

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Zhu, W., Wang, J., Wang, L. et al. Effect of particle distribution on the shear behavior of recycled concrete aggregate. Arab J Geosci 15, 979 (2022). https://doi.org/10.1007/s12517-022-10166-7

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  • DOI: https://doi.org/10.1007/s12517-022-10166-7

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