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Study on the influence of microcracks of coarse aggregate with specific particle size on crushing strength

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Abstract

The relationship between the microcracks of a single particle and the crushing strength was studied by virtual experiments. The three-dimensional profile of a single particle was obtained by CT-scanning technology. The particle bonding model is used to fill the three-dimensional contour to construct virtual particles, and the virtual crushing experiment is carried out by discrete element method. The rationality of the parameters used in the contact model and the reliability of the virtual crushing test results are determined from the perspective of the macroscopic crushing condition of a single particle and the force–displacement curve. The loading speed of the virtual crushing test is set to 0.01 m/s. The influence of microcracks on the Weibull distribution of crushing strength is considered from three aspects: quantity, location and direction. The characteristic strength of Weibull distribution of basalt particles is positively correlated with the number of microcracks. The Weibull modulus of the five groups of virtual particles with different numbers of microcracks is less than 14.5, indicating that the strength distribution of the virtual particles is more discrete. Compared with the microcrack angle, the position of the microcrack has a greater influence on the crushing strength of the particles.

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All data, models, and code generated or used during the study appear in the published article.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 52078132) and the Scientific Research Foundation of Graduate School of Southeast University. The authors gratefully acknowledge their financial support. In addition, thank you to all the authors in the following references.

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Correspondence to Yongli Zhao.

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Li, Z., Liu, B., Han, D. et al. Study on the influence of microcracks of coarse aggregate with specific particle size on crushing strength. Comp. Part. Mech. 11, 705–719 (2024). https://doi.org/10.1007/s40571-023-00648-0

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  • DOI: https://doi.org/10.1007/s40571-023-00648-0

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