The role of shear interlock effect of CA on the pre-peak cracking of UHPC-CA

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2025-03-07 DOI:10.1016/j.engfracmech.2025.111024

Tengfeng Geng, Baozhen Luo, Yu Zhang, Ziying Chen, Shaohua Li

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引用次数: 0

Abstract

Coarse aggregate (CA) can mitigate the shrinkage of Ultra-High Performance Concrete (UHPC), however, the pre-peak cracking process of UHPC containing CA (UHPC-CA) under mixed tensile-shear loading remains unclear. Herein, microcracking, mesoscale fracture and macroscale cracking resistance are quantified with the aim to clarify the role of CA on the pre-peak cracking mechanism of UHPC-CA. The results show that, as shear stress proportion increases, a localized strain concentration appears along CA, exhibiting a shear interlock effect of CA. Based on the integrated machine learning based acoustic emission mode classification, more shear microcracking events are detected. Moreover, higher shear proportion results in a higher fracture across CA at the mesoscale and a mineral crystal fracture mode transformation, from intergranular fracture to transgranular fracture, at the microscale. As a result, CA leads to a delayed initiation of full-developed fracture process zone and larger fracture energy, consequently, higher cracking resistance of UHPC-CA under mixed tensile-shear loading.

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.