Experimental Research on Fracture Properties of Mixed Mode Ⅰ-Ⅱ Concrete-Epoxy Mortar Interface

HANG Zhenyuan; YU Ying

doi:10.13204/j.gyjzG22113007

Volume 53 Issue 2

Feb. 2023

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HANG Zhenyuan, YU Ying. Experimental Research on Fracture Properties of Mixed Mode Ⅰ-Ⅱ Concrete-Epoxy Mortar Interface[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(2): 29-36. doi: 10.13204/j.gyjzG22113007

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HANG Zhenyuan, YU Ying. Experimental Research on Fracture Properties of Mixed Mode Ⅰ-Ⅱ Concrete-Epoxy Mortar Interface[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(2): 29-36. doi: 10.13204/j.gyjzG22113007

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Experimental Research on Fracture Properties of Mixed Mode Ⅰ-Ⅱ Concrete-Epoxy Mortar Interface

doi: 10.13204/j.gyjzG22113007

HANG Zhenyuan^1,2,
YU Ying^{2
,
,}

1. College of Road & Bridge, Zhejiang Institute of Communication, Hangzhou 311112, China;
2. Department of Civil and Environment Engineering, Shantou University, Shantou 515000, China

Received Date: 2022-11-30
Available Online: 2023-05-25
Publish Date: 2023-02-20

Abstract

Abstract

In order to analyze the effects of concrete strength and interface roughness on the crack propagation and fracture properties of mixed mode Ⅰ-Ⅱ concrete-epoxy mortar interface, four-point shear tests were conducted on 15 specimens, and the displacement and strain fields of the specimens were obtained by digital image correlation (DIC) technology. The fracture energy, ductility index and the stress intensity factors of mode Ⅰ and mode Ⅱ at the crack tip were calculated based on the linear-elastic fracture mechanics theory and fracture initiation toughness of mode Ⅰ measured by tests. The test results showed that the crack propagated along the interface, which belonged typical quasi-brittle failure. The fracture performance of the interface could be significantly enhanced through increasing the concrete strength, however, there was little effect of the concrete strength on the ratio of the stress intensity factors of mode Ⅰ and mode Ⅱ. The fracture performance, stress field at the crack tip, and failure angle of the specimen was relevant to the interface roughness. As increased from 0 mm to 0.31 mm, 0.97 mm, fracture energy G_u increased by 16.1% and 66.9%, ductility index G_u increased by 5.4% and 27.6% respectively, the ratio of the stress intensity factors of mode Ⅰ and mode Ⅱ decreased by 11.96% and 39.7%, and the failure angle increased by 11.9% and 37.8%, respectively.
- concrete,
- epoxy mortar,
- roughness,
- fracture performance,
- stress intensity factors

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References(23)

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