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- W3163226061 abstract "In cold regions, the highly supportive effect of concrete is particularly important to the safety of engineering construction. However, studies on the fracture debonding law and fracture criterion for rock–concrete binary composite interfaces under freeze–thaw (F-T) actions are relatively few. In this study, sandstone–concrete binary composite materials were considered as the research object. First, the debonding processes of the composites under F-T cycles were studied using nuclear magnetic resonance (NMR), stereoscopic microscope (SM) and scanning electron microscope (SEM) testing technology, and the distribution range of the interface influence zone (IIZ) was determined. In addition, the interface fracture criterion for sandstone-concrete composites under F-T actions was proposed, and the initiation law and influencing factors of interface cracks were discussed. The primary conclusions are as follows: (1) The IIZ, which has a thickness of approximately 12 mm, lies in the sandstone near the interface. Furthermore, the rock–concrete composite interface crack initiates and propagates mainly along the interface under F-T cycles, whereas it kinks into the IIZ at local positions. (2) Under F-T actions, the interface crack initiates along the material with the weaker mechanical properties or along the interface, and does not kink into the side of the material with the stronger mechanical properties. (3) The smaller the difference in mechanical properties between the materials on either side of the interface, the higher is the tendency for the interface crack to initiate and propagate along the interface. Moreover, the interface crack tends to kink into the material with the weaker mechanical property when there is a substantial difference in mechanical properties between the materials on either side. The study provides certain theoretical reference for further study of the debonding law of rock-concrete interface induced by F-T actions." @default.
- W3163226061 created "2021-05-24" @default.
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- W3163226061 date "2021-08-01" @default.
- W3163226061 modified "2023-10-01" @default.
- W3163226061 title "Sandstone-concrete interface debonding mechanism under freeze-thaw actions: Fracture process and fracture criterion" @default.
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- W3163226061 doi "https://doi.org/10.1016/j.conbuildmat.2021.123526" @default.
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