岩石–混凝土界面黏结强度冻融劣化模型及试验分析

doi:10.13722/j.cnki.jrme.2019.1037

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Abstract In this paper，starting from the interface bonding mechanism of “geological body—engineering body”binary media materials，the control indexes affecting the bonding performance of rock-concrete interface were explored，and the theoretical characterization of the interface bonding strength of binary media was constructed. Then，a bond strength freeze-thaw degradation model of rock-concrete interface was proposed through the internal cognition of the degradation process of the interface bonding performance under freeze-thaw. For further verifying the accuracy and evaluation effect of the proposed model，shear tests of interface-bonding performance with different interface roughness (JRC) and freeze-thaw cycles were carried out on granite-concrete binary samples，and it is shown that the test results are consistent with the theoretical calculations. The model comprehensively considers the interface apparent characteristics，concrete C-S-H group “root pile” effect and freeze-thaw damage deterioration characteristics，and provides a theoretical reference for understanding freeze-thaw deterioration of rock-concrete interface bond strength. Additionally，in order to thoroughly cognize the cause of the error between the freeze-thaw deterioration theoretical model of the interface bond properties and the measured values，further discusses were carried out about wall strength distribution coefficient，characteristics of interface failure morphology analysis，NMR layered microscopic analysis technology and coupling characteristics of interface bond strength freeze-thaw deterioration，which expands the cognitive depth of interface bond properties deterioration induced by freeze-thaw. The research results can provide theoretical and experimental basis for evaluating the deterioration of bond strength between rock and concrete caused by freeze-thaw.

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	Articles by authors
	SHEN Yanjun1
	2
	WEI Xin3
	YANG Gengshe3
	WANG Yongzhi3
	JIA Hailiang3
	ZHANG Huan3
	ZHANG Huimei4

Cite this article:

SHEN Yanjun1,2,WEI Xin3, et al. Freeze-thaw degradation model and experimental analysis of rock-concrete interface bond strength[J]. , 2020, 39(3): 480-490.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1037 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I3/480

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