再生混凝土-超高性能混凝土不同粗糙程度后浇节点试件剪力传递机理研究

doi:10.11896/cldb.24110017

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Abstract The shear performance of recycled aggregate concrete(RAC) - ultra-high performance concrete(UHPC) post-cast node specimens were investigated through direct shear tests. The failure modes and crack propagation patterns under direct shear were analyzed. The influence of interfacial roughness on the shear transfer performance was investigated, and the shear transfer mechanism was further explored. Test results indicated that for specimens with linear(L-type) joints, the specimens with very rough interfaces(L-S-N) exhibit at least one crack propagating away from the interface. In contrast, specimens with generally rough interfaces(L-R-N) and untreated interfaces(L-C-N) exhibit interfacial crac-king, with cracks propagating along the interface. The load-displacement curves of all specimens display an initial linear ascending branch corresponding to elastic behavior, followed by an abrupt load drop, characteristic of brittle shear failure. The average ultimate shear stress of the L-R-N and L-S-N specimens increased by 35% and 116%, respectively, compared to that of the L-C-N specimens. All L-typed specimens with diffe-rent interfacial roughness experienced interfacial bond failure, with the maximum horizontal strain being 2 to 3 times greater than that in the other directions. The findings demonstrate that interfacial roughness has a significant impact on the shear transfer performance of RAC-UHPC post-cast node specimens. Increased interfacial roughness significantly improves shear resistance, promoting the high-performance use of recycled concrete in structural applications.

Key words： recycled aggregate concrete ultra-high performance concrete roughness of surface failure mode shear transfer

Published: 25 March 2026 Online: 2026-04-03

CLC number:

TU528.31

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	Articles by authors
	SUN Chang
	LUO Yijing
	WANG Zonghao
	ZHAO Haiye
	LIU Qiong
	PAN Feng

Cite this article:

SUN Chang,LUO Yijing,WANG Zonghao, et al. Study on Shear Transfer Mechanism of RAC-UHPC Post-cast Node Specimens with Different Interfacial Roughness[J]. Materials Reports, 2026, 40(6): 24110017-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24110017 OR https://www.mater-rep.com/EN/Y2026/V40/I6/24110017

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