超高性能混凝土-普通混凝土界面粘结性能研究

doi:10.11896/cldb.24020129

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Abstract Ultra-high performance concrete (UHPC) has significant advantages and great potential in the field of structural repair and reinforcement due to its excellent mechanical and durability properties.The bond performance of UHPC-normal concrete (NC) interface is very important for achieving a good reinforcement effect.Based on the oblique shear test,here analyzed the influence of UHPC strength and reinforcement thickness on the bond performance of UHPC-NC interface.The results show that the interface bond performance between post-cast UHPC and NC is excellent,and the failure modes of oblique shear specimens are mostly NC failure or simultaneous failure of interface and NC.The bond strength of UHPC-NC interface increases slightly with the increase of UHPC strength.The strength grade of UHPC increases from C100 to C140,and the interfacial bond strength of the specimen increases by 2.58 MPa (14.66%).The thickness of UHPC reinforcement has a more significant effect on the interfacial bond strength.The interfacial bond strength of the specimen with a thickness of 150 mm can be increased by 6.68 MPa (38%) compared with the specimen with a thickness of 75 mm.Based on the test results,a formula for calculating the shear strength of UHPC-NC interface considering the roughness of UHPC-NC interface,the strength of matrix NC,the strength and thickness of UHPC was established.The calculation results by the formula agree well with the test results.

Key words： ultra-high performance concrete normal concrete oblique shear test interface shear strength load-slip curve

Published: 10 April 2025 Online: 2025-04-10

CLC number:

TU528

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	Articles by authors
	WANG Yan
	CHANG Tianfeng
	YANG Zifan
	LI Yilan

Cite this article:

WANG Yan,CHANG Tianfeng,YANG Zifan, et al. Study on Shear Bond Performance of UHPC-NC Interface[J]. Materials Reports, 2025, 39(7): 24020129-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24020129 OR https://www.mater-rep.com/EN/Y2025/V39/I7/24020129

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