免蒸养超高性能混凝土-既有混凝土界面粘结性能试验研究

doi:10.11896/cldb.23010119

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Abstract Non-autoclave curing ultra-high performance concrete(UHPC)has excellent properties such as ultra-high strength and ultra-durability under normal curing. It is noted that, in strengthening normal concrete(NC)structure, the bonding property of UHPC-NC interface is an important factor to ensure the good performance of non-autoclave curing UHPC. In order to study the bonding properties of non-autoclave curing UHPC-NC interface, this paper designed the direct shear tests to analyze the influences of non-autoclave curing UHPC ages, NC strengths, NC surface treatments and interface binders. Furthermore, this paper proposed the bond-slip constitutive model of non-autoclave curing UHPC-NC interface. In addition, this paper presented the relative stiffness coefficient for further study. Experimental results show that:the failure modes of the interface for non-autoclave curing UHPC-NC specimens can be divided into bonding interface failure, bonding interface and NC failure, NC failure, and both NC and UHPC failure; compared with the specimens with roughing, the specimens with grooves have the obvious cracking stage and higher bond strength as well as ductility. Furthermore, the maximum bond strength increased 183.7%; when SiKa 32LP structural adhesive was used at the interface, specimens’ bond strength was 4.91 MPa, which was 2 times than that with another structural adhesive. As a result, when the non-autoclave curing UHPC is used to strengthen the NC member, it is recommended to groove the NC surface and use SiKa 32LP structural adhesive.

Key words： non-autoclave curing ultra-high performance concrete (UHPC) bond property direct shear test loading-slip relationship curve bond-slip constitutive model

Published: Online: 2023-12-19

CLC number:

U444

Fund:National Natural Science Foundation of China(52378494), Fujian Province Higher Education Industry Cooperation Project(2022H6032), and Fujian Province Guiding Science and Technology Plan Project(2021H0032).

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	Articles by authors
	WU Chen
	CHU Fuwei
	GONG Mingzi
	ZENG Zhipan

Cite this article:

WU Chen,CHU Fuwei,GONG Mingzi, et al. Experimental Investigation of Interfacial Bond Behavior Between Non-autoclave Curing Ultra-high Performance Concrete and Existing Normal Concrete[J]. Materials Reports, 2023, 37(24): 23010119-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23010119 OR http://www.mater-rep.com/EN/Y2023/V37/I24/23010119

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