Experimental Investigation of Interfacial Bond Behavior Between Non-autoclave Curing Ultra-high Performance Concrete and Existing Normal Concrete
WU Chen1,*, CHU Fuwei1, GONG Mingzi2, ZENG Zhipan3
1 Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fujian University of Technology, Fuzhou 350118, China 2 CCCC First Highway Xiamen Engineering Co., Ltd., Xiamen 361021, Fujian, China 3 Fujian Provincial Institute of Architectural Design and Research Co., Ltd., Fuzhou 350001, China
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.
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2023, Vol. 37 
