Test Study on Interfacial Bonding Behavior of UHPC-NC in a Chloride Environment

被引：2
作者：
Xie J. [1 ,2 ,3 ]
Yang Y. [1 ,2 ]
Chen Y. [4 ]
Yang R. [1 ,2 ]
机构：
[1] School of Civil Engineering, Tianjin University, Tianjin
[2] Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin
[3] Beijing Engineering Research Center of Existing Building Renovation(Tianjin Branch), Tianjin
[4] Shanghai Architectural Design and Research Institute Co.，Ltd., Shanghai
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2024年 / 57卷 / 01期
基金：
中国国家自然科学基金;
关键词：
bond-slip model; chloride environment; interface treatment; interfacial bonding behavior; normal concrete; ultra-high performance concrete;
D O I：
10.11784/tdxbz202211027
中图分类号：
学科分类号：
摘要：
A chloride environment is a commonly used chemical attack environment. Investigating the interfacial durability between ultra-high performance concrete(UHPC)and normal concrete(NC)in a chloride environment is essential for potential engineering applications of UHPC reinforced concrete structures and UHPC-NC composite structures. Consequently，the effects of dry-wet cycles(0，25，and 50)，salt immersion days(0，50，and 100 d)，and different treatment methods(brushing，water-jet，and roughed with retarders)on the bonding strength，bonding stiffness，and bond-slip relationships were obtained based on push-out test results of UHPC-NC specimens in conventional and chloride environments. The results show that the loss rate of bonding strength caused by dry-wet cycles and salt immersion is not more than 20% during the test period of 100 d. In addition，the increased duration in a chloride environment leads to a decrease in bonding stiffness. With the increase in interface roughness，the bonding strength and bonding stiffness of UHPC-NC specimens，as well as the interfacial resistance to salt immersion，increase. Influenced by the interface treatment，the load-slip curves of UHPC-NC specimens in a chloride environment show two forms，corresponding to smooth interface(brushing)and other interfaces(water-jet and roughed with retarders). Before the load reached the peak，the bond-slip curves of each specimen were found to be consistent. After the peak value，the former has a load-holding section after a sudden drop in load，whereas the latter has a load-decreasing section with the increase of the slip. Finally，a bond-slip model was proposed based on the characteristics of UHPC-NC bond-slip curves. © 2024 Tianjin University. All rights reserved.
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页码：11 / 20
页数：9
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