The bond properties between ultra-high-performance concrete and normal strength concrete substrate: Bond macro-performance and overlay transition zone microstructure

被引：39
|
作者：
Feng, Shuo [1 ,2 ,3 ]
Xiao, Huigang [1 ,2 ,3 ]
Liu, Rui [1 ,2 ,3 ]
Liu, Min [1 ,2 ,3 ]
机构：
[1] Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin 150090, Peoples R China
[2] Harbin Inst Technol, Key Lab Smart Prevent & Mitigat Civil Engn Disast, Minist Ind & Informat Technol, Harbin 150090, Peoples R China
[3] Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China
来源：
CEMENT & CONCRETE COMPOSITES | 2022年 / 128卷
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Concrete repair; UHPC repair materials; Hoop constraint method; Bond macro-performance; OTZ microstructure; FIBER; REPAIR; INTERFACE; DURABILITY; ROUGHNESS; BEHAVIOR; MODEL; UHPC; PERMEABILITY; PREDICTION;
D O I：
10.1016/j.cemconcomp.2022.104436
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study investigates the bond performance between ultra-high-performance concrete (UHPC) and normal strength concrete (NSC) substrate. A hoop constraint method is designed to assess the shrinkage effect of repair materials on bond macro-performance. The bond strength and permeability of the same specimen are determined using the hoop constraint method. Additionally, the properties of repair materials, such as drying shrinkage, thermal gravity analysis, and mercury intrusion porosimetry, were investigated. The overlay transition zone (OTZ) microstructure is analysed to reveal the bonding mechanism. The results indicate that the hoop constraint method effectively reflects the ability of UHPC to overcome the significant autogenous shrinkage effect and achieve good bond macro-performance. Moreover, the UHPC-combined substrate exhibits better bond strength than that of the NSC because the repair interface of the UHPC is more compact than that of the NSC. Furthermore, the OTZ width of the UHPC-combined substrate is narrower than that of the NSC, and in the OTZ, the modulus of the UHPC is higher than that of the NSC.
引用
收藏
页数：15
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