Bond performance of reinforcing bars in fly ash-based engineered geopolymer composites under uniform and nonuniform corrosion conditions

被引:0
|
作者
Ling, Yifeng [1 ]
Tan, Yuxiang [2 ,3 ]
Liu, Qifang [4 ]
Shi, Weizhuo [2 ,3 ]
Yang, Bo [5 ]
机构
[1] Shandong Univ, Dept Qilu Transportat, Jinan, Peoples R China
[2] Univ Nottingham Ningbo China, Dept Civil Engn, Taikang Rd 199, Ningbo 315100, Peoples R China
[3] Univ Nottingham Ningbo China, New Mat Inst, Ningbo 315100, Peoples R China
[4] Shandong Univ, Dept Civil Engn, Jinan, Peoples R China
[5] Iowa State Univ, Civil Construct & Environm Engn, Ames, IA 50011 USA
来源
CEMENT & CONCRETE COMPOSITES | 2024年 / 152卷
关键词
Engineered geopolymer composites; Pull-out test; Bond strength; Uniform and nonuniform corrosion; Alkali activator; Fly ash; CHLORIDE-INDUCED CORROSION; STEEL REINFORCEMENT; INDUCED CRACKING; CONCRETE; STRENGTH; HYDRATION; PATTERNS; REBAR; SLAG;
D O I
10.1016/j.cemconcomp.2024.105680
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
While concrete is the most popular building material in the world, corrosion of the steel reinforcement in reinforced concrete (RC) structures poses ongoing durability issues. In this study, the effects of alkali activator modulus, concentration, and different corrosion periods are rigorously investigated utilizing accelerated electrochemical corrosion techniques under both uniform and nonuniform corrosion conditions. Bond stress and bond stress deterioration are evaluated to provide a thorough examination of corrosion-induced fracture formation through pull-out experiments. X-CT 3D imaging is also used to understand the spread of rust in both corrosion scenarios. Results show that mixes with lower alkali activator modulus and higher alkali activator concentration might result in better bond stress preservation and higher ultimate bond stress under corrosion. High bond stress, however, usually corresponds to a more brittle failure when subjected to pull-out force. Nonuniform corrosion treatment can result in differential rust formation and a quicker bond breakdown between steel bars and engineered geopolymer composites (EGCs) than uniform corrosion. Furthermore, under corrosion, EGCs with high alkali activator modulus tend to form more penetrating cracks with limited width and depth. Both narrow and deep penetrating fractures can arise from EGCs with low alkali activator concentration.
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收藏
页数:19
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