Durability of coral aggregate concrete under coupling action of sulfate, chloride and drying-wetting cycles

被引:29
作者
Huang, Daguan [1 ]
Niu, Ditao [2 ]
Su, Li [3 ]
Pan, Du [2 ,4 ]
Liu, Yunhe [1 ]
机构
[1] Xian Univ Technol, Sch Civil Engn & Architecture, Xian, Peoples R China
[2] Xian Univ Architecture & Technol, Coll Civil Engn, Xian, Peoples R China
[3] Lanzhou Univ Technol, Sch Civil Engn, Lanzhou, Peoples R China
[4] Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Clearwater Bay, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
Sulfate attack; Chloride; Drying-wetting; Coral aggregate concrete; Coupling action; COMPRESSIVE STRENGTH; ATTACK; MICROSTRUCTURE;
D O I
10.1016/j.cscm.2022.e01003
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper investigates the deterioration progress of coral aggregate concrete (CAC) under the coupling action of sulfate, chloride and drying-wetting cycles. Three strength grades (C25, C30, C40) of CAC specimens were designed for experimental analysis. In addition, ordinary aggregate concrete (OAC) specimens were prepared as the reference group. The relative dynamic elastic modulus and the relative compressive strength of CAC increases first and then decreases with increasing exposure time, while the mass loss rate shows the opposite trend. The CAC with high strength grade has strong corrosion resistance, and the corrosion resistance of CAC is obviously lower compared to OAC at same strength grade. The addition of basalt fiber into CAC can delay the cracking and maintain the integrity. With increasing exposure time, the damage depth increases exponentially. The chloride concentration can be divided into two phases: first increase and then decrease. Basalt fiber can significantly reduce the chloride diffusion coefficient of CAC. The erosion products are ettringite and gypsum for OAC and CAC; in addition, Friedel's salt is also found in CAC.
引用
收藏
页数:13
相关论文
共 30 条
[1]   Durability of metakaolin concrete to sulfate attack [J].
Al-Akhras, Nabil M. .
CEMENT AND CONCRETE RESEARCH, 2006, 36 (09) :1727-1734
[2]   Study of compressive strength characteristics of coral aggregate concrete [J].
Arumugam, RA ;
Ramamurthy, K .
MAGAZINE OF CONCRETE RESEARCH, 1996, 48 (176) :141-148
[3]   Long-term testing of the chloride-penetration resistance of concrete containing high-reactivity metakaolin [J].
Boddy, A ;
Hooton, RD ;
Gruber, KA .
CEMENT AND CONCRETE RESEARCH, 2001, 31 (05) :759-765
[4]  
Chen Z.L., 1991, OCEAN ENG, V9, P67
[5]   Durability and microstructure of coral sand concrete incorporating supplementary cementitious materials [J].
Cheng, Shukai ;
Shui, Zhonghe ;
Sun, Tao ;
Yu, Rui ;
Zhang, Guozhi .
CONSTRUCTION AND BUILDING MATERIALS, 2018, 171 :44-53
[6]   Chloride diffusion study of coral concrete in a marine environment [J].
Da, Bo ;
Yu, Hongfa ;
Ma, Haiyan ;
Tan, Yongshan ;
Mi, Renjie ;
Dou, Xuemei .
CONSTRUCTION AND BUILDING MATERIALS, 2016, 123 :47-58
[7]   Phase changes of salts in porous materials: Crystallization, hydration and deliquescence [J].
Espinosa, Rosa Maria ;
Franke, Lutz ;
Deckelmann, Gernod .
CONSTRUCTION AND BUILDING MATERIALS, 2008, 22 (08) :1758-1773
[8]   Concrete Deterioration Mechanisms under Combined Sulfate Attack and Flexural Loading [J].
Gao, Rundong ;
Li, Qingbin ;
Zhao, Shunbo .
JOURNAL OF MATERIALS IN CIVIL ENGINEERING, 2013, 25 (01) :39-44
[9]  
[高润东 Gao Rundong], 2010, [土木工程学报, China Civil Engineering Journal], V43, P48
[10]  
[关虓 Guan Xiao], 2021, [铁道学报, Journal of the China Railway Society], V43, P175