Influence of seawater and sea sand on the performance of Anti-washout underwater concrete: The overlooked significance of Mg2+

被引:13
作者
Xiao, Shunmin [1 ]
Zhang, Ming [1 ]
Zou, Dujian [1 ]
Liu, Tiejun [1 ]
Zhou, Ao [1 ]
Li, Ye [1 ]
机构
[1] Harbin Inst Technol, Sch Civil & Environm Engn, Shenzhen 518055, Peoples R China
基金
中国国家自然科学基金;
关键词
Anti-washout underwater concrete (AWC); Anti-washout admixture (AWA); Seawater; Sea sand; Mechanical properties; Microstructure; Magnesium ion; MIXTURE COMPOSITION; MOLECULAR-DYNAMICS; DURABILITY; ADMIXTURES; HYDRATION; WASHOUT; WATER; POLYACRYLAMIDE; FLOCCULATION; STRENGTH;
D O I
10.1016/j.conbuildmat.2023.130932
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Seawater and sea sand are widely used in marine concrete to overcome the shortage of freshwater and river sand. However, the effect of the various salts in seawater and sea sand on the performance of anti-washout underwater concrete (AWC) is unclear. In this study, the influence of seawater and sea sand, as well as the aggressive ions in seawater, on the anti-washout ability, mechanical performance, and microscopic structure of AWC mortar are studied systematically. The AWC mortar molded in seawater has a lower compressive strength even though its indicators of anti-washout ability perform better than that in freshwater. This is because Mg2+ in seawater chemically binds with OH- in cement to form Mg(OH)2 film absorbed by anti-washout admixture(AWA), which inhibits the release of substances in AWC while also introducing more defects in AWC. This study lays the foundation for promoting the application of seawater and sea sand AWC in marine engineering.
引用
收藏
页数:12
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