Chloride binding of synthetic Ca-Al-NO3 LDHs in hardened cement paste

被引：150
作者：
Chen, Yuxuan [1 ,2 ]
Shui, Zhonghe [1 ]
Chen, Wei [1 ,2 ]
Chen, Guowei [1 ,2 ]
机构：
[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
[2] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2015年 / 93卷
基金：
中国国家自然科学基金;
关键词：
Ca-Al-NO3; LDHs; Chloride binding; Simulated pore solution; Cement paste; LAYERED DOUBLE HYDROXIDES; INDUCED REINFORCEMENT CORROSION; AFM PHASE; HYDROCALUMITE; SULFATE; PRECIPITATION; HYDROTALCITE; CARBONATION; ADSORPTION; CONCRETE;
D O I：
10.1016/j.conbuildmat.2015.05.047
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The chloride binding of synthetic Ca-Al-NO3 layered double hydroxides (LDHs) for the removal of chloride ions from pore solution of cementitious materials is studied. The Ca-Al-NO3 LDHs is synthesized and characterized by XRD, SEM, FT-IR and XRF analysis. Results of direct anion exchange tests show that chloride substitutes nitrate in the interlayer of Ca-Al-NO3 LDHs in aqueous solution and the adsorption model fits the Langmuir adsorption isotherm. Furthermore, the structural change of Ca-Al-NO3 LDHs in simulated pore solution and its transformation after binding chloride are investigated. Cement pastes with Ca-Al-NO3 LDHs are prepared with chloride solution. Microstructural analysis shows that the Ca-Al-NO3 LDHs can immobilize the chlorides in the hardened cement pastes. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1051 / 1058
页数：8
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