Effects of calcined layered double hydroxides on carbonation of concrete containing fly ash

被引：32
作者：
Duan, Ping [1 ,2 ]
Yan, Chunjie [1 ,2 ]
Zhou, Wei [1 ,2 ]
机构：
[1] China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Hubei, Peoples R China
[2] China Univ Geosci, Minist Educ, Engn Res Ctr Nanogeomat, Wuhan 430074, Hubei, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 160卷
基金：
中国国家自然科学基金;
关键词：
Layered double hydroxides; Carbonation; Pore solution; Fly ash; ACCELERATED CARBONATION; NUCLEOSIDE MONOPHOSPHATES; CEMENTITIOUS MATERIALS; PORTLAND-CEMENT; SLAG; INTERCALATION; RESISTANCE; SULFATE; PERFORMANCE; CHEMISTRY;
D O I：
10.1016/j.conbuildmat.2017.11.099
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Carbonation resistance of fly ash blended concrete incorporating LDHs was investigated. X-ray diffraction, IR-spectroscopy and thermal analysis were employed to characterize the component and structural changes of LDHs and cement paste before and after carbonation. Carbonation depths were assessed using the TG-DSC method combining the results obtained from phenolphthalein indicator. The presence of C-O as a basis for determining the presence of CaCO3 was detected using IR-spectroscopy. The relationships between pH values of pore solution and carbonation depth were discussed. The experimental results show that LDHs can catch CO2 and fix them in concrete. LDHs, especially the calcined LDHs, enhances the carbonation resistance of concrete. Test results of TG-DSC indicate that there exists a sharp carbonation boundary. The TG-DSC result uncovers that the carbonation depth is twice of that determined by phenolphthalein indicator. A linear relationship was found between the carbonation depth and pH values of pore solution. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：725 / 732
页数：8
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