Influence of carbonation on the volume change of hardened cement pastes

被引：13
作者：
Li, Biyun [1 ,2 ]
Sun, Zhenping [1 ,2 ]
Hu, Kuangyi [1 ,2 ]
Yang, Jingbin [1 ,2 ]
机构：
[1] Tongji Univ, Sch Mat Sci & Engn, Shanghai 200092, Peoples R China
[2] Tongji Univ, Key Lab Adv Civil Engn Mat, Minist Educ, Shanghai 200092, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 260卷
基金：
中国国家自然科学基金;
关键词：
Hardened cement paste; Carbonation; Volume changes; Helium pycnometer; Fly ash; MICROSTRUCTURE; CONCRETE; DURABILITY; SHRINKAGE; HYDRATION;
D O I：
10.1016/j.conbuildmat.2020.119709
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Carbon dioxide uptake of hardened cement pastes and hardened cement pastes mixed with fly ash during carbonation cycles were investigated. The volume changes of that two series of hardened pastes on carbonation cycles were measured by the helium pycnometer. For further discussion, samples were analyzed by X-ray diffraction with RIR (Reference Intensity Ratio) method. The pH changes of those leaching solutions were also mentioned. Results showed the final trend of carbon dioxide uptake of two sample series was nearly the same, which was decreased to the identical uptake level. But there were differences in the volume changes of the two sample series. For the cement pastes, the volume change increased rapidly and then changed to gentle gradually. The volume change increased first, then reduced steadily as for the mixed pastes. However, the volume of hardened cement pastes was still expanded after 24-hour carbonation. Different trends of the volume changes might be due to the carbonation of not only the calcium hydroxide but the C-S-H (Calcium-Silicate-Hydrate). (C) 2020 Elsevier Ltd. All rights reserved.
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页数：8
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