Effects of Carbonation on Micro Structures of Hardened Cement Paste

查看全文 作　　者：[1]柳俊哲;yao [1]senyuan;ba [1]mingfang;he [1]zhimin;[1]李玉顺

机构地区：[1]Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》索引2016年第31卷第1期,共5页

基　　金：Funded by K.C.Wong Magna Fund in Ningbo University;the National Natural Science Foundation of China(Nos.51278255,51478227);Ningbo Municipal Science and Technology Project(Nos.2013C51006,2015A610300) 摘　　要：In order to investigate the effects of carbonation on the microstructure of cement concrete,the carbonation depth and microstructure of cement paste with 0.3,0.4 and 0.5 water/cement ratio after 7,14,21 and 28 d accelerated carbonation were studied respectively.The results showed that with the increase of waterto-cement ratio and carbonation age,the carbonation depth was deepened with faster early carbonation speed and slower later carbonation rate.Carbonation densified the structure of hardened cement stone with refinement of pore structure and reduced porosity.Then,during the carbonation process from the surface to the inside of carbonation area,it was prone to form micro-cracks extending to the interior specimen,resulting in cement paste carbonation depth uneven.It is further illustrated that the color reaction method using phenolphthalein solution combined with X-CT and X-ray diffraction analysis is much more reasonable to evaluate the cement concrete carbonation degree.Moreover,during carbonation process sulfur element in cement paste migrated to the area un-carbonated and the concentrated shape of sulfur element is consistent with the coloring region in carbonation interface.Finally it was identified that carbonation not only reduced the p H value in cement concrete but also made prone to crack in carbonation zone,which increased the probability of reinforcement corrosion. 关键词：硬化水泥浆体碳化深度微观结构水泥混凝土 X射线衍射分析碳化过程非碳酸饮料碳化速度

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Effects of Carbonation on Micro Structures of Hardened Cement Paste

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