Microstructure of Hydrated Cement Paste Under Load and Aggressive Environment Coupling Effects

 

Tao Sun

Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, P.R China
*Corresponding auth
e-mail: sunt@whut.edu.cn

Xinping Li

Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, P.R China

Zhonghe Shui

School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P.R China

Weiwei Han

Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, P.R China

 

 ABSTRACT

Cement-based materials were often in service with coupling aggressive environments, which were always combined with loads, but researches about this lacked more reports. In this study, in order to study the characteristics of hydrated cement paste under load and aggressive environment coupling effects, XRD analysis, SEM microstructure, TG technique and polarized light microscopy were employed to evaluate the properties of hydrated cement paste. The results showed that: when imposed bending load on hydrated cement pastes, the bending load promoted the cement paste hydration but not changed the kinds of hydration products; Ca (OH)2 grain sizes (tension zone) were larger than ones in compression zone and blank zone, and total Ca (OH)2 content (compression zone) was bigger than others whatever was natural state or carbonation state; thirdly, the degree of cement paste hydration in natural state was bigger than in carbonation state, and the bending load prevented hydration and carbonation of cement paste in carbonation state with the better effects of tensile stress than compressive stress.

Keywords: Carbonation; hydrated cement paste; aggressive environment; coupling effects.

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