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Effects of calcium leaching on diffusion properties of hardened and altered cement pastes

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Title: Effects of calcium leaching on diffusion properties of hardened and altered cement pastes
Authors: Kurumisawa, Kiyofumi Browse this author →KAKEN DB
Haga, Kazuko Browse this author
Hayashi, Daisuke Browse this author
Owada, Hitoshi Browse this author
Issue Date: Jun-2017
Publisher: Elsevier
Journal Title: Physics and Chemistry of the Earth, Parts A/B/C
Volume: 99
Start Page: 175
End Page: 183
Publisher DOI: 10.1016/j.pce.2017.03.007
Abstract: It is very important to predict alterations in the concrete used for fabricating disposal containers for radioactive waste. Therefore, it is necessary to understand the alteration of cementitious materials caused by calcium leaching when they are in contact with ground water in the long term. To evaluate the long-term transport characteristics of cementitious materials, the microstructural behavior of these materials should be considered. However, many predictive models of transport characteristics focus on the pore structure, while only few such models consider both, the spatial distribution of calcium silicate hydrate (C-S-H), portlandite, and the pore spaces. This study focused on the spatial distribution of these cement phases. The auto-correlation function of each phase of cementitious materials was calculated from two-dimensional backscattered electron imaging, and the three-dimensional spatial image of the cementitious material was produced using these auto-correlation functions. An attempt was made to estimate the diffusion coefficient of chloride from the three-dimensional spatial image. The estimated diffusion coefficient of the altered sample from the three-dimensional spatial image was found to be comparable to the measured value. This demonstrated that it is possible to predict the diffusion coefficient of the altered cement paste by using the proposed model.
Rights: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 胡桃澤 清文

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