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Effect of Calcium Leaching on Diffusivity of Blended Cement Paste and Mortar

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Title: Effect of Calcium Leaching on Diffusivity of Blended Cement Paste and Mortar
Authors: Kurumisawa, Kiyofumi Browse this author →KAKEN DB
Haga, Kazuko Browse this author
Shibata, Masahito Browse this author
Hayashi, Daisuke Browse this author
Issue Date: May-2021
Publisher: Japan Concrete Institute
Journal Title: Journal of advanced concrete technology
Volume: 19
Issue: 5
Start Page: 426
End Page: 432
Publisher DOI: 10.3151/jact.19.426
Abstract: Cement-based materials used at radioactive waste disposal sites are required to possess long-term stability. However, when these materials come in contact with groundwater, calcium leaching from the solid occurs, and the material becomes porous. The use of mineral admixtures is recommended to minimize porosity. However, few studies have focused on the diffusion performance of cement-based materials blended with mineral admixtures after leaching. Therefore, in this study, the diffusion performance of such materials using blended cement after leaching was evaluated. It was found that the diffusion coefficient of the blended cement increased with leaching, and when leaching progressed considerably, the diffusion coefficient of the blended cement was close to that of ordinary Portland cement. Furthermore, the diffusion coefficient after leaching demonstrated good correlation with the pore volume when the pore diameter was 50 nm or larger.
Type: article
URI: http://hdl.handle.net/2115/82187
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)

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