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Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT

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Title: Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT
Authors: Fukuda, Daisuke Browse this author →KAKEN DB
Nara, Yoshitaka Browse this author
Kobayashi, Yuya Browse this author
Maruyama, Megumi Browse this author
Koketsu, Mayuko Browse this author
Hayashi, Daisuke Browse this author
Ogawa, Hideo Browse this author
Kaneko, Katsuhiko Browse this author →KAKEN DB
Keywords: Self-sealing
Image analysis
Radioactive waste
High-Performance Concrete
micro-focus X-ray CT
image subtraction
high-strength and ultra-low-permeability concrete
Issue Date: Nov-2012
Publisher: Elsevier
Journal Title: Cement and Concrete Research
Volume: 42
Issue: 11
Start Page: 1494
End Page: 1500
Publisher DOI: 10.1016/j.cemconres.2012.08.014
Abstract: High-strength and ultra-low-permeability concrete (HSULPC) is thought to be useful as a radioactive waste package. Thus, a high confining ability is desirable. For cementitious materials, sealing of cracks may occur in water due to the precipitation of calcium compounds. This can affect the confining ability. In this study, the sealing of a crack in HSULPC in water was investigated using micro-focus X-ray computed tomography (CT). The sealing by precipitation occurred only around the end of the specimen. Sealed regions of the crack were identified using three-dimensional image registration and CT image subtraction of images obtained for the specimen before and after it was immersed in water to evaluate temporal changes of the sealing deposits in the crack. The sealing deposits increased as the HSULPC specimen was kept in water longer. It was concluded that cracks in HSULPC in water are sealed by precipitation.
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: 福田 大祐

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