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Influence of Fracture Width on Sealability in High-Strength and Ultra-Low-Permeability Concrete in Seawater

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Title: Influence of Fracture Width on Sealability in High-Strength and Ultra-Low-Permeability Concrete in Seawater
Authors: Fukuda, Daisuke Browse this author →KAKEN DB
Nara, Yoshitaka Browse this author
Hayashi, Daisuke Browse this author
Ogawa, Hideo Browse this author
Kaneko, Katsuhiko Browse this author →KAKEN DB
Keywords: fracture
micro-focus X-ray CT
image subtraction
high-strength and ultra-low-permeability concrete
radioactive waste disposal
Issue Date: Jul-2013
Publisher: MDPI AG
Journal Title: Materials
Volume: 6
Issue: 7
Start Page: 2578
End Page: 2594
Publisher DOI: 10.3390/ma6072578
Abstract: For cementitious composites and materials, the sealing of fractures can occur in water by the precipitation of calcium compounds. In this study, the sealing behavior in a macro-fractured high-strength and ultra-low-permeability concrete (HSULPC) specimen was investigated in simulated seawater using micro-focus X-ray computed tomography (CT). In particular, the influence of fracture width (0.10 and 0.25 mm) on fracture sealing was investigated. Precipitation occurred mainly at the outermost parts of the fractured surface of the specimen for both fracture widths. While significant sealing was observed for the fracture width of 0.10 mm, sealing was not attained for the fracture width of 0.25 mm within the observation period (49 days). Examination of the sealed regions on the macro-fracture was performed using a three-dimensional image registration technique and applying image subtraction between the CT images of the HSULPC specimen before and after maintaining the specimen in simulated seawater. The temporal change of the sealing deposits for the fracture width of 0.10 mm was much larger than that for the fracture width of 0.25 mm. Therefore, it is concluded that the sealability of the fracture in the HSULPC is affected by the fracture width.
Type: article
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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