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

Fukuda, Daisuke; Nara, Yoshitaka; Hayashi, Daisuke; Ogawa, Hideo; Kaneko, Katsuhiko

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

Fukuda, Daisuke; Nara, Yoshitaka; Hayashi, Daisuke et al.

Materials, 2013, 6(7), 2578-2594

Permalink : https://hdl.handle.net/2115/53123

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アクセス権	open access
URI	https://hdl.handle.net/2115/53123
タイトル	Influence of Fracture Width on Sealability in High-Strength and Ultra-Low-Permeability Concrete in Seawater
著者	Fukuda, Daisuke ; Nara, Yoshitaka ; Hayashi, Daisuke ; Ogawa, Hideo ; Kaneko, Katsuhiko
e-Rad_Researcher 80647181 著者名 Fukuda, Daisuke
著者名 Nara, Yoshitaka
著者名 Hayashi, Daisuke
著者名 Ogawa, Hideo
e-Rad_Researcher 20128268 著者名 Kaneko, Katsuhiko
言語	英語
キーワード	fracture
	self-sealing
	micro-focus X-ray CT
	image subtraction
	high-strength and ultra-low-permeability concrete
	radioactive waste disposal
発行日	2013-07
出版者	MDPI AG
収録物名	Materials
巻(号)	6(7)
ページ	2578-2594
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 3.0 Unported
PISSN	1996-1944
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.3390/ma6072578