Next Article in Journal
A Review of Luminescent Anionic Nano System: d10 Metallocyanide Excimers and Exciplexes in Alkali Halide Hosts
Previous Article in Journal
Structural Polymer-Based Carbon Nanotube Composite Fibers: Understanding the Processing–Structure–Performance Relationship
Open AccessArticle

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

1
Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
2
Graduate School of Engineering, Kyoto University, Kyoto Daigaku Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
3
Taiheiyo Consultant Co., Ltd., Ohsaku, Sakura, Chiba 285-8655, Japan
*
Author to whom correspondence should be addressed.
Present address: Radioactive Waste Management Funding and Research Center, 1-15-7, Tsukishima, Chuo-ku, Tokyo 104-0052, Japan
Materials 2013, 6(7), 2578-2594; https://doi.org/10.3390/ma6072578
Received: 27 March 2013 / Revised: 17 June 2013 / Accepted: 19 June 2013 / Published: 25 June 2013
(This article belongs to the Section Advanced Composites)
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. View Full-Text
Keywords: fracture; self-sealing; micro-focus X-ray CT; image subtraction; high-strength and ultra-low-permeability concrete; radioactive waste disposal fracture; self-sealing; micro-focus X-ray CT; image subtraction; high-strength and ultra-low-permeability concrete; radioactive waste disposal
Show Figures

Figure 1

MDPI and ACS Style

Fukuda, D.; Nara, Y.; Hayashi, D.; Ogawa, H.; Kaneko, K. Influence of Fracture Width on Sealability in High-Strength and Ultra-Low-Permeability Concrete in Seawater. Materials 2013, 6, 2578-2594.

Show more citation formats Show less citations formats

Article Access Map by Country/Region

1
Only visits after 24 November 2015 are recorded.
Back to TopTop