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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

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.

Authors:
 [1];  [2]; ; ;  [1]; ;  [3];  [4]
  1. Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)
  2. Graduate School of Engineering, Kyoto University, Kyoto 611-8540 (Japan)
  3. Taiheiyo Consultant Co., Ltd., Ohsaku, Sakura 285-8655 (Japan)
  4. Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)
Publication Date:
OSTI Identifier:
22149355
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 42; Journal Issue: 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM COMPOUNDS; CAT SCANNING; CONCRETES; CRACKS; DEPOSITS; PERFORMANCE; PERMEABILITY; PRECIPITATION; RADIOACTIVE WASTES; WATER; X RADIATION

Citation Formats

Fukuda, Daisuke, Nara, Yoshitaka, E-mail: nara.yoshitaka.2n@kyoto-u.ac.jp, Kobayashi, Yuya, Maruyama, Megumi, Koketsu, Mayuko, Hayashi, Daisuke, Ogawa, Hideo, and Kaneko, Katsuhiko. Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT. United States: N. p., 2012. Web. doi:10.1016/J.CEMCONRES.2012.08.014.
Fukuda, Daisuke, Nara, Yoshitaka, E-mail: nara.yoshitaka.2n@kyoto-u.ac.jp, Kobayashi, Yuya, Maruyama, Megumi, Koketsu, Mayuko, Hayashi, Daisuke, Ogawa, Hideo, & Kaneko, Katsuhiko. Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT. United States. doi:10.1016/J.CEMCONRES.2012.08.014.
Fukuda, Daisuke, Nara, Yoshitaka, E-mail: nara.yoshitaka.2n@kyoto-u.ac.jp, Kobayashi, Yuya, Maruyama, Megumi, Koketsu, Mayuko, Hayashi, Daisuke, Ogawa, Hideo, and Kaneko, Katsuhiko. Thu . "Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT". United States. doi:10.1016/J.CEMCONRES.2012.08.014.
@article{osti_22149355,
title = {Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT},
author = {Fukuda, Daisuke and Nara, Yoshitaka, E-mail: nara.yoshitaka.2n@kyoto-u.ac.jp and Kobayashi, Yuya and Maruyama, Megumi and Koketsu, Mayuko and Hayashi, Daisuke and Ogawa, Hideo and Kaneko, Katsuhiko},
abstractNote = {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.},
doi = {10.1016/J.CEMCONRES.2012.08.014},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = 11,
volume = 42,
place = {United States},
year = {2012},
month = {11}
}