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Title: Precipitation of calcium compounds onto rock surfaces in water with cementitious material
Authors: Nara, Yoshitaka  kyouindb  KAKEN_id  orcid (unconfirmed)
Kashiwaya, Koki  kyouindb  KAKEN_id  orcid (unconfirmed)
Nakao, Akimasa
Uchida, Hiroto
Hamada, Yusaku
Shibuya, Kazutoshi
Author's alias: 奈良, 禎太
柏谷, 公希
中尾, 尭雅
内田, 紘人
Keywords: Precipitation
Calcium compound
Scanning electron microscope
Energy dispersion X-ray spectroscopy
Issue Date: Sep-2019
Publisher: Springer
Journal title: Carbonates and Evaporites
Volume: 34
Issue: 3
Start page: 1003
End page: 1020
Abstract: In this study, the precipitation of minerals onto rock surfaces was investigated to consider whether sealing of pores and cracks in rock can be accelerated. Cylindrical specimens were prepared and then kept in purified water with powders of high-strength and ultra-low-permeability concrete (HSULPC), which will be used to confine transuranic wastes in Japan. Then, the rock specimens were weighed and the surfaces of rock specimens were inspected under a microscope. It was recognized that precipitation occurred on the surface of the rock specimens. It was also shown that precipitation did not occur on rock specimens kept in water without HSULPC. The weight of all specimens stored in HSULPC increased, and the observed weight change was larger for rocks with higher porosities. It is concluded that precipitation of minerals occurs on the rock surface when the rock is kept in water with HSULPC powders. From the results obtained in this study, it is suggested that the sealing of pores and cracks in rock can be accelerated by the precipitation of calcium compounds using HSULPC. It is concluded that HSULPC is useful for underground radioactive waste disposal.
Rights: This is a post-peer-review, pre-copyedit version of an article published in 'Carbonates and Evaporites'. The final authenticated version is available online at:
The full-text file will be made open to the public on 22 September 2019 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1007/s13146-018-0471-9
Appears in Collections:Journal Articles

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