Silicate Anion Structural Change in Calcium Silicate Hydrate Gel on Dissolution of Hydrated Cement
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概要
- 論文の詳細を見る
High pH conditions of aqueous solutions in a radioactive waste repository can be brought about by dissolution of cementitious materials. In order to clarify the mechanisms involved in maintaining this high pH for long time, we investigated the dissolution phenomena of OPC hydrate.In the present research, leaching tests on powdered cement hydrates were conducted by changing the ratio of mass of leaching water to mass of OPC hydrate (liquid/solid ratio) from 10∼2,000 (wt/wt). Ordinary Portland Cement hydrate was contacted with deionized water and placed in a sealed bottle. After a predetermined period, the solid was separated from the solution.From the results of XRD analysis on the solid phase and the Ca concentration in the aqueous phase, it was confirmed that Ca(OH)2 was preferentially dissolved when the liquid/solid ratio was 10 or 100 (wt/wt), and that C–S–H gel as well as Ca(OH)2 were dissolved when the liquid/solid ratio was 500 (wt/wt) or larger. 29Si-NMR results showed that the silicate anion chain of the C-S-H gel became longer when the liquid/solid ratio was 500 (wt/wt) or greater. This indicates that leaching of OPC hydrate results in a structural change of C–S–H gel.
- 社団法人 日本原子力学会の論文
- 2002-05-25
著者
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Nagasaki Shinya
The University Of Tokyo Graduate School Of Frontier Science Institute Of Environmental Studies
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Takagi Shunji
Mitsubishi Research Institute Inc.
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Sanami T
Department Of Quantum Science And Energy Engineering Tohoku University
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Tanaka Satoru
Department of Pediatrics, Graduate School of Medical and Dental Sciences, Kagoshima University
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NAGASAKI Shinya
Institute of Environmental Studies, Graduate School of Frontier Science, The University of Tokyo
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Tanaka S
Takasaki Research Establishment Japan Atomic Energy Research Institute
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Tanaka Satoru
Department Of Cardiovascular Medicine Gifu Pref. Govt. Tajimi Hospital
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Tanaka S
The University Of Tokyo Graduate School Of Engineering Department Of Quantum Engineering And Systems
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HAGA Kazuko
Taiheiyo Consultant Co., Ltd.
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SHIBATA Masahito
Taiheiyo Consultant Co., Ltd.
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HIRONAGA Michihiko
Central Research Institute of Electric Power Industry
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Haga K
Taiheiyo Consultant Co. Ltd.
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Nagasaki S
The University Of Tokyo Graduate School Of Frontier Science Institute Of Environmental Studies
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Shibata Masahito
Taiheiyo Consultant Co. Ltd.
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Tanaka Satoru
Department Of Anesthesiology Sapporo Medical University School Of Medicine
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