Diffusion of Chlorine Ion in Hardened Cement Paste
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- GOTO Seishi
- Faculty of Engineering, Tokyo Institute of Technology
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- TSUNETANI Masami
- Faculty of Engineering, Tokyo Institute of Technology Asahi-Dow Ltd.
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- YANAGIDA Hiroaki
- Faculty of Engineering, Tokyo Institute of Technology Asahi Chemical Industry Co., Ltd.
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- KONDO Renichi
- Faculty of Engineering, Tokyo Institute of Technology
Bibliographic Information
- Other Title
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- セメント硬化体中の塩素イオンの拡散
- セメント コウカタイチュウ ノ エンソ イオン ノ カクサン
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Description
The transportation phenomena of Cl- ion in hardened portland cement paste were described. The reaction of the hydrated cements or cement minerals with NaCl solution was studied and the distribution of Cl- ion concentration in hardened cement paste immersed in artificial sea water was measured. The diffusion of Cl- ion in hardened cement paste was discussed and the following results were obtained.<br>It was found that C3AH6 reacted considerably with NaCl solution but even if the concentration of solution was high as 20wt% the conversion was not complete. It was also found that the hydrates of C4AF reacted with NaCl solution but the amount of reacted Cl- ion was about half of C3AH6. The amount of reacted Cl- ion with C3S hydrates was very little. In the case of hydrated cement the amount of reacted Cl- ion could be calculated additively from the composition of cement.<br>The distribution of Cl- ion concentration in hardened cement paste agreed with calculation obtained from Fick's law, and an apparent diffusion coefficient of 3.8×10-8cm2⋅s-1 was obtained, An apparent diffusion coefficient of 3.4×10-8cm2⋅s-1 was calculated from the penetration depth of Cl- ion which was measured by means of colorimetry with fluorescein sodium salt and silver nitrate. In consideration of the reaction of Cl- ion with hydrate, diffusion coefficient was calculated as 2.3×10-7cm2⋅s-1. It was suggested that the value obtained in this way should better represent the real process. The diffusion of Cl- ion was faster when the cement was immersed in MgCl2 solution than in NaCl solution. It was made sure that the diffusion of Cl- ion in hardened cement paste was affected by the accompanying cation species.
Journal
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- Journal of the Ceramic Association, Japan
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Journal of the Ceramic Association, Japan 87 (1003), 126-133, 1979
The Ceramic Society of Japan
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Details 詳細情報について
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- CRID
- 1390282680194311552
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- NII Article ID
- 110002316262
- 10019324448
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- NII Book ID
- AN00245650
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- ISSN
- 18842127
- 00090255
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- NDL BIB ID
- 2047385
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed