期刊
CEMENT AND CONCRETE RESEARCH
卷 52, 期 -, 页码 190-195出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2013.07.003
关键词
Calcium-Silicate-Hydrate (C-S-H); Characterization; Spectroscopy; Degradation; Long-Term Performance
资金
- Agency for Natural Resources and Energy of the Ministry of Economy, Trade and Industry (METI) of Japan
- Ministry of Education, Culture, Sports, Science and Technology
- Grants-in-Aid for Scientific Research [24656317, 25420565] Funding Source: KAKEN
In this report, X-ray photoelectron spectroscopy (XPS) and Si-29-MAS-NMR was used for the evaluation of deteriorated hardened cement pastes. The deterioration by ammonium nitrate solution was accompanied by changes in the pore structure as well as by structural changes in the C-S-H in the hardened cement paste. The CaO/SiO2 ratio of the C-S-H decreased with the progress of deterioration, there was also polymerization of the silicate in the C-S-H. It was confirmed that the degree of polymerization of silicate of the C-S-H in hardened cement paste can be determined by XPS. It was also shown that the polymerization depends on the structure of the C-S-H. (C) 2013 Elsevier Ltd. All rights reserved.
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