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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.7 No.2
- 발행연도
- 2013.6
- 수록면
- 119 - 125 (7page)
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초록· 키워드
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Carbonation is a natural ageing process for cement. This study focuses on how the carbonation rate varies with selected hydration times and atmospheric conditions during the early stages of reacting dried cement paste. Diffuse reflection Fourier transform infrared spectroscopy is shown to be a suitable technique to monitor the formation of carbonates in cement. Combined with a previously developed freeze drying technique, carbonation can be studied at specific hydration stages. In ambient air both calcium hydroxide and calcium silicate hydrate (C?S?H) in cement are carbonated. Increased hydration time enhances the carbon dioxide uptake, which indicates that the calcium in the hydration products reacts more easily than the calcium in the clinker phase. In a humid CO₂ atmosphere, the carbonation process is so pronounced that it decomposes C?S?H into calcium carbonate and silica. In a moist N₂ atmosphere no carbonation occurs, but the sulfate chemistry of the cement seems to be affected due to the formation of ettringite.
목차
Abstract
1. Introduction
2. Method
3. Results
4. Discussion
5. Conclusions
References
참고문헌 (25)
참고문헌 신청
Andersen, F. A. / 1991 / Infrared spectra of amorphous and crystalline calcium carbonate / Acta Chemica Scandinavica 45:1018~1024
Bjo¨ rnstro¨m, J. / 2005 / Influence of nano-silica and organic admixtures on cement hydration: A mechanistic investigation
Clarkson, J. R. / 1992 / Role of metastable phases in the spontaneous precipitation of calcium carbonate. Journal of the Chemical Society / Faraday Transactions 88(2):243~249
Coleyshaw, E. E. / 2003 / Vibrational spectra of the hydrated carbonate minerals ikaite, monohydrocalcite, lansfordite and nesquehonite / Spectrochimica Acta Part A 59:2231~2239
Delgado, A. H. / 1996 / Comparison of IR techniques for the characterization of construction cement minerals and hydrated products / Applied Spectroscopy 50(8):970~976
Bjo¨ rnstro¨m, J. / 2005 / Influence of nano-silica and organic admixtures on cement hydration: A mechanistic investigation
Clarkson, J. R. / 1992 / Role of metastable phases in the spontaneous precipitation of calcium carbonate. Journal of the Chemical Society / Faraday Transactions 88(2):243~249
Coleyshaw, E. E. / 2003 / Vibrational spectra of the hydrated carbonate minerals ikaite, monohydrocalcite, lansfordite and nesquehonite / Spectrochimica Acta Part A 59:2231~2239
Delgado, A. H. / 1996 / Comparison of IR techniques for the characterization of construction cement minerals and hydrated products / Applied Spectroscopy 50(8):970~976
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UCI(KEPA) : I410-ECN-0101-2014-530-002741257