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In situ time-resolved X-ray diffraction of tobermorite formation process under hydrothermal condition: Influence of reactive al compound

Published online by Cambridge University Press:  05 March 2012

K. Matsui ,
A. Ogawa ,
J. Kikuma ,
M. Tsunashima ,
T. Ishikawa  and
S. Matsuno
K. Matsui*
Affiliation:
Asahi-KASEI Construction Materials Corporation, Ibaraki, Japan
A. Ogawa
Affiliation:
Asahi-KASEI Construction Materials Corporation, Ibaraki, Japan
J. Kikuma
Affiliation:
Analysis and Simulation Center, Asahi-KASEI Corporation, Shizuoka, Japan
M. Tsunashima
Affiliation:
Analysis and Simulation Center, Asahi-KASEI Corporation, Shizuoka, Japan
T. Ishikawa
Affiliation:
Analysis and Simulation Center, Asahi-KASEI Corporation, Shizuoka, Japan
S. Matsuno
Affiliation:
Analysis and Simulation Center, Asahi-KASEI Corporation, Shizuoka, Japan
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

Hydrothermal formation reaction of tobermorite in the autoclaved aerated concrete (AAC) process has been investigated by in situ X-ray diffraction. High-energy X-rays from a synchrotron radiation source in combination with a newly developed autoclave cell and a photon-counting pixel array detector were used. XRD measurements were conducted in a temperature range 100–190°C throughout 12 h of reaction time with a time interval of 4.25 min under a saturated steam pressure. To clarify the tobermorite formation mechanism in the AAC process, the effect of Al addition on the tobermorite formation reaction was studied. As intermediate phases, non-crystalline calcium silicate hydrate (C-S-H), hydroxylellestadite (HE), and katoite (KA) were clearly observed. Consequently, it was confirmed that there were two reaction pathways via C-S-H and KA in the tobermorite formation reaction of Al containing system. In addition, detailed information on the structural changes during the hydrothermal reaction was obtained.

Keywords

in situ time-resolved XRDhydrothermal formationautoclaved aerated concretetobermorite
Type
Technical Articles
Information
Powder Diffraction , Volume 26 , Special Issue 2 , June 2011 , pp. 134 - 137
Copyright
Copyright © Cambridge University Press 2011

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References

Grutzeck, M. W. (2005). in Cellular Ceramics, edited by Scheffler, M. and Colombo, P. (Wiley-VCH, Weinheim), pp. 193–223. 10.1002/3527606696.ch2iGoogle Scholar
Houston, J. H., Maxwell, R. S., and Carroll, S. A. (2009). “Transformation of meta-stable calcium silicate hydrates to tobermorite: Reaction kinetics and molecular structure from XRD and NMR spectroscopy,” Geochem. Trans. GETRF9 10, 1. 10.1186/1467-4866-10-1CrossRefGoogle ScholarPubMed
Kikuma, J., Tsunashima, M., Ishikawa, T., Matsuno, S., Ogawa, A., Matsui, K., and Sato, M. (2009). “Hydrothermal formation of tobermorite studied by in-situ X-ray diffraction under autoclave condition,” J. Synchrotron Radiat. JSYRES 16, 683–686. 10.1107/S0909049509022080Google Scholar
Kikuma, J., Tsunashima, M., Ishikawa, T., Matsuno, S., Ogawa, A., Matsui, K., and Sato, M. (2010). “In situ time-resolved X-ray diffraction of tobermorite formation process under autoclave condition,” J. Am. Ceram. Soc. JACTAW 93, 2667–2674. 10.1111/j.1551-2916.2010.03815.xCrossRefGoogle Scholar
Larosa-Thompson, J. L. and Grutzeck, M. W. (1996). “C-S-H, tobermorite, and coexisting phases in the system CaO–Al2O3–SiO2–H2O,” World Cem. WOCEDR 27, 69–74.Google Scholar
Merlino, S., Bonaccorsi, E., and Armbruster, T. (1999). “Tobermorite: Their real structure and order-disorder (OD) character,” Am. Mineral. AMMIAY 84, 1613–1621.CrossRefGoogle Scholar
Mitsuda, T., Sasaki, K., and Ishida, H. (1992). “Phase evolution during autoclaving process of aerated concrete,” J. Am. Ceram. Soc. JACTAW 75, 1858–1863. 10.1111/j.1151-2916.1992.tb07208.xGoogle Scholar
Taylor, H. F. W. (1997). Cement Chemistry, 2nd ed. (Thomas Telford, London), pp. 113–156. 10.1680/cc.25929Google Scholar