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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: matsui.kj@om.asahi-kasei.co.jp
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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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