High.temperature Phase Transition and the Activity of Tobermorite

The high-temperature phase transition of tobermofite was investigated by TGA/DSC, X-ray diffraction and Infrared spectroscopy （IR）, respectively. The experimental results showed that Si-OH bonds were cleaved at 724℃ and dehydroxylation occured at the same time, implying that the crystal structure of...

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Bibliographic Details
Published in:武汉理工大学学报：材料科学英文版 2014 (2), p.298-301
Main Author: YANG Xiuli CUI Chong CUI Xiaoyu TANG Guodong MA Hailong
Format: Article
Language:English
Subjects:
X-射线衍射
反应活性
晶体结构
水解活性
离子含量
红外光谱
雪硅钙石
高温相变
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Summary:The high-temperature phase transition of tobermofite was investigated by TGA/DSC, X-ray diffraction and Infrared spectroscopy （IR）, respectively. The experimental results showed that Si-OH bonds were cleaved at 724℃ and dehydroxylation occured at the same time, implying that the crystal structure of tobermorite was broken. As a result, the dehydroxylatiun tobermorite was metastable state, exhibiting obviously hydrolysis activity. The suspension was alkaline and Ca^2＋ ions content reached a maximum value 4.76% after heat treatment at 724℃. The dehydroxylation tobermorite had potential reactive activity due to the strong hydrolysis activity. The disordered structure recombined to wollastonite, and the crystal structure became ordering and stable at 861℃. Finally, 2M-wollastonite structure can be found in the sample as the temperature reached up to 1 000℃.
ISSN:1000-2413
1993-0437