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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (9): 1334-1340    DOI: 10.1631/jzus.A0920237
Energy and Chemical Engineering     
Correlation between 29Si polymerization and cementitious activity of coal gangue
Ji-xiu ZHANG, Heng-hu SUN, Yin-ming SUN, Na ZHANG
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract  A new method for estimating the degree of [SiO4]4−polymerization of coal gangue is presented. The method uses the relative bridging oxygen number (RBO) based on nuclear magnetic resonance (NMR) techniques. X-ray diffraction (XRD) and 29Si NMR techniques have been used to study phase transitions and silicate polymerization of coal gangue calcined at different temperatures or co-calcined. It has been found that phase transition of clay minerals causes silicate polymerization to change with temperature. In this study, cementing activity and RBO were determined to be inversely related. Generally, activated coal gangue with lower RBO had better cementitious activity.

Key words： Degree of polymerization      Relative bridging oxygen number (RBO)      Nuclear magnetic resonance (NMR)      Coal gangue      Cementitious activity     
Received: 27 April 2009     
CLC:  TD98  
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Yin-ming SUN
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Cite this article:

Ji-xiu ZHANG, Heng-hu SUN, Yin-ming SUN, Na ZHANG. Correlation between 29Si polymerization and cementitious activity of coal gangue. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(9): 1334-1340.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0920237     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I9/1334

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