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Received: 2009-04-27

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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.9 P.1334-1340


Correlation between 29Si polymerization and cementitious activity of coal gangue

Author(s):  Ji-xiu ZHANG, Heng-hu SUN, Yin-ming SUN, Na ZHANG

Affiliation(s):  Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Corresponding email(s):   zhangjixiu06@mails.tsinghua.edu.cn

Key Words:  Degree of polymerization, Relative bridging oxygen number (RBO), Nuclear magnetic resonance (NMR), Coal gangue, Cementitious activity

Ji-xiu ZHANG, Heng-hu SUN, Yin-ming SUN, Na ZHANG. Correlation between 29Si polymerization and cementitious activity of coal gangue[J]. Journal of Zhejiang University Science A, 2009, 10(9): 1334-1340.

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A1 - Yin-ming SUN
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DOI - 10.1631/jzus.A0920237

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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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