Journal
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
Volume 10, Issue 9, Pages 1334-1340Publisher
ZHEJIANG UNIV
DOI: 10.1631/jzus.A0920237
Keywords
Degree of polymerization; Relative bridging oxygen number (RBO); Nuclear magnetic resonance (NMR); Coal gangue; Cementitious activity
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Funding
- National Natural Science Foundation of China [50674062]
- Key Projects in the National Science & Technology Pillar Program [2006BAC21B03]
- Beijing Science and Technology Plan Projects of China [D07040300690000]
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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 Si-29 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.
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