Dehydration Characteristics of C-S-H with Ca/Si Ratio 1.0 Prepared Via Precipitation |
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| Authors: | Yongjia He Xiaohui Zheng Linnü Lü Shumei Yu Gao Deng Shuguang Hu |
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| Affiliation: | 1.State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology),Wuhan,China;2.School of Materials Science and Engineering,Wuhan University of Technology,Wuhan,China;3.Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics (School of Science, Wuhan University of Technology),Wuhan,China |
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| Abstract: | Calcium silicate hydrate (C-S-H) with Ca/Si ratio 1.0 was prepared via precipitation in solution and heated at various temperatures to investigate its dehydration behavior. The dehydration, structural collapse and recrystallization characteristics of C-S-H and its microstructural change during heating process were investigated by XRD, SEM, Raman and TG-DSC techniques. C-S-H gradually lost non-evaporable water upon heating, about 50% and 80% non-evaporable water was removed below 200 and 400 °C, respectively, and the rest was removed up to about 1 000 °C. At 400 °C, dehydrated C-S-H exhibited the increasing disordering of calcium/silicon environment and the decreasing symmetrical bending vibration of Si-O-Si of Q2 silicate chains. At 650 °C non-bridging oxygen atoms (Onon) attached to silicon were almost removed, and significant structural change occurred, and at 815 °C C-S-H dehydrated to wollastonite. |
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