Dehydration Characteristics of C-S-H with Ca/Si Ratio 1.0 Prepared Via Precipitation
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2018年第3期
论文作者：何永佳 ZHENG Xiaohui 吕林女 YU Shumei DENG Gao HU Shuguang
文章页码：619 - 624
摘 要：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 ℃, respectively, and the rest was removed up to about 1 000 ℃. At 400 ℃, 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 ℃ non-bridging oxygen atoms(Onon) attached to silicon were almost removed, and significant structural change occurred, and at 815 ℃ C-S-H dehydrated to wollastonite.
何永佳1,2，ZHENG Xiaohui1,2，吕林女3，YU Shumei1,2，DENG Gao1,2，HU Shuguang1,2
1. State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology)2. School of Materials Science and Engineering, Wuhan University of Technology3. Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics (School of Science, Wuhan University of Technology)
摘 要：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 ℃, respectively, and the rest was removed up to about 1 000 ℃. At 400 ℃, 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 ℃ non-bridging oxygen atoms(Onon) attached to silicon were almost removed, and significant structural change occurred, and at 815 ℃ C-S-H dehydrated to wollastonite.
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