STRUCTURE AND PROPERTIES OF HYDRATION OF DOPED DICALCIUM SILICATES  

作　　者：杨淑珍 宋汉唐 

机构地区：[1]Dept. of Material Science, Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》1992年第4期26-33,共8页武汉理工大学学报（材料科学英文版）

摘　　要：In this paper, several dicalcium silicates (β-C2S) obtained from impurities have been studied. A study of the structure and properties of these doped dicalcium silicates reveals that the doping with MgO of BaSO4 enhanced their activity and rate of hydration, K2O has a similar effect rough less pronounced.The lattice distortion and crystal size in β-dicalcium silicates are measured by X-ray powder diffraction technique, the binding energies of 2P3 for Ca and 2P for Si are obtained by X-ray photoelectric spectrum, the vibrations of the chemical bonds in silicate anion 〔SiO4〕4- are examined by FT-IR and Laser Raman spectra and the heat evolution during hydration reaction for β-dicalcium silicates are determined by microcalorimetry. From the results of XRD, XPS, FT-IR, Raman and micro- DSC, the relationship between the microstructure and properties of doped dicalcium silicates and the mechanism of activation due to impurities are discussed. It is pointed out that the essential factors causing the enhancement of activity and acceleration of hydration reaction are the lattice distortion, crystal size,intercrystalline imperfections, the crystallochemical environment change and chemical shifts of the electron binding energies of Ca and Si atoms in doped β-dicalcium silicates.In this paper, several dicalcium silicates (β-C2S) obtained from impurities have been studied. A study of the structure and properties of these doped dicalcium silicates reveals that the doping with MgO of BaSO4 enhanced their activity and rate of hydration, K2O has a similar effect rough less pronounced.The lattice distortion and crystal size in β-dicalcium silicates are measured by X-ray powder diffraction technique, the binding energies of 2P3 for Ca and 2P for Si are obtained by X-ray photoelectric spectrum, the vibrations of the chemical bonds in silicate anion 〔SiO4〕4- are examined by FT-IR and Laser Raman spectra and the heat evolution during hydration reaction for β-dicalcium silicates are determined by microcalorimetry. From the results of XRD, XPS, FT-IR, Raman and micro- DSC, the relationship between the microstructure and properties of doped dicalcium silicates and the mechanism of activation due to impurities are discussed. It is pointed out that the essential factors causing the enhancement of activity and acceleration of hydration reaction are the lattice distortion, crystal size,intercrystalline imperfections, the crystallochemical environment change and chemical shifts of the electron binding energies of Ca and Si atoms in doped β-dicalcium silicates.

关 键 词：Β-C2S DOPE Structure HYDRATION ACTIVITY 

分 类 号：TB3-55[一般工业技术—材料科学与工程]