STRUCTURE AND PROPERTIES OF HYDRATION OF DOPED DICALCIUM SILICATES

【摘要】 <正> In this paper,several dicalciumsilicates（β-C₂S）obtained from impuritieshave been studied.A study of the structureand properties of these doped dicalciumsilicates reveals that the doping with MgO ofBaSO₄ enhanced their activity and rate ofhydration,K₂0 has a similar effect roughless pronounced.The lattice distortion and crystal size inβ-dicalcium silicates are measured by X-raypowder diffraction technique,the bindingenergies of 2P³ for Ca and 2P for Si areobtained by X-ray photoelectric spectrum,thevibrations of the chemical bonds in silicateanion [SiO₄]_4- are examined by FT-IR andLaser Raman spectra and the heat evolutionduring hydration reaction for β-dicalciumsilicates are determined by microcalorimetry.From the results of XRD,XPS,FT-IR,Raman and micro-DSC,the relationshipbetween the microstructure and properties ofdoped dicalcium silicates and the mechanismof activation due to impurities are discussed.更多还原

【Abstract】 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.更多还原