【摘 要】
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The influences of alkali oxides doping on the crystal structure, defects and hydration behavior of tricalcium silicate C3S were investigated by X-ray powder
【机 构】
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State Key Laboratory of Green Building Materials, China Building Materials Academy, No.1 Guanzhuang
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
The influences of alkali oxides doping on the crystal structure, defects and hydration behavior of tricalcium silicate C3S were investigated by X-ray powder diffraction with the Rietveld method, inductively coupled plasma optical emission spectroscopy, thermoluminescence(TL) and isothermal calorimetry.Samples with different kinds and concentrations of alkalis but the same polymorphic form (T1 form) has been successfully produced.Changes in the crystal structure of C3S could mainly be monitored by changes in lattice parameters,which are correlated with the concentration and substitution types of alkalis.Despite the fact that the content of alkalis remaining in C3S is quite low, TL and hydration behavior of C3S are significantly influenced.The initial hydration activity is dramatically increased and highly related to the intensity of the irradiation-induced TL peaks at low temperatures due to their direct correlation with defects.The oxygen vacancy sites resulting from the substitution of alkalis for Ca could readily account for the acceleration of the initial hydration of C3S.
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