【摘要】 本文采用导热量热法、TGA、DTA、化学分析、原子吸收光谱分析及SEM/EDXA等方法研究了掺CaCO₃后C₃S水化速度及显微结构等的变化。发现C₃S水化随着CaCO₃的细度与掺量的提高而加速。部分CaCO₃参与了反应,C-S-H的Ca/Si比略有提高。CaCO₃颗粒表面生长着C-S-H和CH,对C₃S水化起了晶核作用。更多还原

【Abstract】 Tricalcium silicate was hydrated in the presence of calcium carbonate as a fine filler. The rate of hydration and the microstructural characteristics are studied by means of conductive calorimetry, TGA, DTA, SEM/EDXA and atomic adsorption spectrophotometer etc. Addition of CaCO₃ accelerated the hydration of C₃S and the effect increased with the amount added and fineness of calcium carbonate. Part of CaCO₃ was incorporated into C-S-H phase. The Ca/Si ratio of C-S-H is increased slightly.Examination by SEM/EDXA indicated that the hydrate products grow on the surface of calcium carbonate particles acting as crystal nuclei. Orowth of hydrates would decrease the concentration of ions in the solution phase and accelerate their transfer from the C₂S surface to the solution, and as a result, accelerate C₃S hydration.更多还原