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本文采用了导热量热法、DSC、TGA、DTA、SEM—EDXA 以及 X-射线分析等方法研究了 C_3A-CaSO_4·2H_2O-CaCO_3-H_2O 及 C_3S-CaCO_3-H_2O 等系统的水化和显微结构特征。发现 CaCO_3明显加速了C_3A 与石膏的反应,首先形成钙矾石,石膏提前耗尽。在钙矾石向低硫型硫铝酸钙转变的同时碳铝酸钙明显生成。细分散的 CaCO_3还加速了 C_3S的水化并随掺量增加而加快。水化产物生长在碳酸钙颗粒表面,对 C_3S 水化起晶核作用并改善了界面粘结。
In this paper, the hydration and microstructure of C_3A-CaSO_4·2H_2O-CaCO_3-H_2O and C_3S-CaCO_3-H_2O and other systems were studied by the methods of thermal calorimetry, DSC, TGA, DTA, SEM-EDXA and X-ray analysis. feature. CaCO_3 was found to significantly accelerate the reaction of C_3A with gypsum, forming ettringite first and gypsum exhausted earlier. In the transition of ettringite to low-sulfur calcium sulfoaluminate, calcium aluminate is clearly produced. The finely dispersed CaCO3 also accelerates the hydration of C3S and accelerates with the addition of CaCO3. The hydrated product grows on the surface of the calcium carbonate particles and acts as a nucleus for the hydration of C 3 S and improves the interfacial adhesion.