研究了不同掺量非晶态C12 A7/CaSO4·2H2 O体系对OPC净浆凝结时间、流动性和早期抗压强度的影响，通过XRD和SEM对水化产物的物相和形貌进行了表征，并采用量热试验对其水化历程进行了分析。结果表明：非晶态C12 A7/CaSO4·2H2 O体系掺量为5%，非晶态C12 A7与CaSO4·2H2 O的质量比为1.0∶1.0时，非晶态C12 A7/CaSO4·2H2 O体系能够促进C3 S和C2 S的水化，生成C-S-H凝胶相互交织搭接形成网络结构而促进凝结；同时也促使OPC水化早期产生大量针状晶体钙矾石，钙矾石与前期生成的C-S-H凝胶相互填充，使水化产物结构密实，提高早期强度。
The effect of different content of amorphous C12 A7/CaSO4 · 2H2 O system on the early properties of setting time, fluidity and compressive strength of OPC was to investigate. Hydration products were tested by X-ray diffraction ( XRD ) and Scanning electron microscope ( SEM ) , and hydration process was analyzed by calorimetric method. The results show that C12 A7/CaSO4 ·2H2 O system used 5% of unit weight of cement, the mass ratio of C12 A7 and CaSO4 ·2H2 O was 1. 0 to 1. 0, the system accelerated the hydration of C3 S and C2 S, the hydration product C-S-H gel intertwined overlap to form the network structure which resulted the quick setting of cement paste, it also formed a large amount of acicular ettringite, the structure of hydration products was more and more compact, because of the ettringite filled with C-S-H gel each other, it improved the early strength of cement paste.
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