不同掺量非晶态C_(12)A_7/CaSO_4·2H_2O体系对OPC早期性能的影响及作用机理  

Effects of Different Content of Amorphous C_(12)A_7/CaSO_4·2H_2O System on Early Properties of OPC and Mechanical Performance

作　　者：张江涛[1] 王栋民[1] 王奕仁 李文平[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院混凝土与环境材料研究所,北京100083

出　　处：《硅酸盐通报》2017年第1期1-7,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51572293)

摘　　要：研究了不同掺量非晶态C_(12)A_7/CaSO_4·2H_2O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C_(12)A_7/CaSO_4·2H_2O体系掺量为5%,非晶态C_(12)A_7与CaSO_4·2H_2O的质量比为1.0∶1.0时,非晶态C_(12)A_7/CaSO_4·2H_2O体系能够促进C_3S和C_2S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 C12A7/CaSO4·2H2O 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 C12A7/ CaSO4·2H2O system used5% of unit weight of cement,the mass ratio of C12A7 and CaSO4·2H2O was 1.0 to 1.0,the system accelerated the hydration of C3S and C2S,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.

关 键 词：非晶态C12A7 钙矾石 早期抗压强度 水化 

分 类 号：X781[环境科学与工程—环境工程]