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.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
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)
