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研究了5%掺量下,不同质量比的非晶态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。结果表明: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;当非晶态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,水泥早期强度最高,7 d抗压强度达到100 MPa,说明此体系反应比较完全。
The effects of the amorphous C 12 A 7 / CaSO 4 · 2H 2 O with different mass ratios on the setting time, fluidity and early compressive strength of OPC were studied. The effects of hydration products The phase and morphology were characterized. The results show that the amorphous C 12 A 7 / CaSO 4 · 2H 2 O system can promote the hydration of C 3 S and C 2 S, and the CSH gels interweave and overlap with each other to form the network structure to promote the condensation. At the same time, Crystalline ettringite and ettringite were intercalated with the preformed CSH gel to make the structure of hydration products compact and improve the early strength. When the content of Amorphous C 12 A 7 / CaSO 4 · 2H 2 O was 5% When the mass ratio of C_ (12) A_7 to CaSO_4 · 2H_2O is 1.0:1.0, the early strength of cement is the highest and the compressive strength reaches 100 MPa at 7 d, indicating that the reaction of this system is complete.