CaF_2对阿利特-硫铝酸锶钙水泥性能的影响

Effect of CaF_2 on the Performance of Alite-strontium Calcium Sulfoaluminate Cement

将硫铝酸锶钙矿物引入到硅酸盐熟料矿物体系中,合成阿利特-硫铝酸锶钙水泥。利用XRD,SEM-EDS和岩相等测试手段研究了CaF2对阿利特-硫铝酸锶钙水泥熟料矿物组成和水泥性能的影响。结果表明,CaF2能够促进固相反应使得阿利特在较低温度下形成,有利于阿利特和硫铝酸锶钙矿物的共存。当CaF2在熟料中的掺入量为0.6%时,阿利特-硫铝酸锶钙水泥的1 d、3 d和28 d抗压强度分别达到32.8 MPa、67.7 MPa和120.4 MPa,表现出良好的力学性能。

Alite-strontium calcium sulphoaluminate cement,a new type of cementitious material is synthesized by combining strontium calcium sulphoaluminate with minerals of Portland cement.The influence of CaF2 on the synthesis and performance of the cement is studied by XRD,SEM-EDS,and lithofacies.The results show that suitable amount of CaF2 can benefit f-CaO combination and promote the formation of alite and strontium calcium sulphoaluminate at low temperature.The optimal mass fraction of CaF2 is 0.6%.The compressive strength of the cement prepared under these conditions reaches to 32.8 MPa,67.7 MPa and 120.4 MPa at 1 d,3 d and 28 d.