硫硅酸钙的合成及水化性能的研究

Synthesis and Hydration Properties of Calcium Sulphosilicate

以分析纯物料制备硫硅酸钙(C5S 2$)矿物,通过XRD、f-CaO分析不同煅烧温度对C5S 2$矿物合成的影响,Rietveld精修计算C5S 2$矿物的合成率,SEM观测其形貌。将合成的C5S 2$矿物按不同比例掺入硫铝酸盐水泥中,通过测定抗压强度及水化试样结合水含量来研究C5S 2$矿物对硫铝酸盐水泥力学性能及水化速率的影响。研究表明:C5S 2$矿物的最佳煅烧温度为1150℃,合成率可达到94.9%,C 5S 2$晶体形貌为圆棒状。当C5S 2$掺量在7.5%~10%时,水泥强度明显提高;当C5S 2$掺量为10%时,水泥28 d强度可达到73.3 MPa。掺入适量C5S 2$可以提高硫铝酸盐水泥的水化速率,当C5S 2$掺量为10%时,水泥28 d结合水量达到27.48%,水化速率最高。

Calcium silicate(C5S2$)mineral was prepared from pure materials,and the influence of different calcination systems on the synthesis of C5S2$mineral was investigated by f-CaO determination and XRD analysis.The synthetic C5S2$mineral was mixed into sulfoaluminate cement in different proportions.The influence of C5S2mineral on the mechanical properties and hydration rate of sulfoaluminate cement was studied by measuring the compressive strength and the combined water content of hydrated samples.The results show that:after hydrothermal synthesis of raw materials and calcination at 1150℃,the mineral synthesis rate of C5S2$could reach 94.9%,and the crystal morphology of C5S2$is like a round rod.When the content of C5S2$is 7.5%—10%,the strength of cement test block increases obviously.When the content is 10%,the 28 d strength of cement test block can reach 73.3 MPa.Adding C5S2$can improve the hydration rate of sulphoaluminate cement.When the content is 10%,the combined water amount of 28 d cement reaches 27.48%,with the highest hydration rate.