CaF_2对硫铝酸锶钙水泥矿物形成及水化过程的影响

Effect of CaF_2 on Process of Mineral Formation and Hydration of Calcium Strontium Sulphoaluminate Cement

测试了掺CaF2硫铝酸锶钙水泥的抗压强度.通过热分析、X射线衍射分析和扫描电子显微镜观察,研究了CaF2对硫铝酸锶钙水泥熟料矿物形成和水化过程的影响.结果表明,当CaF2掺量为0.2%(质量分数)时,硫铝酸锶钙水泥抗压强度最高,3,28d抗压强度分别达到65.0,86.2MPa.在水泥煅烧过程中,CaF2能加速CaCO3的分解及C1.50Sr2.50A3珔S矿物的形成.此外,CaF2可以加快硫铝酸锶钙水泥的水化速率并促使水化产物CAH10转化为C3AH6.

The compressive strength of calcium strontium sulphoaluminate cement with CaF2 added was tested. The influence of CaF2 on process of mineral formation and hydration of calcium strontium sul-phoaluminate cement were studied by thermal analysis（DTA-TG）, X-ray diffraction（XRD） and scanning electron microscopy（SEM）. The results show that compressive strength of calcium strontium sulphoalumi-nate cement with 0.2 % （ by mass） of CaF2 added is optimal, the compressive strength for 3,28 d is 65.0, 86.2 MPa respectively. CaF2 accelerates decomposition of CaCO3 and formation of C1.50 Sr2.50 A3^-S during sintering of clinker. Due to CaF2, hydration rate of cement is speeded up and CAH10 changes to C3AH6.