【摘要】 利用X射线衍射、扫描电子显微镜、能谱和岩相分析研究了MgO对阿利特–硫铝酸锶钙水泥矿物组成、结构和性能的影响。结果表明:当MgO含量为1%～5%时,阿利特–硫铝酸锶钙水泥早期强度明显提高;MgO在水泥中的最佳含量为2%,在最佳掺量条件下,其3 d和28 d强度分别为64.3 MPa和103.6 MPa;适量的MgO能够促进硫铝酸锶钙矿物(0.5CaO.2.5SrO.3Al2O3.CaSO4,C1.5Sr2.5A3 S)的形成,但当MgO含量过高时,对C1.5Sr2.5A3 S的形成产生阻碍作用;MgO能促进阿利特矿物的形成,有利于水泥力学性能的提高;与硅酸盐水泥相比较,阿利特–硫铝酸锶钙水泥中能够固溶较多的MgO,使高镁原料的利用成为可能。更多还原

【Abstract】 The influence of MgO on composition,structure and properties of alite–calcium strontium sulphoaluminate cement were researched by means of X-ray diffraction,scanning electron microscope–energy dispersive spectroscopy(SEM–EDS) and lithofacies analysis.The results show that when the mass fraction of MgO is 1%–5%,the early strength of cement is enhanced significantly.The optimal content of MgO in the cement clinker is 2% and the compressive strength of the cement at 3,28 d are 64.3,103.6 MPa respec-tively.A suitable amount of MgO can promote the formation of C1.5Sr2.5A3,while the formation of C1.5Sr2.5A3 can be hindered when the content of MgO is excessive.The existence of MgO can improve the formation of C3S,increasing the mechanical property of the cement.Compared with the portland cement,alite–calcium strontium sulphoaluminate cement has a higher capacity to MgO,which indicates that low-quality high-magnesium limestone can be used in the cement production.更多还原