MgO对C_2S矿物形成的影响  

Influence of MgO on Formation of C_2S

作　　者：李好新[1] 王培铭[1] 熊少波[1] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《建筑材料学报》2006年第2期136-141,共6页Journal of Building Materials

基　　金：国家重点基础研究发展规划(973)资助项目(2001CB610704)

摘　　要：通过化学分析和差热分析试验手段,分别测定了试样中f-CaO的含量(质量分数,下同)和试样在烧成过程中的热变化曲线,并以试样中f-CaO的含量作为反应进度的量度,研究了MgO对高C3S水泥熟料矿物———C2S的影响.化学分析和差热分析试验结果显示,MgO的加入降低了试样中f-CaO的含量,降低了CaCO3的分解峰温和C2S矿物形成的初始温度.热力学函数计算分析显示,MgO的加入增大了n(CaO)/n(SiO2)比值,从而增大了矿物形成的反应自由能数值.By testing the content of free CaO in the sample, the content of free-CaO in the sample was regarded as the measurement of reacting. The influence of MgO on the formation of mineral of C2S which is the component of high-C3S cement was studied by the research methods of chemical analysis and thermal analysis. It is found that appropriate adding of MgO helps absorption of free-CaO, and benefited the formation of mineral of C2S; furthermore, lowers decomposition temperature of CaCOs. At last, regarding the thermodynamic reason of this phenomenon, it is found that adding MgO increases the ratio of n （CaO）/n （SiO2）, enhances the thermodynamic function of C2S mineral formation.

关 键 词：化学分析 差热分析 热力学 

分 类 号：TU528.0[建筑科学—建筑技术科学]