不同矿物掺料对硫氧镁水泥耐热性能的影响  

Effect of Different Mineral Admixtures on Heat Resistance of Magnesium Oxysulfate Cement

作　　者：崔宝栋 关岩 毕万利[1,2] 滕笑语 梁媛媛[1,2] 陈英 孟宪章 CUI Baodong;GUAN Yan;BI Wanli;TENG Xiaoyu;LIANG Yuanyuan;CHEN Ying;MENG Xianzhang(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Research Institution of Keda Fengchi Magnesium Building Materials,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学材料与冶金学院,鞍山114051 [2]辽宁科技大学科大峰驰镁建材研究院,鞍山114051

出　　处：《硅酸盐通报》2020年第2期428-434,共7页Bulletin of the Chinese Ceramic Society

基　　金：辽宁省镁产业协同创新中心开放课题基金(USTLXT201803);辽宁科技大学研究生科技创新项目(LKDYC201811);辽宁科技大学服务地方经济发展项目(LKDFW201802);辽宁科技大学研究生教育改革与创新项目(2018YJSCX09)。

摘　　要：通过在硫氧镁水泥(MOS)净浆中加入复合外加剂及不同混合材料,分析了不同温度下对MOS热膨胀率、线变化、烧失量以及烧后力学性能的影响。利用X射线衍射仪、扫描电镜及同步热分析仪对试样进行检测,并分析了受热前后试样矿物组成、微观形貌的变化,阐述了受热过程中发生的理化反应等。结果表明,引入复合外加剂、粉煤灰或硅灰均可在一定程度上提高MOS受热后的强度,为硫氧镁水泥在高温领域的应用提供了理论基础。其中引入1.3%复合外加剂的试样500℃烧后强度最高,达到45.3 MPa,较净浆提高了55.8%,引入20%硅灰的试样受热后呈现先收缩后膨胀的现象,500℃烧后强度达到38.5 MPa,较净浆强度提高了35%。实验结果表明,硫氧镁水泥的最高使用温度为800℃。Based on magnesium oxysulfate cement(MOS) net slurry mixed with compound admixture and different materials. And MOS thermal expansion rate, linear change, ignition loss and the influence of mechanical properties after burn were analyzed under different temperatures. X-ray diffractometer, scanning electron microscope and synchronous thermal analyzer were used to test the samples. The changes of mineral composition and micro morphology of the samples before and after heating were analyzed. The physical and chemical reactions during heating were described. The results show that the introduction of composite admixtures, fly ash or silica fume can improve the strength of MOS after heating to a certain extent, which provides a theoretical basis for the application of MOS in high temperature field. The sample with 1.3% composite admixture has the highest strength after fired at 500 ℃, the strength is 45.3 MPa, which is 55.8% higher than that of pure slurry. The sample with 20% silica fume exhibits the phenomenon of shrinkage and expansion after heating. The strength after fired at 500 ℃ reaches 38.5 MPa, which is 35% higher than that of pure slurry. The experimental results show that the maximum service temperature of MOS is 800 ℃.

关 键 词：硫氧镁水泥 耐热性能 矿物掺料 微观形貌 

分 类 号：TQ172[化学工程—水泥工业]