水化硅酸镁胶凝材料研究进展  

Research Development of Magnesium Silicate Hydrate Cement

作　　者：宋强[1] 胡亚茹[1] 王倩 张军 陈延信[1] SONG Qiang;HU Yaru;WANG Qian;ZHANG Jun;CHEN Yanxin(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院

出　　处：《硅酸盐学报》2019年第11期1642-1651,共10页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2017YFB0309903-03,2016YFB0303400);陕西省重点研发计划(2017GY-142,2017GY-176);陕西省自然科学基金(2017JM5097)

摘　　要：可溶性SiO2与MgO反应可形成水化硅酸镁凝胶[(MgO)x–SiO2–(H2O)y,M-S-H]。M-S-H凝胶的组成可变,结晶度差,硅氧四面体呈层状结构,对体系抗压强度起主要作用。M-S-H凝胶形成速率依赖于反应物的活性,活性MgO和硅灰是常见的反应物,该混合物遇水放热,放热速率与MgO活性密切相关,浆体溶液呈弱碱性,被认为在建筑材料领域有潜在应用价值。系统总结了M-S-H反应机理、组成特点、孔溶液化学、水化热、工作性和强度演化规律及其影响因素,同时分析了Mg^2+对C-S-H和Ca^2+对M-S-H的作用机理,展望了水化硅酸镁胶凝材料发展前景。The reaction of MgO and soluble silica form magnesium silicate hydrate gel((MgO)x–SiO2–(H2 O)y, M-S-H). With different chemical compositions, poorly crystalline phases and sheet structures of silicon-oxy tetrahedron, and M-S-H is responsible for the compressive strength development. The formation rate of M-S-H depends on the activity of reactants, reactive MgO and silica fume are the common reactants. The reaction of mixture of MgO and silica fume with water is exothermic, and the hydration heat emission rate and quantity are associated with MgO reactivity. The weak alkalinity of solution of pastes shows a promising in potential applications as building materials. This review presented the reaction mechanisms, composition, pore solution chemistry, heat evolution, strength and workability, and analyzed the factors affecting the properties mentioned above. The effect of Mg^2+ on C-S-H and Ca^2+ on M-S-H calcium was summarized. In addition, the development of magnesium silicate hydrate cement in the future was also discussed.

关 键 词：水化硅酸镁 反应机理 氧化镁 硅灰 

分 类 号：TQ172[化学工程—水泥工业]