缓凝剂对C_3A石膏体系水化历程的影响  

The influence of retarders on the hydration process of C_3 A-gypsum system

作　　者：马保国[1] 肖君[1] 夏永芳[1] 胡家兵[1] 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070

出　　处：《功能材料》2013年第10期1476-1479,1483,共5页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB623201)

摘　　要：利用多种缓凝剂对C3A-石膏体系水化历程进行调控,研究缓凝剂对其水化历程的影响,采用了水化热、XRD和拉曼光谱等测试手段分别表征了水化放热规律及水化历程变化规律。结果表明,三聚磷酸钠对于C3A-石膏体系水化历程的延缓作用最强,而硼酸则能更好地抑制水化放热总量。三聚磷酸钠可抑制石膏的溶出速率,延缓早期水化反应,且难溶性磷酸钙盐的吸附及包裹作用会抑制C3A的溶解水化作用;而葡萄糖酸钠的静电吸附、不溶性钙盐包裹作用以及硼酸的沉淀作用会隔离C3A颗粒与水接触,阻碍了C3A的水化反应。Using a variety of retarders to regulate the hydration process of UsA-UaSO4.2H2O system, and research their mechanism. We use hydration heat, XRD and Raman spectroscopy testing the hydration heat rules and hydration process law. The results show that： sodium tripolyphosphate has the strongest delaying effect, while boric acid is better able to inhibit the hydration heat emission amount for the hydration process of C3A- gypsum system. Sodium tripolyphosphate can inhibit the gypsum dissolving rate, delay the early hydration reaction, and infusibility calcium phosphate salt will adsorb and cover on the surface of C3A and gypsum, while inhibiting its dissolution and hydration; sodium gluconate can hinder the hydration of C3 A through electrostatic adsorption and infusibility calcium salt＇s package action, and boric acid can precipitate in surface of C3A through forming a insoluble calcium borate complexes parcel layer.

关 键 词：C3A 缓凝剂 水化历程 水化放热 水化产物 

分 类 号：TU528[建筑科学—建筑技术科学]