碱-矿渣水泥缓凝问题的研究进展  

Research Progress on Problem of Retarding of Alkali-activated Slag Cement

作　　者：何娟[1] 杨长辉[1] 康苏芳[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045

出　　处：《硅酸盐通报》2010年第5期1093-1097,共5页Bulletin of the Chinese Ceramic Society

基　　金：国际合作项目(2009DFR50450);重庆大学大学生科研训练计划项目

摘　　要：分析了碱-矿渣水泥的水化凝结特点及快凝的主要影响因素,介绍了碱-矿渣水泥缓凝物质的研究情况。认为缓凝物质的缓凝特点如下:(1)在水化初期,缓凝物质快速与碱矿渣水泥中的离子发生化学反应,形成保护膜,同时降低溶液中Ca2+的浓度,阻止碱组分与矿渣的快速水化生成C-S-H凝胶;(2)引入带电荷的阴阳粒子,在电荷斥力作用下延缓Ca2+的移动速度,或降低硅酸根离子的静电引力,从而阻止C-S-H凝胶的生成,延迟硅酸根离子的聚合,以达到缓凝的效果。The characteristics of hydration and setting of alkali-activated slag cement and the main factors influencing the rapid setting were analysed.The rsearch in retarding materials of alkali-activated slag cement were introduced.The features of retarder was presented as follows：（1） In the beginning of hydration,the retarder rapidly reacts with the ions in alkali-activated slag cement to form protective film and reduce the concentration of calcium ions.Consequently,the formation of C-S-H slows down.（2） Anions and cations are introduced to alkali-activated slag cement,which,under the charge repulsion,can delay the movement speed of Ca2＋ or reduce the electrostatic attraction of [SiO4]4-,thereby preventing the formation of C-S-H gel,delay the polymerization of [SiO4]4-,to achieve the effect of retardation.

关 键 词：碱-矿渣水泥 快凝 缓凝 缓凝物质 

分 类 号：TQ172[化学工程—水泥工业]