几种缓凝剂对砂浆早期开裂性能的影响  

The Influence of Several Kinds of Retarders on Early Age Cracking Properties of Mortar

作　　者：安雪蕾[1] 蒋洪胜[1] 林荣峰[1] 

机构地区：[1]山东建筑大学,山东济南250101

出　　处：《中国包装科技博览（混凝土技术）》2012年第4期7-9,共3页China Science and Technology Review

摘　　要：掺加缓凝剂使水泥的初凝时间和终凝时间均延长，对水泥水化和凝结时间延缓，使水化反应更完全。醇类化合物加入水泥砂浆形成的水泥基复合材料，其抗裂性得到一定程度的改善，且改善程度与醇类化合物的种类和掺加量有关。聚乙烯醇对水泥基复合材料抗裂性的提高较乙二醇、丙三醇效果要好。醇类化合物加入量增加，有利于水泥基复合材料抗裂性的改善。Retarders allowing the cement setting time and final setting time both extended, on cement hydration and setting time delayed, so that the hydration reaction is more complete. Alcohols into cement mortar formed of a cement-based composite material, its crack resistance is improved to a certain extent, and the improving level is related to alcohol compound types and adding amount. The increasing of Polyvinyl alcohol on crack resistance of cement based composite material is better than ethylene glycol and glycerol.The increasing quantities in which Alcohol compounds added is in favor of cement-based composite materials crack resistance improvement.

关 键 词：砂浆 缓凝剂 砂浆稠度 凝结时间 早期开裂 

分 类 号：TQ172.462[化学工程—水泥工业]