减缩剂性能评价方法中的几个问题探讨  

Discussion of Some Questions on Performance Evaluation Method for Shrinkage-reducing Agent

作　　者：林宗浩[1] 王智[1] 蒋长清 金卫民 

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]常州市建筑科学研究院有限公司,常州213015

出　　处：《硅酸盐通报》2013年第8期1693-1697,共5页Bulletin of the Chinese Ceramic Society

基　　金：重庆市科技攻关计划(CSTC;2009AC6024);NSFC(51272295)资助项目

摘　　要：论文在现有研究结果和部分验证试验的基础上,对评价减缩剂性能涉及的试件制作时砂浆的胶砂比与用水量、试件测试初始长度的时间确定与龄期的计算、减缩剂对砂浆(混凝土)早期收缩减少的测定、快速评价减缩剂的性能进行了分析、讨论。建议在减缩剂性能评价时,制备砂浆时灰砂比采用1∶3,用水量根据砂浆流动度达到(180±5)mm决定;试件收缩初始长度以拆模时试件的长度为准,增加从成型开始就采用非接触法测试前3 d的早期收缩;并提出增设减缩剂对降低饱和Ca(OH)2溶液表面张力降低率这一新指标快速判断减缩剂的性能。This paper on the basis of existing research results and part of the verification tests, it have analyzed and discussed the problems on the shrinkage-reducing agent performance evaluation process that cement/sand ratio and water dosage of making cement mortar specimens, time determination of the initial length for the specimen test and calculation of the age, test of shrinkage-reducing agent for early shrinkage of the cement mortar （ concrete）, evaluation the performance of the shrinkage-reducing agent quickly. Finally, the recommendation is that the cement/sand ratio is 1： 3, and water dosage is determined by the fluidity of mortar at （ 180 ± 5 ） mm in pre specimen test from taking apart mold and add on testing early paration of mortar . The shrinkage of shrinkage of first three days with noncontact method, proposing a new norm for judging the performance of the shrinkage-reducing agent quickly that is reduction rate of reducing saturated Ca （OH）2 solution surface tension by shrinkage reducing agent.

关 键 词：减缩剂 减缩率 评价方法 表面张力 

分 类 号：TU52[建筑科学—建筑技术科学]