STAC在聚羧酸减水剂中对再生混凝土的性能影响
The Influence of STAC in Polycarboxylate-based Water-reducing Agents on the Properties of Recycled Concrete
陈琴 1魏伟 1贾保正 1闫革 1程书凯2
作者信息
- 1. 武汉市汉阳市政建设集团有限公司,武汉 430056
- 2. 武汉工程大学土木工程与建筑学院,武汉 430074
- 折叠
摘要
研究以十八烷基三甲基氯化铵(STAC)为牺牲剂制备抗泥型聚羧酸减水剂(KNPCE),研究了不同合成温度、不同STAC掺量的KNPCE和是否掺有蒙脱土对水泥砂浆的性能影响,并选出最佳配比的减水剂制备再生混凝土,进行工作性能、力学性能和微观结构分析.结果表明,在合成温度80 ℃、牺牲剂掺量0.4％时,KNPCE对砂浆的性能提升效果最好;再生混凝土的坍落度、抗压强度和劈裂抗拉强度随KNPCE掺量的增加而提高;牺牲剂会使PCE晶体的结晶度变高,但是,并不会改变PCE结晶晶型;使用KNPCE的水泥累计放热量会高于使用普通PCE的水泥累计放热量.
Abstract
This study prepared a mud resistant polycarboxylate superplasticizer(KNPCE)using octadecyltrimethylam-monium chloride(STAC)as a sacrificial agent.The effects of different synthesis temperatures,different STAC dosages of KNPCE,and the presence or absence of montmorillonite on the performance of cement mortar were studied.The optimal proportion of superplasticizer was selected to prepare recycled concrete,and the working performance,mechanical proper-ties,and microstructure were analyzed.The results showed that KNPCE had the best performance improvement effect on mortar at a synthesis temperature of 80 ℃ and a sacrificial agent dosage of 0.4％;The slump,compressive strength,and splitting tensile strength of recycled concrete increase with the increase of KNPCE content;Sacrificial agents can increase the crystallinity of PCE crystals,but they do not change the crystal structure of PCE;The cumulative heat release of ce-ment using KNPCE is higher than that of cement using ordinary PCE.
关键词
十八烷基三甲基氯化铵/牺牲剂/抗泥型聚羧酸减水剂/蒙脱土/再生混凝土Key words
STAC/sacrificial agent/KNPCE/montmorillonite/recycled concrete引用本文复制引用
基金项目
湖北省重点研发计划(2020BAB065)
武汉市重点研发项目(2022022202015022)
出版年
2024
NETL
NSTL
万方数据