高保坍型聚羧酸减水剂的合成及其对混凝土性能的影响分析  

Preparation of high slump-preserving polycarboxylate water reducer andanalysis of its influence on concrete properties

作　　者：史绘洲 王辉 SHI Huizhou;WANG Hui(Taian Taishan District Urban Construction Guidance Service Center,Taian 271000,China;School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 271001,China)

机构地区：[1]泰安市泰山区城市建设指导服务中心,山东泰安2710002.山东科技大学土木工程与建筑学院,山东青岛271001

出　　处：《功能材料》2022年第8期8196-8201,共6页Journal of Functional Materials

基　　金：国家自然科学基金项目(81360254);山东省自然科学基金项目(ZR2020ME097)。

摘　　要：以甲基烯丙基聚乙二醇醚(TPEG-2400)、丙烯酸(AA)等为单体,过硫酸铵(APS)为引发剂,甲基丙烯磺酸钠(MAS)为链转移剂,在水溶液中进行了自由基共聚反应合成了高保坍型聚羧酸减水剂,探究了最佳合成工艺及其对混凝土应用性能的影响。结果表明,水泥净浆初始和1 h的流动度随着酸醚比、链转移剂MAS用量、引发剂APS用量、温度和滴加时间的增加,均表现出先增大后减小的趋势。当n(AA)∶n(TPEG)=4∶1,MAS用量为AA和TPEG总质量的3%,引发剂APS用量为AA和TPEG总质量的3%,反应温度为60℃,滴加时间为1.5 h时,水泥净浆初始和1 h的流动度达到了最大值,合成的高保坍型聚羧酸减水剂性能最优。在此条件下合成的聚羧酸减水剂与市售TPEG型减水剂和HPEG型减水剂相比,具有更优的分散性、保坍性能和抗压强度。High slump retaining polycarboxylic acid water reducer was synthesized by free radical copolymerization in aqueous solution with methyl allyl polyethylene glycol ether(TPEG-2400)and acrylic acid(AA)as monomers,ammonium persulfate(APS)as initiator and sodium methacrylate sulfonate(MAS)as chain transfer agent,and the optimum synthesis process and its influence on the application performance of concrete were explored.The results showed that the initial and 1 h fluidity of cement paste increased first and then decreased with the increase of acid ether ratio,the amount of chain transfer agent MAS,the amount of initiator APS,temperature and dropping time.When n(AA)∶n(TPEG)=4∶1,the amount of MAS was 3%of the total mass of AA and TPEG,the amount of initiator APS was 3%of the total mass of AA and TPEG,the reaction temperature was 60℃,the dropping time was 1.5 h,the initial and 1 h fluidity of cement paste reached the maximum,and the synthesized high slump retaining polycarboxylic acid water reducer had the best performance.The polycarboxylic acid water reducer synthesized under this condition had better dispersibility,slump resistance and compressive strength than TPEG water reducer and HPEG water reducer.

关 键 词：聚羧酸减水剂 合成工艺 混凝土 分散性 保坍性能 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]