非离子聚丙烯酰胺絮凝剂对减水剂分散性能的影响  

Effect of Nonionic Polyacrylamide Flocculant on Dispersibility of Water Reducer

作　　者：檀军锋 杨雷 Serina NG 李想东 宋欣 罗鑫 陈福现 TAN Junfeng;YANG Lei;SERINA NG;LI Xiangdong;SONG Xin;LUO Xin;CHEN Fuxian(China Railway Jingcheng Engineering Testing Co.Ltd.,Beijing 104442,China;Shijiazhuang Chang′an Yucai Building Materials Co.Ltd.,Shijiazhuang Hebei 051430,China;Sichuan Tongdao Technology Co.Ltd.,Chengdu Sichuan 610200,China;China Railway 22nd Bureau Group Co.Ltd.,Beijing 100043,China)

机构地区：[1]中铁京诚工程检测有限公司,北京104442 [2]石家庄市长安育才建材有限公司,河北石家庄051430 [3]四川砼道科技有限公司,四川成都610200 [4]中铁二十二局集团有限公司,北京100043

出　　处：《铁道建筑技术》2024年第8期1-4,共4页Railway Construction Technology

基　　金：中铁二十二局集团有限公司科技研发计划项目(19-04A)。

摘　　要：本文选用非离子聚丙烯酰胺絮凝剂和不同侧链长度、酸醚比的聚羧酸减水剂、萘系减水剂,通过试验研究聚丙烯酰胺与减水剂之间的相互作用及对减水剂分散性能的影响。研究结果:随聚丙烯酰胺含量增加,减水剂的初始分散性能和保持性能均随之下降,而萘系减水剂所受影响较小;随聚羧酸侧链长度增加,聚羧酸减水剂的初始分散性能和保持性能下降严重;随聚羧酸酸醚比增加,各种聚羧酸减水剂的初始分散性能和保持性能受聚丙烯酰胺的影响差距不大;聚羧酸减水剂先吸附于水泥颗粒上,侧链再与聚丙烯酰胺通过氢键相互作用、缠结,从而降低了减水剂的空间位阻效应,随水泥水化更易被水化产物覆盖。Nonionic polyacrylamide flocculant,polycarboxylic acid superplasticizer and naphthalene series superplasticizer with different side chain length and ratio of acid to ether were selected to study the interaction between polyacrylamide and superplasticizer and the influence on the dispersion of superplasticizer.The results were found:with the increase of polyacrylamide content,the initial dispersion and retention properties of water reducing agent decreased,but naphthalene series water reducing agent was least affected.With the increase of side chain length of polycarboxylic acid,the initial dispersion and retention properties of polycarboxylic acid superplasticizer decreased more seriously.With the increase of acid-ether ratio of polycarboxylic acid,the initial dispersion and retention properties of polycarboxylic acid superplasticizers were not significantly affected by polyacrylamide.Polycarboxylic acid superplasticizer was first adsorbed on cement particles,and then side chain interacted with polyacrylamide through hydrogen bond and entanglement,thus reducing the steric hindrance effect of the superplasticizer.With the hydration of cement,it was easier to be covered by hydration products.

关 键 词：非离子聚丙烯酰胺 絮凝剂 减水剂 侧链长度 酸醚比 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]