摘要
针对砂石含泥量高会对掺聚羧酸减水剂混凝土产生的负面影响,选用马来酸酐(MA)和磷酸盐(PPs)为单体,过硫酸铵(APS)为引发剂,合成了一种能够抑制混凝土细集料中泥土副作用的抗泥剂KN-P,最佳合成条件为:n(MA)∶n(PPs)=2.5∶1,催化剂、APS用量分别为MA质量的0.08%、8%,70℃滴加3.5 h,在80℃保温2 h。FTIR分析表明,合成的产物为含磷聚羧酸共聚物;净浆流动度试验表明,在减水剂折固掺量仅为0.10%,该抗泥剂掺量为0.08%时,掺10%泥土的水泥浆体初始和1 h流动度分别为292、295mm,混凝土1 h坍落度、扩展度分别为190、420 mm。表明该抗泥剂具有抑制高含泥量的细集料负面影响的作用。
In view of the negative impact of high clay content of sand on concrete doped with polycarboxylic acid superplasti-cizer,a new clay resistant agent KN-P was synthesized using maleic anhydride(MA) and phosphate(PPs) as monomers and ammonium persulfate(APS) as initiator,which can inhibit the side effects of soil in fine aggregates of concrete.The best conditions of synthesizing:n(MA)∶n(PPs)=2.5∶1,the dosage of catalyst and APS were 0.08% and 8% of MA mass respectively,the APS drip time was 3.5 h at 70 ℃,and the temperature was kept at 80 ℃ for 2 h.The result of FTIR analysis showed that the synthesized product was phosphorous polycarboxylic acid copolymer.The cement paste fluidity test shows that the initial and 1 h cement paste fluidity was 292 mm and 295 mm respectively,when the cement adding 10% soil,the content of polycarboxylic acid superplasticizer was only0.10% and the content of KN-P was 0.08%,and the slump,expansion of concrete was 190 mm and 420 mm respectively after 1 h.The results showed that KN-P could inhibit the negative effects of fine aggregates with high clay content.
作者
赵军丽
龙一飞
潘婵
李杨薇
刘木林
ZHAO Junli;LONG Yifei;PAN Chan;LI Yangwei;LIU Mulin(Wuhan City University,Wuhan 430083,China;China University of Geosciences,Wuhan 430074,China)
出处
《新型建筑材料》
2024年第2期149-153,共5页
New Building Materials
关键词
抗泥剂
磷化型
抗泥作用
保坍性能
clay resistance agent
phosphating type
clay resistance
slump retention property
作者简介
赵军丽,女,1973年生,硕士,讲师,主要从事混凝土外加剂的研究,E-mail:457323849@qq.com。
