酰胺基改性聚羧酸减水剂性能研究
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摘要
将丙烯酰胺,甲基烯丙基聚氧乙烯醚,丙烯酸利用水溶液自由基聚合法合成酰胺基改性聚羧酸减水剂,并与未改性聚羧酸减水剂的对比。结果表明:酰胺基的引入降低了聚羧酸减水剂中的羧基密度,因此降低水泥浆体初始流动度;而酰胺基在碱性环境中的水解,可显著改善水泥基材料的经时流动度,同时有效提高水泥基材料的早期和后期强度。
The amide-modified polycarboxylate water-reducing agent was synthesized by free radical polymerization of acrylamide,methylallyl polyoxyethylene ether and acrylic acid with an aqueous solution and compared with an unmodified polycarboxylate water-reducing agent.The results show that the introduction of amide groups reduces the carboxyl group density in the polycarboxylate water reducing agent, thus reducing the initial fluidity of the cement slurry.The hydrolysis of the amide group in the alkaline environment can significantly improve fluidity retention, while effectively improving the early and late strength of cement-based materials.
The amide-modified polycarboxylate water-reducing agent was synthesized by free radical polymerization of acrylamide,methylallyl polyoxyethylene ether and acrylic acid with an aqueous solution and compared with an unmodified polycarboxylate water-reducing agent.The results show that the introduction of amide groups reduces the carboxyl group density in the polycarboxylate water reducing agent, thus reducing the initial fluidity of the cement slurry.The hydrolysis of the amide group in the alkaline environment can significantly improve fluidity retention, while effectively improving the early and late strength of cement-based materials.
引文
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[2]李崇智.新型聚羧酸系减水剂的合成及其性能研究[D].北京:清华大学土木工程系,2004.
[3]SAKAI E,YAMADA K,OHTA A.Molecular structure and dispersion adsorption mechanisms of comb-type superplasticizers used in Japan[J].Advanced Concrete Technology,2003,1(1):16-25.
[4]YAMADA K,TAKAHASHI T,HANEHARA S,et al.Effects of the chemical structure on the properties of polycarboxylate-type superplasticizer[J].Cement and Concrete Research,2000,30(2):197-207.
[5]孔祥明,侯姗姗,史志花.功能单体对聚羧酸减水剂性能的影响[J].建筑材料学报,2014,17(1):1-8.
[6]于飞宇.一种早强型聚羧酸系高性能减水剂的配合比及其制造法[P].CN101205128A.
[7]ZHANG T,SHANG S,YIN F,et al.Adsorptive behavior of surfactants on surface of portland cement[J].Cement and Concrete Rsearch,2001,31(7):1009.
[8]谭洪波.聚羧酸系混凝土减水剂的研究[D].武汉:武汉理工大学,2006.
[9]傅乐峰.聚羧酸超塑化剂的合成、性能和分散吸附行为研究[D].上海:华东理工大学,2010.
[10]PLANK J,SAKAI E,MIAO C W,et al.Chemical admixtureschemistry,application and their impact on concrete microstructure and durability[J].Cement and Concrete Research,2015(78):81-99.
[11]刘治华.不同羧基密度与功能基聚羧酸减水剂的合成及性能研究[D].北京:中国矿业大学,2013.