Novel concrete superplasticizers based on phosphate esters
Novel concrete superplasticizers based on phosphate esters
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DOI：
10.1016/j.cemconres.2019.01.006
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发表时间：
2019-05-01
影响因子：
11.4
通讯作者：
Plank, J.
中科院分区：
文献类型：
--
作者：
Stecher, J.;Plank, J.
以不同摩尔比的聚乙二醇甲基丙烯酸酯与2-(甲基丙烯酰氧基)乙基磷酸酯进行共聚反应，合成了新型聚磷酸盐高效减水剂，用尺寸排斥层析和元素分析对合成的磷酸盐梳状聚合物进行了表征，并通过水泥浆体的小型坍落度试验评价了其在水泥中的分散性能。与传统的聚羧酸盐梳状聚合物(PCE)相比，磷酸盐梳状聚合物具有更好的分散性能，对水泥的缓凝作用更小，对硫酸盐和粘土杂质的耐久性相当。这些性质可以用磷酸基团的高钙络合能力来解释。因此，磷化梳状聚合物为聚羧酸盐高效减水剂提供了一种可行的替代方案。
Novel polyphosphate superplasticizers were synthesized by copolymerization reaction between 2-(methacryloyl oxy) ethyl phosphate monomer and the macromonomer polyethylene glycol methacrylate ester at different molar ratios.The synthesized phosphated comb polymers were characterized by size exclusion chromatography and elemental analysis and their dispersing performance in cement was assessed via mini slump tests in cement paste.The phosphated comb polymers exhibited superior dispersing performance over conventional poly-carboxylate comb polymers (PCEs), were less retarding on cement and showed comparable robustness against sulfate and clay impurities. These properties can be explained by the high calcium complexing capacity of the phosphate groups. Thus, phosphated comb polymers present a viable alternative to poly-carboxylate super plasticizers.