A new kind of polycarboxylate superplasticizer with high slump loss resistance was obtained by designing scheduled molecular structure.The number average molecular mass of the polymer was characterized by the gel perm...A new kind of polycarboxylate superplasticizer with high slump loss resistance was obtained by designing scheduled molecular structure.The number average molecular mass of the polymer was characterized by the gel permeation chromatography measurements.And chemical structure of the polymer was observed by the Fourier transform infrared spectroscopy(FT-IR).The results show that the good workable maintaining of self-compacting concrete could be achieved through direct adjustment of number average molecular mass and different unsaturated monomer in synthetic process.The FT-IR analysis illustrated that the high slump loss resistance of polycarboxylate superplasticizers with ester and carboxyl group and expectations of molecular structure were designed.展开更多
应用高分子设计原理,合成了一种低坍损梳形聚羧酸系高效减水剂。考察了引发剂用量、单体摩尔比及反应时间对其分散性能的影响。结果表明,在甲基丙烯酸/甲基烯丙基磺酸钠/聚氧化乙烯丙烯酸酯摩尔比56:12:32,引发剂过硫酸铵用量占单体总量...应用高分子设计原理,合成了一种低坍损梳形聚羧酸系高效减水剂。考察了引发剂用量、单体摩尔比及反应时间对其分散性能的影响。结果表明,在甲基丙烯酸/甲基烯丙基磺酸钠/聚氧化乙烯丙烯酸酯摩尔比56:12:32,引发剂过硫酸铵用量占单体总量2.5%,反应温度80℃,反应时间6 h 条件下,合成的聚羧酸系减水剂水泥净浆流动度可达238mm。用此减水剂配制的混凝土,在减水剂用量0.2%时,减水率达22.5%,混凝土的坍落度60 min 内几乎无损失。展开更多
文摘A new kind of polycarboxylate superplasticizer with high slump loss resistance was obtained by designing scheduled molecular structure.The number average molecular mass of the polymer was characterized by the gel permeation chromatography measurements.And chemical structure of the polymer was observed by the Fourier transform infrared spectroscopy(FT-IR).The results show that the good workable maintaining of self-compacting concrete could be achieved through direct adjustment of number average molecular mass and different unsaturated monomer in synthetic process.The FT-IR analysis illustrated that the high slump loss resistance of polycarboxylate superplasticizers with ester and carboxyl group and expectations of molecular structure were designed.
文摘应用高分子设计原理,合成了一种低坍损梳形聚羧酸系高效减水剂。考察了引发剂用量、单体摩尔比及反应时间对其分散性能的影响。结果表明,在甲基丙烯酸/甲基烯丙基磺酸钠/聚氧化乙烯丙烯酸酯摩尔比56:12:32,引发剂过硫酸铵用量占单体总量2.5%,反应温度80℃,反应时间6 h 条件下,合成的聚羧酸系减水剂水泥净浆流动度可达238mm。用此减水剂配制的混凝土,在减水剂用量0.2%时,减水率达22.5%,混凝土的坍落度60 min 内几乎无损失。
