不同分子量聚羧酸减水剂的结构分析及性能研究
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摘要
本文使用核磁氢谱对PC、 PC30000、 PC50000和PC70000的分子结构进行剖析,并结合水泥净浆流动度结果,揭示了不同相对分子质量范围的PC组分分散性能各异的结构本质。试验表明:随着聚羧酸减水剂相对分子量的提高,聚羧酸减水剂分子结构中的酸醚比逐渐下降;随着聚羧酸减水剂相对分子量的提高,其初始净浆流动度逐渐下降,净浆流动度经时损失变小。因此,得出以下结论:聚羧酸减水剂组分的分子量越高,其分子结构中的酸醚比越低,初始分散性能也越低,保坍性能越高。
The molecular structure of PC( Polycarboxylate), PC30000, PC50000 and PC70000 is analyzed by nuclear magnetic resonance spectroscopy. Combined with the results of cement paste fluidity, the structure natureis revealednamely the dispersion performance of PC components with different relative molecular mass range is different.The experiment shows that the acid-ether ratio in the molecular structure of the polycarboxylate water reducers decreases with the increase of the relative molecular weight of polycarboxylate water reducers. With the increase of the relative molecular weight of polycarboxylate water reducers, the initial slurry fluidity gradually decreases, and the slurry fluidity losses with time.Therefore, it is concluded that the higher the molecular weight of the polycarboxylic water reducers, the lower the acid-ether ratio in the molecular structure, the lower the initial dispersion property, while the higher the slump loss resistant property.
The molecular structure of PC( Polycarboxylate), PC30000, PC50000 and PC70000 is analyzed by nuclear magnetic resonance spectroscopy. Combined with the results of cement paste fluidity, the structure natureis revealednamely the dispersion performance of PC components with different relative molecular mass range is different.The experiment shows that the acid-ether ratio in the molecular structure of the polycarboxylate water reducers decreases with the increase of the relative molecular weight of polycarboxylate water reducers. With the increase of the relative molecular weight of polycarboxylate water reducers, the initial slurry fluidity gradually decreases, and the slurry fluidity losses with time.Therefore, it is concluded that the higher the molecular weight of the polycarboxylic water reducers, the lower the acid-ether ratio in the molecular structure, the lower the initial dispersion property, while the higher the slump loss resistant property.
引文
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[10]何燕,孔亚宁,王啸夫,等.不同羧基密度聚羧酸减水剂对水泥浆体性能的影响[J].建筑材料学报,2018,21(02):185-188.
[11]游长江,丁超,胡国栋,等.聚羧酸类高效减水剂的研究进展[J].高分子材料科学与工程,2003(02):34-38.
[2]王玲,高瑞军.聚羧酸系减水剂的发展历程及研发方向[J].混凝土世界,2012(11):54-57.
[3]缪昌文,冉千平,洪锦祥.聚羧酸系高性能减水剂的研究现状及发展趋势[J].中国材料进展, 2009(11):36-53.
[4]莫祥银,景颖杰,邓敏,等.聚羧酸盐系高性能减水剂研究进展及评述[J].混凝土,2009(03):60-63.
[5]孙申美.浅析聚羧酸系减水剂与粘土的吸附机理[J].广州建筑,2016,44(01):33-35.
[6]马保国,杨虎,谭洪波,等.聚羧酸减水剂在水泥和泥土表面的吸附行为[J].武汉理工大学学报, 2012,34(05):1-5.
[7]王国建,魏敬亮.混凝土高效减水剂及其作用机理研究进展[J].建筑材料学,2004(02):188-193.
[8] UCHIKAWAH, HANEHARAS,SAWAKI D.The role of steric repulsive force in the dispersion of cement particles in fresh paste prepared with organic admixture[J]. Cement Concrete Research, 1997, 27(1):35-50.
[9]徐忠洲.基于分子量分级的聚羧酸系高性能减水剂的复配技术研究[D].石家庄铁道大学,2014.
[10]何燕,孔亚宁,王啸夫,等.不同羧基密度聚羧酸减水剂对水泥浆体性能的影响[J].建筑材料学报,2018,21(02):185-188.
[11]游长江,丁超,胡国栋,等.聚羧酸类高效减水剂的研究进展[J].高分子材料科学与工程,2003(02):34-38.