聚羧酸系减水剂的分散作用及其引气性能(英文) 被引量：33

DISPERSIBILITY AND AIR ENTRAINING PERFORMANCE OF POLYCARBOXYLATE-TYPE WATER REDUCERS

导出

摘要采用自由基聚合法合成了一系列聚羧酸减水剂,通过正交试验研究了减水剂官能团种类及比例,引发剂、链转移剂对其在水泥浆中分散性能的影响。在此基础上,通过优化官能团比例及调整分子量合成了一种引气性低且分散性高的聚羧酸系减水剂。分析了官能团比例和分子量对聚羧酸系减水剂引气性能的影响,探讨了分子量及其分布与聚羧酸系减水剂的分散性能及其饱和掺量的关系。结果表明:合适的官能团比例是降低聚羧酸系减水剂引气性的前提。官能团比例合适时,分子量过高将导致其引气性增强,聚羧酸系减水剂在水泥净浆中的分散性低,且在水泥砂浆中的饱和掺量高。 A series of polycarboxylate-type water reducers （PCWRs） were synthesized by free radical copolymerization. Effects of type and ratio of the functional group, initiator and chain transfer on the dispersibility of the PCWRs in cement grout were investigated by using an orthogonal test. The PCWR with a low air entraining capability and a high dispersibility was synthesized by optimizing the functional group ratio and adjusting the molecular mass. The effects of the functional group ratio and the molecular mass on the air entraining performance of the PCWR were analyzed. The relationships among the molecular mass and its distribution and the dispersibility, as well as the saturation dosage of the PCWRs were discussed. The results show that. The strengthened air entraining capability of the PCWR with the appropriate functional group ratio results from the excessively high molecular mass. When the molecular mass is excessively high, the dispersibility of the PCWR in the cement paste is low, but its saturation dosage in cement mortar is high.

作者李顺文梓芸

机构地区华南理工大学材料科学与工程学院

出处《硅酸盐学报》 EI CAS CSCD 北大核心 2009年第4期616-621,共6页 Journal of The Chinese Ceramic Society

关键词聚羧酸系减水剂分子量分布分散性能引气性能 polycarboxylate-type water reducers molecular mass distribution dispersibility air entraining performance

分类号 TQ172 [化学工程—水泥工业]

引文网络
相关文献

参考文献1

1李顺,文梓芸,王恒昌.聚羧酸系超塑化剂合成及其对水泥基材料性能的影响(英文)[J].硅酸盐学报,2008,36(7):884-889. 被引量：25

二级参考文献12

1KINOSHITA M, YONEZAWA T, YUKI Y. Chemical structure and performance of a new type high range water reducing agent for ultra high strength concrete [J]. Semento, Konkurito Ronbunshu, 1993, 47: 196-201.
2LIM G G, HONG S S, KIM D S, et al. Slump loss control of cement paste by adding polycarboxylic type slump-releasing dispersant [J]. Cem Concr Res, 1999, 29(2): 223-229.
3LIAO T S, HWANG C L, YE Y S, et al. Effects of a carboxylic acid/sulfonic acid copolymer on the material properties of cementitious materials [J]. Cem Concr Res, 2006, 36(4): 650-655.
4YAMADA K, TAKAHASHI T, MATSUHISA M. Effect of chemical structure and water cement ratio on the fluidity of cement paste added with polycarboxylate type dispersant [J]. Semento, Konkurito Ronbunshu, 1998, 52: 158-164.
5OHTA A, SUGIYAMA T, TAMAKA Y. Fludizing mechanism and application of polycarboxylate based superplasticlzers [A]//MALHOTRA V Med. 5th CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete [C], Rome, Italy, 1997: 359-378.
6YAMADA K, OGAWA S, HANEHARA S. Controlling of the adsorption and dispersing force of polycarboxylate-type superplasticizer by sulfate ion concentration in aqueous phase [J]. Cem Concr Res, 2001, 31(3): 375-383.
7TSENG Y C, WU W L, HUANG H L. New carboxylic acid-based superplasticizer for high-performance concrete [A]//6th CANMET/ ACI International Conference on Superplaticizers and Other Chemical Admixtures in Concrete [C], Nice, France, 2000: 401-413.
8YOSHIOKA K, SAKAI E, DAIMON M, et al. Role of steric hindrance in the performance of water-reducers for concrete [J]. J Am Ceram Soc, 1997, 80(10): 2 667-2 672.
9YOSHIOKA K, TAZAWA E, KAWAI K, et al. Adsorption characteristics of superplasticizers on cement component minerals [J]. Cem Concr Res, 2002, 32(10): 1 507-1 513.
10YAMADA K, TAKAHASHI T, HANEHARA S, et al. Effects of the chemical structure on the properties of polycarboxylate-type superplasticizer [J]. Cem Concr Res, 2000, 30(2): 197-207.