同济大学学报（自然科学版）2017，Vol.45Issue(2)：244-248,5.DOI:10.11908/j.issn.0253-374x.2017.02.013
含不同官能团聚羧酸减水剂的吸附-分散性能
Adsorption and Dispersing Capability of Polycarboxylate Superplasticizers with Various Functional Groups
摘要
Abstract
A series of polycarboxylate superplasticizers (PCEs) with different functional groups were synthesized through free radical polymerization.The adsorption behavior as well as dispersing capability of these PCEs was investigated.In addition,the effects of these PCEs on cement hydration process were systematically studied through isothermal calarimetry and X-ray diffraction (XRD).The results show that PCE with acylamino groups most significantly depresses the dispersing capability due to highly decreased adsorption amount on cement particles,while PCEs with ester function groups rarely influence the dispersing capability.PCEs with sulfonic groups exhibit enhanced adsorption behavior.The introduction of ester groups or AMPS into PCE backbones remarkably hinders the induction period of cement paste,in comparison with reference PCE (P(PEG1-AA4)) (the molar ratio of side chains to negative ions is 1:4),while the introduction of sulfonic groups into PCE molecules improves the maximum hydration heat evolution rate at acceleration period.At early ages,PCEs inplanted with sufonic groups,acylamino groups,or ester groups promotes the hydration process in comparison with reference PCEs (P(PEG1-AA4)).However,at 28 days,cement paste added with reference PCE (P (PEG1-AA4)) exceeds that with other PCEs in cement hydration degree.关键词
聚羧酸减水剂/官能团/吸附量/分散性能/水化性能Key words
polycarboxylate superplasticizer/functional groups/adsorption amount/dispersing capability/cement hydration process分类
建筑与水利引用本文复制引用
何燕,张雄,张永娟,王义廷..含不同官能团聚羧酸减水剂的吸附-分散性能[J].同济大学学报（自然科学版）,2017,45(2):244-248,5.基金项目
国家自然科学基金(No:51378391) （No:51378391）
“十三五”国家重点研发计划(2016YFC0700800) （2016YFC0700800）
