化工学报2017，Vol.68Issue(5)：2204-2210,7.DOI:10.11949/j.issn.0438-1157.20161275
β-环糊精侧链对聚羧酸减水剂抑制蒙脱土的影响
Effect ofβ-cyclodextrin pendant on dispersion robustness of polycarboxylate superplasticizers toward montmorillonite
摘要
Abstract
The effect ofβ-cyclodextrin (β-CD) pendant on the dispersion robustness of polycarboxylate superplasticizers (PCEs) toward montmorillonite was studiedvia cement paste test and concrete experiment. Compared with conventional PCEs only with PEO chains, the negative effect of montmorillonite on the spread flow of cement paste containing PCEs withβ-CD as pendants was weakened. When montmorillonite (1.0%, by mass of sand) was present, the dosage increment of PCEs withβ-CD pendants to achieve the same spread flow of concrete as that in the absence of montmorillonite was decreased, the compressive strength decrement of concrete containing PCEs withβ-CD pendants became reduced. These results demonstrated that PCEs withβ-CD as pendants displayed enhanced robustness toward montmorillonite, which was attributed toβ-CD pendant groups based on adsorption measurement. Due to the steric hindrance instigated from its rigid structure of hollow truncated cone,β-CD pendants would decrease the adsorption amount of PCEs on clay by hindering the sorption of polycarboxylate polymers on the surfaces of montmorillonite, leading to enhanced clay tolerance.关键词
分散/吸附/聚合物/β-环糊精侧链/聚羧酸减水剂/抑制蒙脱土负效应Key words
dispersion/adsorption/polymers/β-cyclodextrin pendant/polycarboxylate superplasticizer/dispersion robustness toward montmorillonite分类
建筑与水利引用本文复制引用
孙申美,徐海军,邵强..β-环糊精侧链对聚羧酸减水剂抑制蒙脱土的影响[J].化工学报,2017,68(5):2204-2210,7.基金项目
广州市科技计划项目(产学研重大专项,201604010027).supported by Guangzhou Science and Technology Innovation Committee (201604010027). （产学研重大专项,201604010027）
