粘土对聚羧酸减水剂性能的影响及机理研究  

Effect of Clay on Polycarboxylate Superplasticizer Performance and Mechanism Research

作　　者：王林[1,2] 王栋民[1] 包文忠[3] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]北京建筑大学土木与交通工程学院,北京100044 [3]新疆天山水泥股份有限公司,乌鲁木齐830013

出　　处：《武汉理工大学学报》2013年第8期6-9,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50872151)

摘　　要：粘土作为杂质存在于混凝土的组分如砂石中,粘土对聚羧酸减水剂有较强的吸附性,从而影响混凝土的工作性。研究了不同粘土对掺聚羧酸减水剂的水泥浆体及砂浆流动性的影响规律,探讨了聚羧酸减水剂与粘土的相互作用机理。研究结果表明,不同粘土对水泥浆体的流动性有不同程度的影响,蒙脱土和膨润土相对于高岭土及筛分土对砂浆的流动性影响更为显著;同时,相对于不掺聚羧酸的砂浆,粘土对掺聚羧酸减水剂砂浆的流动性影响更为显著。粘土自身的吸附性与疏水基的定向吸附共同作用及粘土中的金属离子与聚羧酸的螯合作用可能是粘土吸附聚羧酸减水剂的机理。As the impurities clay is present in the concrete components, such as sand. Clay has strong aclsorpnon ot poiyearboxylate superplasticizer and thereby affects concrete workability. Effects of day on the fluidity of cement paste and mortar mixed with polycarhoxylate superplastieizer are studied. Interaction mechanism between polycarboxylate su- perpiasticizer and clay is discussed. The results show that different days have varying degrees of impact on mortar fluidity and montmorilionite and bentonite day with respect to kaolinite and screening clay have more significant influence on mot tar fluidity. At the same time, rdative to non-mixed polyearboxylate superplasticizer mortar, clay has more significant in- fluence on fluidity of mortar mixed with polycarboxylate superplasticizer. Cooperative action between clay itself^s adsorp tion and directional adsorption of hydrophohic groups and chelation between metal ion in clay and polycarboxylate super- plasticizer may be the reason of clay adsorption of polycarboxylate superplasticizer.

关 键 词：粘土 聚羧酸减水剂 吸附 工作性 砂浆 

分 类 号：TU528.04[建筑科学—建筑技术科学]