低品质砂对聚羧酸减水剂性能影响及改善措施研究  

Influence of Low Quality Sand on Property of Polycarboxylate Superplasticizer and Research on Improvements

作　　者：王方刚[1,2] 郭飞[1,2] 陆加越[1,2] 赵爽[1,2] 肖亮亮[1,2] 

机构地区：[1]江苏苏博特新材料股份有限公司,南京211103 [2]江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,南京210008

出　　处：《混凝土与水泥制品》2016年第1期18-22,共5页China Concrete and Cement Products

摘　　要：通过总有机碳吸附试验,初步探究影响砂浆流动性的原因,再结合荧光、XRD和SEM,对具代表性的骆马湖砂黏土矿物成分进行分析,并研究其改善措施及开发抗泥剂。结果表明,聚羧酸减水剂主要被骆马湖砂黏土矿物中蒙脱土大量吸附,这类型砂会严重降低聚羧酸减水剂的塑化性能;提高水胶比和减水剂掺量均能明显增加砂浆的流动性;开发出的两款抗泥剂KNJ-1和KNJ-2均能增大砂浆流动性,降低砂浆的流动度经时损失,可全过程发挥作用;同时,KNJ-1+KNJ-2具有良好的协同效果,"隔离与阻止"共同作用下好于单独使用的效果。Research on cause of mortar flowability by total organic carbon adsorption test preliminary, and the constituents of clay minerals of Luoma sand by XFR, XRD and SEM are studied, while the improvement measures and anticlay agents are researched. The results show that montmorillonite are contained in Luoma sands, adsorption a large number of polycarboxylate superplasticizer is the main cause of reduced mortar fluidity. Improving water-cement ratio and increasing the dosage of polycarboxylate superplasticizer can increase the fluidity of mortar, but both methods have certain limitations. Anti-clay agents of KNJ-1 and KNJ-2 can effectively increase the mortar fluidity and reduce the mortar fluidity with time loss in the process. KNJ-1 and KNJ-2 have a good synergistic effect, better than the KNJ-1 and KNJ-2 used alone by ＂prevention and isolation＂.

关 键 词：聚羧酸减水剂 蒙脱土 砂浆 抗泥剂 流动度 总有机碳吸附 

分 类 号：TU528.042[建筑科学—建筑技术科学]