引气减缩混凝土外加剂表面张力研究  

Surface tension of air-entraining and shrinkage-reducing concrete admixture

作　　者：于继寿[1] 吴志刚[1] 葛勇[1] 袁杰[1] 张宝生[1] 郑秀华[1] 

机构地区：[1]哈尔滨工业大学材料学院,哈尔滨150001

出　　处：《混凝土》2006年第5期27-29,共3页Concrete

基　　金：交通部西部交通建设科技资助项目(No.200331882008);国家西部交通建设科技项目:水泥混凝土抗冻融耐久性

摘　　要：本文研究了几种常见的混凝土外加剂(引气剂、减水剂、减缩剂)对水以及饱和石灰水的表面张力的影响。研究表明,引气剂、减缩剂可以大幅降低水及饱和Ca(OH)2溶液的表面张力,减水剂可以降低水的表面张力,但在饱和石灰水中表面活性碱弱。同时由表面张力的变化曲线确定各种外加剂的临界胶束浓度(CMC),为实际工程中外加剂的品种选择和最佳掺量提供了理论参考。The influences of six concrete admixtures （air entraining admixture, water-reducing admixture and shrinkage-reducing admixture） on surface tension of water and saturation calcium hydroxide （Ca （OH）2） solution were investigated in this paper. The results show that air entraining admixture and shrinkage-reducing admixture can decrease surface tension of water and Ca （O14）2 solution observably. Water-reducing admixture can reduce surface tension of water but has no notable effects on surface tension of saturation calcium hydroxide solution. Critical micelle concentration （CMC） of every admixture is decided from surface tension curve, which is theory reference for kind choosing and optimal dosage of admixture in civil engineering.

关 键 词：表面张力 表面活性剂 临界胶束浓度 

分 类 号：TU528.042.4[建筑科学—建筑技术科学]