水泥浆水膜厚度的计算及在流动性中的影响  

Calculation of water film thickness and the effects on rheology

作　　者：陈嘉健[1] 雷元新[1] 徐畏婷[2] 黄知元 

机构地区：[1]佛山科学技术学院土木工程系,广东佛山528000 [2]深圳大学土木工程系,广东深圳518000 [3]广东长宏公路工程有限公司,广东广州511325

出　　处：《佛山科学技术学院学报（自然科学版）》2014年第3期49-56,共8页Journal of Foshan University(Natural Science Edition)

基　　金：2012年广东省交通运输厅科技项目计划资助(科技2012-03-007)

摘　　要：硅灰能有效提高混凝土强度和耐久性,但其对流动性的影响规律尚未能定量化。由于硅灰的作用体现在对胶凝材料填充密度和比表面积上的影响,本研究用单一参量水膜厚度综合其两方面的作用。通过实验测取掺硅灰胶凝材料的填充密度,水膜厚度可定量取为填孔外额外水量与胶凝材料比表面积的比值。本研究通过对34个掺硅灰水泥浆试样流动性的测量和水膜厚度对流动性影响的分析,揭示了水膜厚度在流动性中的根本控制作用。It is well known that condensed silica fume can effectively improve thc strength and durability of concrete, but its quantitative effects on rheology remains a difficulty. In this study, water film thickness, a single parameter combining the effects of both packing density and surface area, has been brought out. After obtaining the packing density of the condensed silica fume added cementitious materials, the water film thickness can be simply calculated by dividing the excess water by surface area. To find out the role of water film thickness, a total of 34 cement pastes samples were made with their rheology measured and their water film thickness calculated. It is concluded from the analysis that the rheology of cement paste was governed by the water film thickness.

关 键 词：比表面积 硅灰 流变性 水膜厚度 填充密度 

分 类 号：TQ172[化学工程—水泥工业]