摘要
渗透性能包括氧的渗透性、毛细管水吸附作用、氯离子扩散性能等已经普遍地应用到混凝土耐久性的评价指标中。本文通过不同的自密实混凝土(SCC)与相同强度等级传统的普通振捣混凝土(REF)对比,分析自密实混凝土的渗透性能的试验研究。自密实混凝土的特性根据C40和C60的立方体强度掺有矿物掺合料或没有矿物掺合料但掺有粘性剂进行配合比设计。研究结果表明,自密实混凝土透氧率和吸附作用明显比相同强度基准的普通振捣混凝土低。但是氯离子扩散系数更多取决于矿物掺合料的种类;自密实混凝土中没有掺矿物掺合料但掺有粘性剂的比基准混凝土和其它自密实混凝土有更高的氯离子扩散系数。
Permeation properties, which include permeability, absorption, diffusivity etc., have been widely used to quantify durability characteristics of concrete. This paper presents an experimental study on permeation properties of different self-compacting concrete （SCC） mixes in comparison with those of selected traditional vibrated reference （REF） concretes of the same strength grade. The SCC mixes with characteristic cube strength of C40 and C60 were designed either with mineral admixture as filler or without the filler but using a viscosity agent. The results indicated that the SCC mixes had significantly lower oxygen permeability and sorptivity than the vibrated normal reference concretes of the same strength grades. The chloride diffusivity, however, appeared to be much dependent on the type of filler used; the SCC mixes without the mineral admixture but using a viscosity agent were found to have considerably higher diffusivity than the reference mixes and the other SCCs.
出处
《建筑科学》
北大核心
2007年第1期49-53,60,共6页
Building Science
基金
国家自然科学基金资助项目(500499333-4)
科技部科研院所技术开发研究专项资金项目(2003EG131152)
云南省院省校科技合作计划项目(2004YX31)
