粉煤灰对混凝土表层渗透性能的影响  

Influence of Fly Ash on Concrete Surface Permeability

作　　者：刘军[1,2] 谢友均[1] 邢锋[2] 董必钦[2] 潘冬[2] 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]深圳大学土木工程学院深圳市土木工程耐久性重点实验室,深圳518060

出　　处：《硅酸盐通报》2013年第7期1242-1247,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金青年基金(51108271);国家杰出青年科学基金资助项目(50925829);深圳市科技计划项目(JC201005280569A;JCYJ20120613115622154);973计划(2011CB013604);广东省自然科学基金研究团队项目(9351806001000001)

摘　　要：把不同粉煤灰掺量的混凝土试件浸泡在超纯水中,通过表面渗透测试仪定期检测混凝土试件的表层渗水系数,研究粉煤灰对混凝土表层渗透性能的影响。结果发现:掺入粉煤灰量的大小对表层渗水性能的影响较大,标准养护28 d后,掺入比例为15%的粉煤灰混凝土和普通混凝土相比,表层渗水系数减小,当粉煤灰量达到30%时,表层渗水系数与普通混凝土几乎相等;随着浸泡龄期的增长,混凝土表层渗水系数不断减小;浸泡150 d后,两种粉煤灰掺量混凝土的表层渗水系数仅为普通混凝土试件的40%左右。Different fly ash concrete specimens were immersed in ultrapure water,the concrete surface specimen permeability were detected by the surface penetration tester for studying the impact of fly ash on the permeability of the concrete surface.The results showed that： fly ash amount Play an important role in concrete surface permeability,mixing ratio of 15% concrete surface permeability coefficient is reduced compared to ordinary concrete after standard curing 28 d,The surface permeability coefficient and ordinary concrete almost equal when the dosage of 30%;With the growth of the soaking instar,the surface permeability coefficient was continuously smaller,Fly ash sample surface permeability coefficient was significantly lower,Surface coefficient of water permeability of fly ash concrete is only about 0.4 of ordinary concrete.

关 键 词：表层渗水系数 粉煤灰 混凝土 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]