自然浸泡环境下粉煤灰对水泥基材料孔结构的影响  

Influence of Fly Ash on Concrete Pore Structure in Natural Immersion Environment

作　　者：刘军[1,2] 谢友均[1] 邢锋[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1397-1400,1409,共5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：把不同配合比的混凝土及水泥净浆样品浸泡在超纯水中,通过比表面积分析仪定期检测样品的微观孔结构,研究在自然浸泡环境下粉煤灰对水泥基材料孔结构的影响。结果发现:自然浸泡环境下,水泥基材料的溶蚀作用明显,随着浸泡龄期的增长,孔体积增大;掺入粉煤灰,混凝土孔结构的发展受到粉煤灰使混凝土密实和溶蚀使孔结构劣化的双重作用影响,180 d时,粉煤灰对孔结构有利的因素起主导作用,混凝土的孔进一步细化,孔结构得到改善,浸泡270 d后,水的溶蚀作用比较明显,混凝土的孔隙率增大。Different mix proportions of concrete samples were soaked in ultrapure water,microscopic pore structure through periodic testing of the specific surface area analyzer samples to study the impact of fly ash concrete pore structure in the natural soak environment.The results showed that： The dissolution of the concrete was obvious in natural soak environment,the concrete pore volume increases with the growth of soaking the age;the development of the pore structure was influenced by fly ash and deterioration,Fly ash on the pore structure favorable factors played a leading role at 180 d,the pore structure has been improved,The dissolution of the water plays a dominant role at 270 d,the pore structure was deterioration.

关 键 词：孔结构 浸泡 粉煤灰 混凝土 

分 类 号：TU528[建筑科学—建筑技术科学]