胶凝材料用量对自密实混凝土氯离子扩散系数的影响研究  

Cement it ious materials content on the diffusion coefficient of chloride ion of self- compact ing concrete

作　　者：徐志辉[1] 韦江雄[1] 李方贤[1] 余其俊[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《混凝土》2014年第7期73-75,共3页Concrete

基　　金：国家"十二五"科技支撑计划项目(2011BAE27B02-3)

摘　　要：对比研究了不同胶凝材料用量（465~560kg／m3）对自密实混凝土工作性能、力学性能以及氯离子扩散系数的影响。试验表明，随着胶凝材料用量的增加，自密实混凝土的氯离子扩散系数先降低后升高；当胶凝材料用量较低时，混凝土内部大孔较多，ITZ结构松散，抗渗性较差；随着胶凝材料的增加，混凝土更密实，大孔减少而毛细孔相对增多，ITZ也越来越致密，界面变窄，抗渗性较好；当增大到一定用量时，界面孔隙率会稍微增加，抗渗性劣化。The cementation materials content（465-560 kg/m3）on the work performance,mechanical properties and the diffusion coeffi- cient of chloride ion of the self-compacting concrete was studied.Experimental results showed that with the increase of cementitious materials,the diffusion coefficient of chloride ion of self-compacting concrete first and then decreased.When the cementitious material was low, there were more large pores inside the concrete, and the interracial transition zone structure was loose, then the impermeability was poor.With the increase of cementitious materials, the concrete was more dense, and the macroporous pores reduced the relative increase, the interfacial transition zone increasingly dense,the interface became narrower,better impermeability.When increased to a certain amount, the interracial transition zone will be slightly increased porosity, permeability deteriorated.

关 键 词：自密实混凝土 氯离子扩散系数 孔结构 界面过渡区 

分 类 号：TU528.041[建筑科学—建筑技术科学]