粉煤灰、矿粉混凝土氯离子扩散系数试验研究  

Study on chloride-ion-diffusion-coefficient of concrete mixed fly-ash and slag

作　　者：张巨松[1] 张微[1] 邓嫔[1] 韩自博[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168

出　　处：《混凝土》2014年第10期5-7,11,共4页Concrete

基　　金：国家自然科学基金(51278312)

摘　　要：研究了粉煤灰、矿粉混凝土和硫酸钠粉煤灰、硫酸钠矿粉混凝土的氯离子扩散系数。参照NEL法测试混凝土的氯离子扩散系数,表明粉煤灰混凝土、矿粉混凝土和硫酸钠粉煤灰混凝土、硫酸钠矿粉混凝土,随着粉煤灰、矿粉掺量的增加混凝土的氯离子扩散系数降低。28 d时硫酸钠混凝土氯离子扩散系数低于相应不加硫酸钠的混凝土,60-90 d时高于相应不加硫酸钠的混凝土。相同龄期矿粉混凝土、硫酸钠矿粉混凝土氯离子扩散系数低于粉煤灰混凝土、硫酸钠粉煤灰混凝土。粉煤灰和矿粉都能改善混凝土内部结构密实性。矿粉混凝土的抗渗性好于粉煤灰混凝土。硫酸钠对粉煤灰、矿粉混凝土60-90d耐久性不利。The NEL method is applied to investigate the chloride-ion-diffusion-coefficient of concrete which is added fly-ash,slag,Na2SO4 and fly-ash as well as Na2SO4 and slag.It was found that The chloride-ion-diffusion-coefficient of fly-ash concrete,slag concrete,Na2SO4 and fly-ash concrete and Na2SO4 and slag concrete are reduced along with the increasing of the fly ash,slag content.At 28 d,the chloride-ion-diffusion-coefficient of Na2SO4 concrete was lower than the corresponding concrete without Na2SO4.At 60 d,90 d,the chloride- ion-diffusion-coefficient of Na2SO4 concrete were higher than the corresponding concrete without Na2SO4.At the same age,The chloride- ion-diffusion-coefficient of slag concrete and Na2SO4 slag concrete were lower than fly-ash concrete and Na2SO4fly-ash concrete.Both fly-ash and slag can improve the density of the internal structure of concrete.The impermeability of slag concrete are better than fly-ash concrete.At 60 d and 90 d,Na2SO4 was disadvantage for the durability of fly-ash concrete,slag concrete.

关 键 词：粉煤灰混凝土 矿粉混凝土 氯离子扩散系数 抗渗性 硫酸钠 

分 类 号：TU528.01[建筑科学—建筑技术科学]