摘要
以不同纤维掺量的聚丙烯纤维混凝土为研究对象,采用自然浸泡方法,研究氯离子在聚丙烯纤维混凝土中的迁移性能。结果表明,试件的氯离子含量随纤维掺量的增加而增多,扩散规律符合Fick第二定律。氯离子的扩散系数随着时间衰减且下降逐渐变缓;随着渗透深度的增加,结合氯离子逐渐减少;纤维的掺入改变混凝土内部的孔结构和孔隙率,随着纤维掺量的增加,氯离子在试件内部的含量加大。
In order to study the Cl-migration under long-term immersion of polypropylene fiber concrete with different volume,indoor artificial method was used to simulate natural immersion.The results indicated that Cl-content in the specimen increased with increasing fiber volume and diffusion in accordance with Fick＇s second law.The diffusion coefficient of Cl-decay over time and gradually slow down.As the penetration depth increases,Cl-binding gradually reduced.Fiber change the internal pore structure and porosity of concrete.With the increase of fiber volume,Cl-within the specimen increased.
出处
《四川建筑科学研究》
北大核心
2011年第5期247-250,共4页
Sichuan Building Science
关键词
聚丙烯纤维
混凝土
耐久性
氯离子
扩散
polypropylene fiber
concrete
durability
chloride ion
diffusion
