除冰盐环境下纤维混凝土的耐久性研究  

Durability of Fiber Concrete Exposed to De-icing Salt

作　　者：王晨飞[1] 牛荻涛[2] 焦俊婷[1] 

机构地区：[1]厦门理工学院土木工程与建筑学院,厦门361024 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《硅酸盐通报》2016年第10期3126-3131,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金项目(51478404);福建省科技厅青年创新项目(2016J05141);福建省教育厅A类项目(JA14241);厦门理工学院高层次人才项目(YKJ13029R)

摘　　要：为了研究除冰盐环境下聚丙烯纤维混凝土的耐久性能,采用干湿交替与盐冻循环方式模拟除冰盐环境,分析纤维混凝土的物理力学性能、质量损失、动弹模损失、氯离子含量分布及微观结构。结果表明,纤维混凝土在除冰盐环境下的抗折强度、质量及动弹模的损失率随纤维掺量增加而减少;纤维掺量为0.1%的试件内部致密,随纤维掺量继续增大,试件的抗氯离子侵蚀能力减弱;试件表面氯离子富集区随循环次数增加而向内迁移;氯离子扩散系数随干湿交替次数增加而减小,随盐冻循环次数增加而增大。In order to study the durability performance of Polypropylene fiber(PPF) concrete exposed to de-icing salt,the dry-wet cycle and freeze-thaw cycle are used to simulate de-icing salt environment. The change law of The mechanical properties,mass loss,relative dynamic elastic modulus,chloride ion concentration distribution and microstructure are analyzed. The results show that the loss ratio of flexural strength,mass and relative dynamic elastic modulus reduce with the increase of fiber content. The specimen with 0. 1% fiber content is characterized by dense microstructure,with the increase of fiber content,the chloride ion erosion resistance of the specimens is weaken. The chloride enrichment region of the specimen surface migrates inward with the increase of cycle times. The chloride ion diffusion coefficient decreases with the increase of times of dry-wet cycles,and increases with increasing freezethaw cycles.

关 键 词：除冰盐环境 聚丙烯纤维混凝土 耐久性能 氯离子 扩散系数 

分 类 号：TU528[建筑科学—建筑技术科学]