应力对混凝土中氯离子渗透性的影响  

Influence of stress on chloride permeability in concrete

作　　者：王涛[1] 裴存栋 韩万水[1] 陈峰[1] 

机构地区：[1]长安大学公路学院,西安710064

出　　处：《吉林大学学报（工学版）》2015年第4期1102-1106,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51278064)

摘　　要：采用电导率法测试C30和C60混凝土中氯离子的扩散系数,并参照CCES01-2004标准对氯离子的渗透性进行评价,结果表明:在应力作用下,氯离子在C30混凝土中的渗透性比在C60混凝土中弱;氯离子在拉应力作用下的渗透性比在压应力作用下强;在压应力作用下,氯离子渗透扩散系数随着应力比的增加先减后增,压应力比为0.35时,氯离子渗透性最小;在拉应力下,氯离子渗透扩散系数随着应力比的增加持续上升,当应力比到达0.35时,扩散系数急剧增大。综合考虑下,混凝土在应力比为0.35时,氯离子的渗透性最低,对混凝土耐久性影响最小。The degree of diffusion of chloride in concrete is influenced by the stress. In this paper, chloride diffusion coefficients of C30 and C60 concretes are tested using co^nductj,vity method. The chloride permeability is evaluated according to CCES01- 2004 Standard. Results show that the chloride permeability of C30 concrete is weaker than that of C60 concrete. The chloride permeability under tensile stress is stronger than that under compressive stress, Under compressive stress, as the stress ratio increases, the chloride diffusion coefficient decreases first and then increases. The chloride permeability is the lowest under stress ratio of 0, 35, Under tensile stress, the chloride diffusion coefficient continuously increases with the increase in stress ratio, and when stress ratio reaches 0.35 it increases sharply. Under comprehensive consideration, when the stress ratio is 0.35 the chloride permeability is the lowest and it has minimal impact on the durability of concrete.

关 键 词：道路工程 氯离子渗透性 电导率法 扩散系数 

分 类 号：U416[交通运输工程—道路与铁道工程]