钢纤维掺量对混凝土氯离子渗透性能的影响研究

Effects Research of Steel Fiber Content on Chloride Ion Permeability of Concrete

采用自然浸泡法模拟海洋环境开展钢纤维混凝土氯离子侵蚀试验,研究了钢纤维掺量对混凝土自由氯离子含量、氯离子扩散系数的影响,得到混凝土中自由氯离子含量与氯离子扩散系数都随着钢纤维掺量的增加有先减小后增大的变化趋势;分析钢纤维混凝土氯离子扩散系数的时间依赖性,认为钢纤维混凝土氯离子扩散系数是随着时间的推移而逐渐衰减的;回归计算得出氯离子扩散系数的时间衰减系数,并给出钢纤维混凝土氯离子扩散系数的时间衰减系数的建议值;最终建立了钢纤维混凝土氯离子扩散系数随钢纤维掺量变化的时间衰减模型。

The experiments of chloride ion corrosion for steel fiber concrete is carried out by simulating marine environment which is conducted by using natural immersion method. The influence Of steel fiber content on chloride ion content of concrete, chloride ion diffusion coefficient is studied, the chloride ion content of concrete and chloride ion diffusion coefficient decrease firstly then increase with the increasing of steel fiber content; and the time dependent of chloride ion diffusion coefficient for steel fiber cocnrete which decays graudally through time, is analyzed. The time attenuation coefficient of chloride ion diffusion coefficient is calculated through regression analysis. The time attenuation coefficient of chloride ion diffusion coefficient of steel fiber concrete is proposed. At last, the time attenuation model of chloride ion diffusion coefficient for steel fiber concrete with steel fiber content varying is built.