Research On Reinforcement Crossion Of Air-Entrained Concrete

Now in the world, the reinforcement corrosion was considered as the most primary factor of the concrete structure deterioration and durability deficiency. The economic loss caused by the reinforcement corrosion is extremely huge. The problem of the reinforcement corrosion has already drawn the wide attention of the academic circles, and has been conducted the massive research. However the reinforcement corrosion of air-entrained concrete has not been taken into the systematic research. In the northern area of our country, the climate is so cold, that the frost damage is very serious, especially in the northeast. Induced air into the concrete is the most efficient way to improve the behavior of the frost resistance. Therefore, studying on the reinforcement corrosion of the air-entrained concrete has important significance.This paper takes the reinforced concrete of different water cement ratio, different air-content and different kinds of air-entraining agent as the object of the research. and takes the method of passing electricity in wet environment to carry on the reinforcement corrosion acceleration to the reinforced concrete, and uses the linear polarization method to carry on the test to the polarized resistance and corrosion current density of the steel bar flowed through by electricity at different time, analyzing the rule of the change of the reinforcement corrosion parameters, and test the chloride ion diffusion coefficient to evaluate the impermeability of the concrete. The result indicates that when the air content of the concrete changes from 1 to 4 percent, the polarized resistance of the identical flow electricity time increases along with the increment of the air content, the corrosion current density reduces along with the increment of air content, the chloride ion diffusion coefficient reduces with the increment of air content; When air content changes from 4 to 6 percent, the rule of the change of the polarized resistance and corrosion current density happens to be the opposite, the diffusion coefficient of the chloride ion increases along with the increment of air content; When the air content is 4 percent, the rust-resisting property of concrete is best, and so is the impermeability of the concrete. The chloride ion diffusion coefficient and the reinforcement corrosion parameter have a good correlation in...