Study on Diffusion of Nitrite Ions in Concrete and on Protective Effect of Nitrite

摘要

This paper presents the diffusion model of nitrite ion in concrete and predict model for inhibition effect of reinforced concrete based on the diffusion equation of Fick's second law when the concrete surface is brushed with nitrite solution. The influence of the amount of nitrite solution on inhibiting duration is also discussed through a simulation analysis when the amount of solution is 250g/m~2, 500g/m~2, 1000g/m~2 and 1500g/m~2 respectively. This study confirms that nitrite ion can diffuse well in concrete to reach an effective mol ratio from the surface of the concrete to the surface of the reinforcement, and have an effective protection for the bars against corrosion. It will help increase the tendency of inhibiting duration and prolong the life of reinforced concrete.