Study Of Chlor Ion Diffusion From Seawater Into Concrete

Abstract

Reinforced concrete as the foundation of harbor and bridge is often damaged by the carbonation and corrosion. The presence of Cl‾ in seawater may diffuse into the reinforced concrete and can cause corrosion in concrete. This research investigated Cl‾ diffusion in concrete by analyzing Cl‾ concentration in concrete as function of depth and soaking time in seawater. The Cl‾ diffusion in concrete was based on Fick‘s Law. The results showed that Cl‾ concentration in concrete decreased with the increase depth. Moreover, Cl‾ concentration in concrete increased with the increase of soaking time in seawater. The simulation results using mathematical model showed that the value of Cl‾ diffusivity in concrete (DAB) decreased when soaking time rised. The range value of DAB is between 9.996x10-7- 2.225x10-7 cm2/s. The equilibrium constant of Cl‾ concentration in seawater with Cl‾ concentration in concrete tended to increase with the increase of soaking time, in the range of values from 0.0651 - 0.5002.