The Analysis of Chloride Ion Penetration into a Concrete Structure in Marine Environment

J. Ocean Eng. Technol. 1998;12(3):68-74.

Cho, Sun-Kyu;Jeon, Gui;Shin, Chee-Burm;

해안환경하에 있는 콘크리트의 염분침투해석

조선규;전귀;신치범;

(주)서영기술단;동양중앙연구소;아주대학교 화학공학과;

Keywords: Cholride ion penetration, diffusion of chloride ion, reinforcement, corrosion, marine environment

핵심용어: 염분침투, 염분확산, 철근부식, 해안환경

Abstract

An increase of concrete construction in marine environments as well as an increasing use of marine aggregate at the mixing stage of concrete has provoked an important problem. A high concentration of chloride ion in the vicinity of steel bars in concrete is the principal cause of premature reinforcement corrosion in concrete structures. In this study, the behavior of chloride ions introduced into concrete from concrete surface by marine evironment was analysed. A mathematical model including the diffusion of chloride ion in aqueous phase of pores, the adsorption and desorption of chloride ions to and from the surface of solid phase of concrete and the chemical reactions of chloride ions with solid phase was presented. Finite element method was employed to carry out numerical analysis. The results of this study may be used to predict the onset of reinforcement corrosion and to identify the maximum limit of chloride ions contained in concrete admixtures.