STUDY ON THE VERIFICATION OF STEEL CORROSION IN PORT REINFORCED CONCRETE STRUCTURES BASED ON SITE SURVEY AND LONG TERM EXPOSURE TEST

Abstract

For the verification of steel corrosion in upper deck of wharf type structure, a critical chloride concentration for initiation of steel corrosion (C_lim), a chloride ion concentration at the concrete surface (C₀) and an apparent diffusion coefficient (D_ap) were investigated based on site survey and long term exposure tests. For C_lim, 2.0 kg/m³ is proposed in port reinforced concrete structures, based on long term exposure test in the pool which tidal and submerged conditions were simulated. For C₀, it is proposed that C₀ is varied linearly with the distance between H.W.L. and concrete surface. For D_ap, it is proposed that characteristic value of diffusion coefficient is obtained by multiplying the estimation equation of ‘JSCE standard specification for concrete structures’ by 0.65 in case of normal portland cement.