A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Study for chloride ion diffusion in concrete exposed to a marine environment
Concrete usually provides a good barrier against corrosion to the steel reinforcement, due to its high pH, which is the responsible for keeping the passivity of steel. However, when it is exposed in a marine environment, the presence of chloride ions is very harmful to the passive film, increasing the susceptibility of the steel to corrode and damage the whole structure. Chloride ions are considered the main cause of premature failure of steel reinforcement, although corrosion occurs in absence of chloride ion under certain circumstances, being carbonation process also the responsible for occurring corrosion in concrete structures. Simple non destructive testing namely: Phenolphtalein test and free corrosion potential measurements were performed to evaluate the state of rebar concrete In this specific case the carbonation contribution is negligible which was observed using the phenolphthalein test. This study shows the corrosion potential measurement maps and zones of damage. Diffusion rate of chloride ions into concrete structures were obtained from the diffusion equation model, to evaluate the susceptibility of the steel reinforcement from a concrete structure to corrode in a marine environment after 25 years of exposure. From this diffusion equation it was estimated by modeling the useful life period of a concrete structure when it is exposed in marine environments for this structure.
Study for chloride ion diffusion in concrete exposed to a marine environment
Concrete usually provides a good barrier against corrosion to the steel reinforcement, due to its high pH, which is the responsible for keeping the passivity of steel. However, when it is exposed in a marine environment, the presence of chloride ions is very harmful to the passive film, increasing the susceptibility of the steel to corrode and damage the whole structure. Chloride ions are considered the main cause of premature failure of steel reinforcement, although corrosion occurs in absence of chloride ion under certain circumstances, being carbonation process also the responsible for occurring corrosion in concrete structures. Simple non destructive testing namely: Phenolphtalein test and free corrosion potential measurements were performed to evaluate the state of rebar concrete In this specific case the carbonation contribution is negligible which was observed using the phenolphthalein test. This study shows the corrosion potential measurement maps and zones of damage. Diffusion rate of chloride ions into concrete structures were obtained from the diffusion equation model, to evaluate the susceptibility of the steel reinforcement from a concrete structure to corrode in a marine environment after 25 years of exposure. From this diffusion equation it was estimated by modeling the useful life period of a concrete structure when it is exposed in marine environments for this structure.
Study for chloride ion diffusion in concrete exposed to a marine environment
Untersuchung der Chloridionendiffusion in Beton in einer Meeresumgebung
Munoz Ledo, R. (author) / Gonzalez Nunez, M.A. (author) / Malo, J.M. (author) / Uruchurtu Chavarin, J. (author)
2009
7 Seiten, 10 Bilder, 210 Tabellen
(nicht paginiert)
Conference paper
Storage medium
English
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