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PENETRATION RATE OF CHLORIDE IN MARINE CONCRETE STRUCTURES
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1982
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Effective Diffusion CoefficientEngineeringCorrosionEnvironmental EngineeringCivil EngineeringConcrete TechnologyReinforced ConcreteMarine MaterialsSurface ConcentrationCorrosion InhibitionCement-based Construction MaterialCorrosion ResistanceConcrete StructuresStructural EngineeringChloride Penetration
Chloride penetration has been studied in some 15-20 years old concrete structures in the Danish Store Baelt area. The penetration follows an expression for diffusion in a semiinfinte system with constant surface concentration. The effective surface concentration is found to 0.12-0.77 wt% Cl and effective diffusion coefficient to range from 1.3 to 8.9 x 10 to the minus 8 sq cm/sec. The surface concentration decreases to the original chloride content from about 15 m above water-level. About 40% of total chloride is water soluble but this percentage decreases with decreasing total chloride content. The critical condition for corrosion in the reinforcement is found to be about 0.06 wt% chloride in the concrete (equal to approx. 0.12 g mol Cl pr litre in the pore water) but the corrosion attack is strongly dependent on the supply of oxygen. (Author)