Modelling of chloride-induced corrosion of reinforcement in cracked high-performance concrete based on laboratory investigations

摘要

High-strength concrete with a compressive strength above 80 N mm~(-2) has been used for many years. Besides increasing the load-bearing capacity of the concrete one important aspect for the development of high-performance concrete mixtures is the durability, especially the resistance against chloride diffusion. Numerous investigations have been performed with regard to the abrasion resistance, capillary water suction, permeability to gases and liquids, chloride diffusion resistance or resistance against frost and de-icing salts . Nevertheless, questions remain with regard to the behaviour of the reinforcement in high-performance concrete structures when exposed to aggressive environmental conditions. Cracks in reinforced concrete structures allow aggressive agents like chlorides from de-icing salts or sea-water to penetrate into the concrete.