Abstract
Reinforced concrete (RC) structures are gradually being degraded all over the world, largely due to corrosion of the embedded steel bars caused by an attack of chloride penetration. Initial curing would be regarded as one factor influencing chloride diffusion in concrete in combination with cover cracking that is also of great attention for reinforced structures. In this study, a non-steady state diffusion test of chloride ion involving RC beam specimens with a water-to-cement ratio of 0.5, initial curing temperatures of 5°C or 20°C and three types of crack widths ranging from 0 to 0.2mm was performed. Chloride content at 5°C or was determined. The results show that the higher chloride content was obtained in condition of crack width large than 0.1mm with low initial curing temperature and there are no obvious differences in chloride content when the crack width was not larger than 0.1mm.
Highlights
A durable reinforced concrete structure must withstand the couple actions of environment and loads over its service life, as well as various actions such as wind, rain, cold, heat, ambient... while maintaining its aesthetic
Concrete structure may suffer complicated stress conditions of compression or tension leading to inevitable cracks due to the weakness of concrete in tension, which have a deep effect on chloride diffusion [3] and may results in different crack widths distribution within the change of concrete under different external loads, causing an easy way to chloride diffusion [4]
In order to explore the effects of initial curing temperature and width of concrete crack on chloride diffusion, a non-steady state accelerated migration test method was employed and developed in our laboratory basing on forcing chloride ion to penetrate through cover using electrical field
Summary
A durable reinforced concrete structure must withstand the couple actions of environment and loads over its service life (physical, chemical, mechanical...), as well as various actions such as wind, rain, cold, heat, ambient... while maintaining its aesthetic. Chloride penetration is one of the frequent aggressive agents affecting durability of reinforced concrete structures by corrosion of steels bars, which leads to the deterioration and even collapse of concrete structures [1]. Concrete structure may suffer complicated stress conditions of compression or tension leading to inevitable cracks due to the weakness of concrete in tension, which have a deep effect on chloride diffusion [3] and may results in different crack widths distribution within the change of concrete under different external loads, causing an easy way to chloride diffusion [4]. Many researchers have studied chloride diffusion through concrete structures separately without considering the couple effects of an external load and aggressive agent in service environment [8]. The combined effects of initial curing temperature and loading crack width on chloride permeation have been experimental investigated. The non-steady state accelerated migration test was employed to explore chloride concentration
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