Observation of chloride permeability between normal aggregates concrete and recycled aggregates concrete containing fly ash and clay

Recycling of concrete is needed based on environmental preservation and effective utilization of resources point of view. Chloride attack has become a major concern in modern construction. Chloride ion is very dangerous for concrete structures because it leads to corrosion of the reinforcements in concrete. Many researchers have carried out numerous investigations on the chloride permeability of normal aggregates concrete. The purpose of this paper is to compare the chloride permeability between normal aggregates concrete and recycled aggregates concrete containing fly ash and clay. Water absorption in recycled aggregates concrete is also shown. The cylindrical concrete specimens made with recycled aggregates were subjected to high chloride permeability. Clay and ash were mixed in separate specimens in different proportions to reduce the porosity of concrete and hence to decrease the chloride permeability. The objective of this paper is to show the decrease chloride permeability in recycled aggregates concrete which is almost same for normal aggregates concrete and to make a relationship between water absorption and chloride permeability.


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