Concrete Durability. Influence of chloride ions concentrations in mixing water and dissolution

Abstract

The most aggressive situation which is responsible for most of the cases of steel reinforcement corrosion in concrete, takes place when chlorides are present in the environment. These chlorides destroy the passivating film of steel and promote the denominated pitting corrosion. In order to study the demonstrated corrosive action of chloride ions on concrete structures, a number of experiments have been designed, to quantify the effect of different amounts of this ion in concrete. Several mixes have been prepared with portland cement type II-C-35 to which it has been added, as an additive in mixing water, NaCl in increasing concentrations. The samples obtained were submerged in different dissolutions of NaCl. From the results obtained it is clear that the chloride content in mixing water does not affect the flux of calcium ions; however, its influence on the flux of chloride ions is significant. Likewise, it is confirmed that the existence of chloride ions in dissolution influences the migration of calcium and chloride ions.