Effect of admixtures on the corrosion of reinforced concrete structures

Ricardo Velásquez, María Acosta, Citlalli Gaona, Facundo Almeraya, Alberto Martínez

Abstract


This paper aims at determining the influence of additives in the corrosion of reinforced concrete structures by using electrochemical techniques. Theirinfluence on the mechanical properties is determined . The authors perfomed chemical analyses of the additives, characterizing the steel measure the pH,and evaluat the compressive and flexural strength of the concrete, the porosity and water absorption. The methodology was carried out according to ASTMand ACI standards. The action of the admixtures was evaluated and their effects on the corrosion of reinforced concrete were measured using corrosionpotentials and corrosion rates. The carbonatation and penetration of chlorides was also determined. The study was suplemented by a morphologiccharacterization using a scanning electron microscope. Specimens with and without reinforcement were elaborated, three of each were tested for obtainingan average. Prismatic specimens without reinforcement were also cast with the following chemical additives: Air-entraining, plasticizers, retardants,accelerating, coloring and fly ash. After curing, they were exposed to an aggressive atmosphere with sodium chloride. The corrosion potential in accordanceto ASTM C876 standard, revealed that cylinders had corrosion, and the rate corrosion of the cylinders exposed in sodium chloride corresponds a of moderatecorrosion degree.

Keywords


Admixture; corrosion; concrete; chloride; corrosion potential; corrosion rate

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