A influência de pozolana na mitigação da corrosão de armaduras em compósitos cimentícios

Abstract

This study shows the state of art about the use of pozzolana in cement composites against corrosion of steel in reinforced concrete. The objective of this work is verify the addition of pozzolana in cement composites as a way to soften the pathological manifestation of the corrosion of steel in reinforced concrete, considering the analysis of experiments in electrical resistivity of corrosion and electric potential of corrosion. For this puporse, were made consultations in articles, journals, dissertations, theses, textbooks, etc. Positive results referring to the addition of pozzolan in order to improve the properties of cement matrix products have been published, arousing new methodologies and the materials development with the focus on improvement of performance and durability. It is known that the addition of pozzolan promotes porosity reduction and resistance gain, contributing with a better physical protection against the action of deleterious agents that are closely related to the manifestation of the phenomenon of corrosion in the reinforcement concrete of buildings. The corrosion is one of the most worrisome pathological manifestations of civil construction. When the pozzolana is used in the correct proportions in relation to Portland cement and to the aggregates, it promotes more cohesive and less permeable cementitious composites, providing the reduction of interconnected pores. Because of their characteristics, the pozolana contribute to the mitigation of pathological manifestations in steel. Several researchers have been experimentally proven over the years the effective contribution of pozzolana in relation to the durability of structures. Experiments in electrical resistivity of corrosion and electrochemical potential of corrosion were essential for this consensus to remain solid in the scientific community.