Recuperação de estruturas em concreto armado : os mecanismos de degradação no meio urbano e procedimentos de terapia

Abstract

Concrete structures, like all other materials used in construction, have a useful life. In urban areas, there are several factors that influence the loss of performance of reinforced concrete, which can result in major catastrophes. Through a study in the understanding of the phenomena that occur in the structures, it is possible to elaborate recovery methods in which it is possible to restore the original characteristics of the same. The carbonation of concrete is one of the main reactions that occur in concrete and causes major pathological manifestations. With this process, there is a reduction in the PH of the concrete that takes the reinforcements from the passivation state, with this the steel starts the corrosion process in which its section increases by up to 8 times, causing the concrete to rupture. Through on-site visits to special works of art in the city of Belo Horizonte, it was found several points presenting these pathological manifestations in their structure. To recover the concrete structure it is necessary to carry out specific procedures which will guarantee an extension of its useful life.