Estudo de caso das manifestações patológicas nos pilares de concreto armado de um condomínio localizado no bairro Mangabeiras

Abstract

The incidence of pathological manifestations in concrete structures is a process that can be observed when the performance of a building is below planned. Its origins are very diverse and attack the structures in different ways. In concrete, these pathological manifestations are responsible for its deterioration through chemical, physical, biological, electrochemical and mechanical processes. This work seeks to carry out a case study to identify the pathological manifestations present in the pillars of reinforced concrete structures, identifying the chemical agents responsible for their deterioration and preparing a technical report regarding the recovery. The recovery of structures is done to reestablish the building's conditions of use, ensuring the safety of users. The interventions carried out are responsible for removing aggressive agents and improving the structure's performance. The evaluation of chemical agents is carried out through three tests: carbonation, chemical analysis of chlorides and chemical analysis of ammonium. The presence of these aggressive agents is harmful to the structure, since chlorides and carbon dioxide are the main agents responsible for the start of the corrosion process. Carbon dioxide causes carbonation, which causes the breakdown of the protective layer that covers the concrete, while chlorides, when in their ionic form, attack the reinforcement at specific points.