DETERIORAÇÃO EM ESTRUTURAS DE CONCRETO ARMADO: Dimensionamento de elementos estruturais (lajes e vigas) em Estação de Tratamento de Esgoto

Abstract

The aggressiveness of the environment where the reinforced concrete structures are inserted is a major factor in the durability of it, so the structures should be well designed in accordance with the current standards to minimize the attack of aggressive agents. This study quests to identify the main fator of the reinforced concrete structure of a spoiled Sewage Treatment Station, and to propose a solution for it. Based on the data survey on the structure, it was notorious that this is in a state of colapse, due to the advanced degree of deterioration of structural parts (beams and slab), with great loss of cross section and reinforcement corrosion. It is also realized with the analysis of data that the main pathogenic agent is the sulfate, which by the action of anaerobic bacteria produce hydrogen sulfide and then in contact with aerobic bacteria present in sewage surface is transformed into sulfuric acid, causing the decomposition of the hardened cement paste, paving the way for other attackers. So, as a solution indicative, it was decided to run a new Project of beams and slab, obeying all the design parameters required by current standards, with particular emphasis on sanitation facilities.