Análise de manifestações patológicas em edifício no Centro Histórico de São Luís-MA: um estudo de campo com aplicação de Fenolftaléina para avaliar a frente de carbonatação na edificação

Abstract

In this research, the pathological manifestations of the old building of Seduc were analyzed, characterizing the building, pathological manifestations and identifying the carbonation front in columns, beams and slabs through a test with a pH indicator Phenolphthalein, colorless at a pH range less than or equal to to eight and carmine red in the upper bands, where the carbonated band is measured in millimeters. The test consists, using a sledgehammer and chisel, breaking the concrete until exposing the reinforcement of the structural element, cleaning with a brush, checking the reinforcement cover thickness, applying the Phenolphthalein and waiting for the reaction, which is fast, the non-carbonated concrete is red-carmine in color. A total of twelve structural elements were analyzed, six columns, four beams and two slabs, of which only one slab was not carbonated. The old Seduc building has some elements that require more rigorous care, but this is based on the building's utilization plan, the test carried out is not a preponderant factor to determine the risks of these elements.