Levantamento técnico dos problemas patológicos dos edifícios da UEMG - Unidade de João Monlevade: efeitos e condutas de intervenções

Abstract

<jats:p>This article has the objective to present a technical survey of building pathologies from Universidade do Estado de Minas (UEMG) – Unit João Monlevade. Pathological problems of the buildings were surveyed and the main causes and effects were pointed out according to technical literature. The pathologies were analyzed using the three basic steps of a methodology proposed by Lichtenstein, which consists of information collection, diagnosis and conduct definition. Building inspections, non-destructive tests to verifying the concrete degradation due to carbonation, Schmidt hammer test to determining the mechanical strength of the concrete were carried out. Besides the non-destructive tests, the maximum deflection of some system floors was determining to better understanding the occurred phenomena. The data collected in the survey were analyzed and the causes, correction and repair measures were defined to each studied pathology. The main identified pathologies were fissures in the masonry, excessive deformation of the system floors, carbonation, steel corrosion of reinforced concrete and infiltrations. An overview of the pathological problem analyses provides the confirmation that the most anomalies were associated to execution and/or design errors, allied to the lack of preventive maintenance of building elements.</jats:p>

Application of the GUT technique in pathological manifestations in reinforced concrete structures and their corrections

“…The many stages of this work were structured according to the flowchart of activities shown in Figure 1. The methodology of visual inspections is recurrent in research of pathology analysis in structures (Morais et al, 2020;Silva Júnior et al, 2020;Cirino et al, 2020). The flowchart (Fig.…”

“…These agents can attack the concrete, reducing its pH and accelerating the steel oxidation. Over time, this process will expand the section of steel, causing cracks and loss of section (Moreira, 2015;Silva Júnior et al, 2020). In this way, Brazilian Standard NBR 6118 (ABNT, 2014) stablish a minimum reinforcement cover considering environmental aggressivity.…”

“…The lack of concrete cover thickness in reinforced concrete is one of the main failures in civil construction, and this is the main cause of the steel corrosion (Liberati et al, 2014;Medeiros et al, 2017;Silva Júnior et al, 2020). Besides that, other factors may be responsible for the appearance of these manifestations, such as the high porosity of the concrete matrix due to the high water-to-cement ratio and the presence of aggressive agents incorporated into the concrete matrix at the time of the structure's execution, with were already explained earlier.…”