A influência das condições climáticas na durabilidade dos revestimentos de fachada: estudo de caso na cidade de Goiânia GO

• Autor(a) principal: FREITAS, Juliana Gomes de
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/1346
• topic: Patologia; Fachada; Chuva Dirigida; Insolação; Manchamento; Pathology; Facade; Wind-driven rain; Insolation; Staining; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::CONSTRUCAO CIVIL

The climatic elements are related to the deterioration of the facades of buildings. Understanding the joint action of rain, wind and sunshine is important for prevention of pathological manifestations, thus ensuring the durability of coatings. Then, it becomes essential to know about the mechanisms of heat and moisture in porous materials. The problems related to this phenomenon are many, including the dimensional variation, which can cause cracks. The solar orientation and the presence of architectural details on the facades can cause the existence of the wettest spots, which favors the deposition of pollutants and microorganisms, causing stains. Thus, this paper aims at analyzing and understanding of issues that address the durability of facade coatings based on the understanding of the influence of climatic factors in buildings of the School of Engineering of the Federal University of Goiás (UFG), in Goiânia. Methodologically, the study aimed to: conducting a survey in order to quantify and map the pathological manifestations present, measurements of surface temperature and humidity in the dry and rainy seasons, trying to relate them to the cardinal orientations, creation of maps of wind-driven rain using data from the meteorological station of UFG, and conducting thermographic images, also in the rainy and dry seasons. The main results, it was found that the facades are exposed to different levels of humidity and temperature, which may favor the further deterioration of these. It was found that the north façade is the one that receives more sunlight in both the rainy and dry season, contributing to a high rate of fissuration. The same orientation is also one of the most humid and with higher levels of staining, consolidated information through wind-driven rain, that in the months of January and February 2012 reached one of the highest values. It was also observed that among the sites chosen for the measurements of surface moisture and temperature, the more prone to deterioration are the architectural details, as reached the highest values. In relation to infrared thermography, it was found that the best time of year for inspections was in the dry season and in the afternoon. In these periods, it was possible to identify pathological manifestations in the facades, such as stains, cracks and fantômes. An example is the case of the cracks which had a temperature 1°C lower than the part of the masonry without defects. It was also possible to visualize moist spots, as well as the lining of the points that were on the masonry and structure.