Browsing by Autor "Cynthia Firmino dos Santos"

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DETECÇÃO DE INFILTRAÇÃO DEVIDO A CAUSAS ACIDENTAIS COM TERMOGRAFIA INFRAVERMELHA: ESTUDO DE CASO
(2020) Joaquín Humberto Aquino Rocha; Cynthia Firmino dos Santos; Yêda Vieira Póvoas
A infiltracao em edificacoes e um dos problemas mais frequentes e, na maioria dos casos, e produto de vazamentos em tubulacoes, defeitos de construcao, entre outros. Sua deteccao e dificil, uma vez que nao apresentam manifestacoes externas nas primeiras fases. A termografia infravermelha pode ser uma tecnica em potencial para detectar estes defeitos, uma vez que nao precisa de contato direto com a estrutura inspecionada e tem resultados em tempo real. Sendo assim, este artigo tem como objetivo a avaliacao da termografia infravermelha para detectar infiltracoes devido a causas acidentais. A metodologia do trabalho consistiu na inspecao das areas comuns de um condominio multifamilar com uma câmera termografica e o uso de um detector de umidade, de forma complementar. Os resultados permitiram comprovar que a deteccao foi possivel com gradientes termicos pequenos, em torno de 0,4°C a 1,5°C, onde as areas afetadas foram visualizadas com menor temperatura devido a inercia termica da agua. Na inspecao para verificacao de infiltracoes a tecnica apresentou rapidez na deteccao desta manifestacao patologica e pode ser utilizada, tambem, como uma ferramenta auxiliar.
Detección de infiltración por causas accidentales con termografía infrarroja: estudio de caso
(University of Costa Rica, 2020) Joaquín Humberto Aquino Rocha; Cynthia Firmino dos Santos; Yêda Vieira Póvoas
Infiltration in buildings is one of the most frequent problems and, in most cases, is the product of pipe leaks, construction defects, among others. Their detection is difficult, since they do not present external manifestations in the first phases. Infrared thermography may be a potential technique for detecting these defects, since it does not need direct contact with the inspected structure and has real-time results. Thus, this article aims to evaluate infrared thermography to detect infiltrations due to accidental causes. The methodology of the work consisted in the inspection of the common areas of a multifamily condominium with a thermographic camera and the use of a humidity detector, in a complementary way. The results allowed to prove that the detection was possible with small thermal gradients, around 0.4 °C to 1.5 °C, where the affected areas were visualized with lower temperature due to the thermal inertia of the water. In the inspection for infiltration verification, the technique showed a rapid detection of this pathological manifestation and can be used as an auxiliary tool
Detection of precipitation infiltration in buildings by infrared thermography: a case study
(Elsevier BV, 2018) Joaquín Humberto Aquino Rocha; Cynthia Firmino dos Santos; Yêda Vieira Póvoas
Infrared thermography has recently been used in civil work inspection to detect various types of pathological manifestations due to its speed, easy handling, and capability to cover large areas and detect hidden faults, among other advantages. The specific implementation for humidity detection in buildings still presents some uncertainties, since parameters that influence results are present, for example: mechanisms that generate humidity, specific conditions of premises being studied and constructive characteristics of the building. This work is intended to evaluate the infrared thermography technique for moisture detection originated by pluvial precipitation. In this sense, a building with pathological manifestations caused by precipitation was selected to be inspected at different times of the day in order to observe behavior of this problem during rainy season. Results showed that infrared thermography was sensitive to detect areas affected by precipitation humidity presenting lower temperatures than those sectors without any problem. Furthermore, the higher the temperature difference, the better definition of the area affected by the humidity was, thus allowing the location of potential spots. Infrared thermography was presented as an auxiliary tool for inspections, as it provided more information than a simple visual inspection; however, some factors must be considered in order for the inspection to be effective.
Evaluation of the infrared thermography technique for capillarity moisture detection in buildings
(Elsevier BV, 2018) Joaquín Humberto Aquino Rocha; Cynthia Firmino dos Santos; Yêda Vieira Póvoas
Moisture problems are very frequent in buildings and, in most cases, are only visible when they are in advanced stages, thus causing financial losses and damages, and presenting difficulties for repairing to owners. Among nondestructive tests available in the market, infrared thermography has the capacity to be applied for this type of problem, since it can identify hidden problems and inspect large areas besides being fast and easy. In this sense, this article is intended to verify infrared thermography applicability for moisture detection by capillarity in buildings. Work methodology was developed through inspection of a building that presented evident signs of moisture by capillarity as well as potential development of this type of problem. Inspections were carried out during rainy season, when this type of manifestation develops the most. During test period, it was possible to verify that infrared thermography can accurately detect areas affected by humidity. However, it does not provide any information about problem severity. The thermal gradient between affected and intact areas may indicate the best inspection times -which occur when these values are at the highest level- as well as times not suitable for this activity. Despite finding failures, thermography presents many limitations, as it is influenced by environmental conditions, inspection schedule and the type of material where an issue takes place.
Utilização da termografia infravermelha para detecção de focos de umidade em paredes internas de edificações
(Associação Nacional de Tecnologia do Ambiente Construído, 2018) Cynthia Firmino dos Santos; Joaquín Humberto Aquino Rocha; Yêda Vieira Póvoas
Resumo O uso da termografia infravermelha tem se tornado alvo de estudos em várias áreas dentro da construção civil. Contudo, as pesquisas de detecção de presença de umidade em edificações ainda estão em desenvolvimento. O objetivo principal deste artigofoi estudar a viabilidadedo uso da termografia para a detecção de infiltrações devido a causas fortuitas em paredes internas. A metodologia consistiu na confecção de paredes de alvenaria de tijolos cerâmicos com diversas configurações de revestimento: sem revestimento, com gesso, gesso com tinta base látex, gessocom tinta base acrílica e gesso com cerâmica assentada com gesso cola. Em cada protótipo foi inserida uma tubulação furada a fim de simular vazamento. O avanço da infiltração foi verificado por meio de termogramas, por um período de 2 h com vazão constante, com 48 h e uma semana após o início da simulação. Os resultados encontrados confirmam que a termografia pode ser eficaz na detecção da região que contém o foco da infiltração oculta, desde que o revestimento não seja impermeável. Esse fato pode ser observado por meio dos gradientes térmicos produzidos. Nos revestimentos porosos ∆T variou entre 2,6 ºC e 3,8ºC, e aqueles com características impermeáveis apresentaram ∆T máximo de 2,2ºC, indicando a influência direta do tipo de revestimentono tempo de surgimento da mancha de umidade de forma aparente.