Os efeitos da variação de temperatura nas medidas de resistividade elétrica superficial do concreto

• Ano de defesa: 2018
• Autor(a) principal: Leticia Couto de Aguiar
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Concreto; Resistividade elétrica superficial; Temperatura; Método Wenner; Materiais de construção; Construção civil
• Link de acesso: http://hdl.handle.net/1843/RAOA-BAUM5N

The electrical resistivity is an important physical property of concrete, directly related to its ability to oppose the passage of electric currents, originating from the corrosive process of the reinforcement. Studies related to the maintenance and prediction of service life of structures of reinforced concrete have increasingly addressed resistivity as a parameter of durability and quality. It is known that the resistivity depends not only on the microstructure of the material, but also on the environmental conditions around the structure. Thus, the present work has as objective to analyze the variations of the surface electrical resistivity of concrete caused by intrinsic and extrinsic factors, focusing on the changes caused by the temperature variation. For the accomplishment of the study, three experimental stages were realized. During the first stage were verified the changes that occur along the cure and due to different water / cement ratios. During the second stage the variations that normally occur in the resistivity values of the concrete along different day hours in a structure that is exposed to the environment were evaluated. In the third step, the performance of temperature as an isolated factor was studied, and its role as an agent that causes changes in the surface electrical resistivity of the concrete. The results show that the temperature change can lead to significant variations in the surface resistivity values of the concrete