Avaliação do comportamento mecânico de vigas de concreto com falha crítica reforçadas com compósito laminando de fibra de carbono

• Autor(a) principal: Ferreira, Danilo de Souza Salgueiro
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/7982
• topic: Concrete; Composite materials; Repair; Materiais compósitos; Reparo; Materiais compostos Ensaios mecânicos; Concreto - Ensaios mecânicos; Fibras de carbono; Construção de concreto Deterioração; Concreto Mistura; Resistência de materiais; Materiais Testes; CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS::MATERIAIS CONJUGADOS NAO METALICOS

Concrete structures are very common in civil construction, because this material has several characteristics that contribute to its great acceptance. Despite this, concrete is subject to factors that can affect its service conditions and shorten its life. The use of laminated composite materials for the reinforcement or rehabilitation of these structures is an effective practice that is becoming popular thanks to advantages observed in relation to other more traditional techniques of interventions. This work was undertaken to study the mechanical behavior of prismatic concrete specimens under conditions of repair and reinforcement submitted to the three-point flexural strength test. In the reinforcing condition, intact specimens received a surface sanding treatment and subsequent bonding of the composite material with an epoxy-based adhesive. In the repair condition, a notch was introduced at half the length of the specimen being later filled with adhesive. In this case, sanding was also carried out on the surface of the specimen, as well as the bonding of the composite material. An intermediate situation was also studied, consisting only of filling the notch with the adhesive. The S&P 220 and NVT 201E structural adhesives were used. When reinforced, the flexural strength of the specimens obtained increments of approximately 2.59 times with the use of the S&P 220 adhesive and approximately 6.45 times with the use of the NVT 201E adhesive. When repaired, use of the S&P 220 adhesive gave an increase of about 6.60 times in control ratio, while the use of the NVT 201E adhesive contributed with increases of approximately 3.45 times over the control conditions. Increases of up to 23.72% were achieved with the S&P 220 adhesive while the use of the NVT 201E adhesive resulted in flexural strength increases of up to 52.41%.