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Abstract(s)
O betão é um material de baixa ductilidade, apresentando uma diminuição da mesma com o aumento de tensões de rotura à compressão, no entanto, devido à sua enorme versatilidade, é muito utilizado na construção. Ao ser reforçado com fibras é possível ultrapassar essa fragilidade, garantir uma redução de custos associados à mão de obra necessária, além de uma possível redução do aparecimento de fissuras e consequentes aberturas no próprio betão. No âmbito deste estágio, realizado na empresa EUROMODAL, foram desenvolvidas uma série de atividades com o primordial objetivo da avaliação do comportamento mecânico do betão quando reforçado com fibras. Deste modo, foram efetuadas uma série de produções de betão e argamassa em ambiente laboratorial tendo estas sido analisadas tanto no estado fresco como endurecido. Assim, este relatório descreve todos os procedimentos efetuados no âmbito do seu tema central, focando também a importância de cada ensaio realizado, quer para os mais habituais como avaliação das resistências à flexão e compressão, passando por outros não tão comuns como módulo de elasticidade, capacidade da absorção de energia e CMOD – Crack Mouth Open Displacement. São também apresentados os equipamentos utilizados, resultados obtidos e conclusões retiradas, mantendo sempre a conformidade com as Normas em vigor. Com a realização destes ensaios de componente destrutiva, é possível avaliar e comparar a respetiva resistência mecânica do betão quando reforçado com diferentes tipos de fibras. Pretende-se que a adição de fibras possibilite a redução da diferença entre a capacidade resistente do betão e a consequente melhoria de resultados a nível de outros fatores como capacidade de absorção de energia e resistência à tração.
Concrete is a material of low ductility, presenting some decrease with the increase of tensions of rupture in compression. Nevertheless, due to its enormous versatility, is very used in the construction. When reinforced with fibers it is possible to overcome this fragility, guarantee a reduction of costs associated with the necessary labor, besides a possible reduction of the appearance of cracks and consequent openings in the concrete. With this internship, carried out in the company EUROMODAL, a series of activities were developed with the main goal of evaluating the mechanical behavior of the concrete when reinforced with fibers. In this way, a series of concrete and mortar productions were carried out in a laboratory environment and analyzed both in the fresh and hardened state. Therefore, this report describes all the procedures performed within its central theme, also focusing on the importance of each test performed, either for the most usual ones such as evaluation of the resistance to flexion and compression, passing through others not as common as modulus of elasticity, energy absorption capacity and CMOD – Crack Mouth Open Displacement. The equipment used, results obtained and conclusions drawn are also presented, always maintaining compliance with the Rules in force. By performing these destructive component tests, it is possible to evaluate and compare the mechanical strength of the concrete when reinforced with different types of fibers. It is intended that the addition of fibers will allow the reduction of the difference between the resistant capacities of the concrete and consequent improvement of results in other factors such as energy absorption capacity and tensile strength.
Concrete is a material of low ductility, presenting some decrease with the increase of tensions of rupture in compression. Nevertheless, due to its enormous versatility, is very used in the construction. When reinforced with fibers it is possible to overcome this fragility, guarantee a reduction of costs associated with the necessary labor, besides a possible reduction of the appearance of cracks and consequent openings in the concrete. With this internship, carried out in the company EUROMODAL, a series of activities were developed with the main goal of evaluating the mechanical behavior of the concrete when reinforced with fibers. In this way, a series of concrete and mortar productions were carried out in a laboratory environment and analyzed both in the fresh and hardened state. Therefore, this report describes all the procedures performed within its central theme, also focusing on the importance of each test performed, either for the most usual ones such as evaluation of the resistance to flexion and compression, passing through others not as common as modulus of elasticity, energy absorption capacity and CMOD – Crack Mouth Open Displacement. The equipment used, results obtained and conclusions drawn are also presented, always maintaining compliance with the Rules in force. By performing these destructive component tests, it is possible to evaluate and compare the mechanical strength of the concrete when reinforced with different types of fibers. It is intended that the addition of fibers will allow the reduction of the difference between the resistant capacities of the concrete and consequent improvement of results in other factors such as energy absorption capacity and tensile strength.
Description
Keywords
Betão reforçado com fibras Argamassa reforçada com fibras Ensaios destrutivos Resistências mecânicas EUROMODAL Betão fresco Betão endurecido Fibers reinforced concrete Fiber reinforced mortar Destructive tests Mechanical endurance Fresh concrete Hardened concrete