Contribuição ao estudo da aderência de barras de aço em concreto autoadensável reforçado com fibras metálicas

• Autor(a) principal: Tojal, Thaise Lima
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal de Alagoas (UFAL)
• Texto Completo: http://repositorio.ufal.br/handle/riufal/402
• topic: Self compacting concrete; Steel fibers; Adhesion; Concreto autoadensável; Fibras de aço; Aderência; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

One of the conditions of existence assigned to the concrete as a building material is the adhesion between the concrete and steel. This adhesion has been the subject of several research studies that give rise to models that mathematically describe the behavior of adhesion; present testing techniques and in analysis of the influence of different factors that affect the concrete-steel adhesion. With the technological advancement of the concrete there were some special concrete compositions which contain chemical additives and minerals, and fiber, as is the case of self compacting concrete and concrete reinforced with fibers. These special concretes have shown different behavior compared to conventional concrete, contributing to an improved system of steel-concrete adhesion. Thus, this study used the pullout test of a steel bar of a massive concrete, following the standard model of RILEM-CEB-FIP (1973) known as Pull Out Test (Steel Reinforced Bond Test) were used conventional concrete, self compacting concrete and self compacting concrete with the addition of 1% steel fibers and steel bars used were 10mm and 16mm od diameter. The analyses were based on curves that describe the behavior of the loss of adhesion between the concrete and steel, the tension of pullout of the steel rod and the characteristics presented by the massive concrete during and at the end of the research. The self compacting concrete had a gain of lead capacity in the loss of adhesion compared to conventional concrete, and the addition of steel fibers in this concrete promoted a significant increase in the load required to pull the steel bar of the massive concrete, and this had less damage essay, compared to other specimens of concrete.