Steel Fibers
Mostrando 25-36 de 61 artigos, teses e dissertações.
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25. Fibras de aço em concreto de cimento Portland aplicados a pavimento / Portland cement concrete with steel fibers used in pavement
The objective of this research is to contribute for the Portland cement concrete study with addition of fibers used on pavements. This research studied the results of different dosages using steel fibers in order to optimize their use as well as direct care during mixing and application. The Portland cement concrete pavement has been acting with an important
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/2011
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26. Development and characterization of composite materials for production of composite risers by filament winding
Industry has been challenged to provide riser systems which are more cost effective and which can fill the technology gaps with respect to water depth, riser diameter and high temperatures left open by flexibles, steel catenary risers (SCRs) and hybrid risers. Composite materials present advantages over conventional steel risers because composite materials a
Materials Research. Publicado em: 26/08/2011
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27. Compression specific toughness of normal strength steel fiber reinforced concrete (NSSFRC) and high strength steel fiber reinforced concrete (HSSFRC)
Compression toughness tests were carried out on concrete cylinders reinforced with three different aspect ratios of hooked-end steel fibers 60, 75, and 83 and six different percentages of steel fibers 0.5, 1.0, 1.25, 1.5, 1.75, and 2.0% by volume of concrete. The w/c ratio used for the normal strength steel fiber reinforced concrete mixes (NSSFRC) was 0.55,
Materials Research. Publicado em: 03/06/2011
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28. Estudo da aderência entre concreto e armadura: análise da influência das fibras de aço / Study of adhesion between concrete and reinforcement: influence of steel fibers
A aderência entre a barra de aço e o concreto permite que haja a compatibilização entre os dois materiais, validando o seu uso como material de construção. Quanto melhor a aderência, menores são as aberturas das fissuras e mais protegida fica a armadura. Assim, busca-se neste trabalho investigar a influência das fibras de aço nas propriedades mecâ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2010
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29. Effect of steel fibers on plastic shrinkage cracking of normal and high strength concretes
Naturally concrete shrinks when it is subjected to a drying environment. If this shrinkage is restrained, tensile stresses develop and concrete may crack. Plastic shrinkage cracks are especially harmful on slabs. One of the methods to reduce the adverse effects of shrinkage cracking of concrete is by reinforcing concrete with short randomly distributed fiber
Materials Research. Publicado em: 2010-06
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30. Estudo da aderência entre concreto e armadura: análise da influência das fibras de aço / Study of adhesion between concrete and reinforcement: influence of steel fibers
Bond between steel bars and concrete allows the use of reinforced concrete as a construction material. If the bond is appropriate, the cracks will be as little as possible, so the reinforcing bar will be protected by the surrounded concrete. Therefore, the aim of this research was to analyse the influence of steel fiber on mechanical properties of concrete a
Publicado em: 2010
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31. Stress-strain curves for steel fiber-reinforced concrete in compression
This paper presents a study on the compressive behavior of steel fiber-reinforced concrete. In this study, an analytical model for stress-strain curve for steel fiber-reinforced concrete is derived for concretes with strengths of 40 MPa and 60 MPa at the age of 28 days. Those concretes were reinforced with steel fibers with hooked ends 35 mm long and with as
Matéria (Rio de Janeiro). Publicado em: 2010
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32. Estudo Experimental de Pavimentos de Concreto: Influência da Posição da Barra de Transferência e do Tipo de Concreto / Experimental Study of Concrete Pavement: Influence of Position of Bar Transfer and Type of Concrete
Este trabalho apresenta um estudo experimental do comportamento de juntas transversais em placas de concreto simples, apoiadas sobre uma fundação elástica. Devido às tensões provocadas pelo carregamento e por variações volumétricas das placas, as juntas transversais quando mal executadas podem ocasionar uma redução da eficiência da transferência
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/03/2009
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33. Correlating slump, slump flow, vebe and flow tests to rheological parameters of high-performance concrete
Conventional single-point workability tests continue to be used for specification and quality control of concrete despite their inherent limitations. These tests cannot characterize workability of concrete in terms of fundamental rheological parameters. Attempt has therefore been made to correlate slump, slump flow, slump flow time, percent flow and Vebe tim
Materials Research. Publicado em: 2009-03
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34. Estudo experimental de consolos de concreto com fibras moldados em etapas distintas dos pilares / Experimental research of reinforced fiber concrete corbels shaped in distinct stage to the column
The industrial production of traditional corbel presents some difficulties due to the great quantity of reinforcement in a small space. Beyond the main bars, it is generally used vertical and horizontal stirrups. This experimental study proposes a corbel shaped in the prior stage to the column, with the reinforcement and surfaces prepared to the later connec
Publicado em: 2009
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35. Avaliação do comportamento de vigas de concreto auto-adensável reforçado com fibras de aço. / Evaluation of the behavior of self-compacting concrete beams reinforced with steel fibers.
O concreto auto-adensável (CAA) vem se caracterizando como uma grande evolução na tecnologia do concreto, sendo capaz de preencher todos os espaços vazios da fôrma e adensar-se apenas pela ação de seu peso próprio. Se ao CAA adicionam-se fibras de aço, sem prejuízo de suas propriedades no estado fresco, novas vantagens e possibilidades de aplicaç�
Publicado em: 2009
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36. Experimental Study of Concrete Pavement: Influence of Position of Bar Transfer and Type of Concrete / Estudo Experimental de Pavimentos de Concreto: Influência da Posição da Barra de Transferência e do Tipo de Concreto
This work presents an experimental study of the behavior of transverse joints in unreinforced concrete slabs under elastic support. Due to the tensions caused by loads and volumetric variations in the slab, transverse joints when badly executed can cause a efficiency reduction in the shear transfer, thus reducing the useful life of the concrete pavement. To
Publicado em: 2009