Concreto reforçado com fibras.

Figueiredo, Antônio Domingues de

doi:10.11606/t.3.2012.tde-18052012-112833

Cited by 48 publications

(93 citation statements)

References 1 publication

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“…For the cross section determination 10 macrofibres were randomly selected to be analyzed. This ρ value was then used to determine the cross section (S) using the length (L) and the weight (m) of each macrofibre used in the tensile test as presented in Equation (1).…”

Section: Test Methodsmentioning

confidence: 99%

“…The most important mechanical properties of fibres that are used to produce fibre reinforced concrete (FRC) are the tensile strength and the elastic modulus 1 . The first directly affects the post-cracking behaviour of the FRC.…”

Section: Introductionmentioning

confidence: 99%

“…In that sense, when the matrix cracks there is a stress transference from the matrix to the fibres. Then, the higher the fibre tensile strength is, the higher the capacity of the residual strength is 1 . The elastic modulus of the fibre is important as it gives the stiffness and the capacity to restrain the propagation of the cracks 2 .…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Characterization of Synthetic Macrofibres

2016

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The present study proposes a methodology to characterize the mechanical properties of synthetic macrofibres, which are used as a reinforcement of new composites applied in civil construction industry. Some standards suggest that this characterization should be performed on original filaments and others propose using the current methodology used to characterise metallic fibres. These recommendations turn difficult the quality control procedure, so it was developed a methodology to characterize the mechanical properties of the macrofibres as they are supplied in the construction site, using the tensile test. In that sense, two types of macrofibres were evaluated obtaining their tensile strength and elastic modulus. Additionally, the macrofibres were mixed with aggregates in order to study how the abrasion affects their mechanical properties. Summing up, the proposed methodology is feasible, especially to estimate the tensile strength allowing its application in ordinary laboratories. Regarding the elastic modulus results, they may be underestimated using this method. Finally, it was observed that the abrasion between the macrofibre and the aggregates during the mixing process compromises the mechanical properties decreasing both the tensile strength and the elastic modulus.

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Section: Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical Characterization of Synthetic Macrofibres

2016

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“…Nestas aplicações, as fibras atuam para aumentar tanto a resistência quanto a ductibilidade do material. O reforço secundário, utilizados em lajes, pavimentos e tubos de concreto para esgotos sanitários, apresentam a finalidade de controlar e reduzir a fissuração gerada [4].…”

Section: Adição De Fibras De Açounclassified

“…Atuam como reforço do concreto endurecido, podendo até substituir total ou parcialmente as telas e barras de aço usadas convencionalmente em algumas concretagens, tornando-se mais eficientes, econômicas, e de fácil e rápida aplicação quando comparadas às soluções tradicionais [4].…”

Section: Estudo Da Fibraunclassified

Fibras de aço em blocos de concreto: estudo para utilização em ambiente marítimo

Migliorini¹,

Guimarães²,

Ozório³

2012

Matéria (Rio J.)

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RESUMOEste projeto tem como propósito de estudo a possibilidade do uso de fibra para os blocos de contenção às ondas marinhas, de modo a influenciar na sua resistência e durabilidade. Levando em consideração o sucesso da utilização da fibra de aço em esgotos sanitários -um ambiente altamente corrosivo -seu uso tornou-se o mais indicado para o ambiente marítimo em questão. Tendo ciência que o concreto pode ser atacado até mesmo sem estar em contato com a água do mar -o ar deste ambiente, por si só, possui sais nocivos à pasta de cimento -foi feito um estudo baseado em um ensaio de durabilidade com blocos (contendo cloreto na massa e sem adição do mesmo) expostos às intempéries e, dentro da mesma análise, ensaio de "molhagem e secagem" utilizando solução de NaCl-para ativar na penetração dos íons cloretos, de modo a verificar a condição da fibra de aço e suas resistências por dois anos de idade.Palavras-chave: ambiente marítimo, fibras de aço, resistência e durabilidade. ABSTRACTThe present article's main objective is to study the possibility of using steel fibers in concrete to be applied under the format of blocks for the containment of marine waves, searching to influence their mechanical resistance and lifetime. Based on the success of utilizing steel fibers in concrete applied in sewage, a very corrosive environment, these fibers were also considered to be applied in the marine environment. Concrete might be attacked even without direct contact with sea water because of the high amount of chlorine contained in salts diluted in air. A study was made based on lifetime tests for two years with concrete blocks either containing or not chlorine in its constitution. The concrete blocks were exposed to atmospheric condition and also to a wet-dry testing procedure in the presence of NaCl to enhance the penetration of chlorine ions in the samples.

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Experimental method for investigating the impact of the addition of polymer fibers on drying shrinkage and cracking of concretes

Ehrenbring

Quinino

Silva

et al. 2019

Structural Concrete

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This study presents an investigation of a fiber‐reinforced concrete (FRC) with use of fibers of polypropylene, polyvinyl alcohol, and recycled polyester in the amount of 0.50%, seeking to analyze the impact of the fiber additions on mechanical properties, drying shrinkage, and cracking. Regarding flexural strength, a reduction of up to 25% of the value was observed for FRC. The residual strength of FRCs was increased values 20 times higher than the reference concrete. The addition of fibers also increased the void content of the matrices and, therefore, drying shrinkage of the reference matrix up to 74%. The fiber additions increased the internal tensile stresses of the FRC of up to 12.0 MPa. Besides the increase in resistance, the FRC presented formation cracks with openings 8 times smaller than the concrete.

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Concreto reforçado com fibras.

Cited by 48 publications

References 1 publication

Mechanical Characterization of Synthetic Macrofibres

Mechanical Characterization of Synthetic Macrofibres

Fibras de aço em blocos de concreto: estudo para utilização em ambiente marítimo

Experimental method for investigating the impact of the addition of polymer fibers on drying shrinkage and cracking of concretes

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