Properties of compacted copper fibre reinforced cement composite

Kittl, P.; Galleguillos, E.; Díaz, G.

doi:10.1016/0262-5075(85)90007-7

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…The first fundamental research work about this fibrocement was related to decohesion (1) of the copper-fibre cement interface followed by the complete fracture statistics theory of a short ductile-fibre unidirectional composite (2). That first work supplied the elements required for producing a compacted copperfibre reinforced cement composite (3) and the optimum fibre-weight and the optimum fibre-length were ascertained in this later work. The cumulative probability of fracture was determined using fracture statistics, and our theory regarding fatigue was verified thereafter (4).…”

Section: Procedimiento Experimentalmentioning

confidence: 99%

“…El primer trabajo fundamental de investigación acerca de este fibrocemento [1] tuvo relación con la decohesión en la interface fibra de cobre-cemento, seguido por la teoría estadística de fractura de un compuesto unidireccional formado por fibras cortas dúctiles [2]. El primer trabajo proporcionó los elementos necesarios para producir el compuesto fibra de cobre cemento compactado [3], así el porcentaje óptimo de fibra y su longitud óptima se obtuvieron. Usando la teoría estadística de fractura se determinó la probabilidad acumulativa de fractura, y nuestra teoría respecto de la fatiga fue verificada posteriormente [4].…”

Section: Introductionunclassified

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Compatibilidad interfacial e interna en el compuesto fibra de cobre cemento

Kittl¹,

Martínez²

1993

Mater. construcc.

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Fecha de recepción: 18-VI-93. RESUMENEste trabajo presenta el comportamiento mecánico de un compuesto fabricado por compactación y constituido por fibras de cobre distribuidas aleatoriamente en una matriz de cemento portland. Las muestras, la mitad con fibras y la otra sin ellas, se sometieron a fatiga por compresión. El ciclo de carga fue de 1 hertz y la carga aplicada aquella correspondiente a la tensión asociada a un 1% de probabilidad de fractura cuando la carga se aplica gradualmente. Para ambos tipos de muestras se graficaron los diagramas de probabilidad acumulativa de fractura en función del número de ciclos. Con microscopía electrónica de barrido se observó que el mecanismo de fractura es diferente para cada tipo de muestras. Aquellas de pasta pura de cemento compactada terminaron su ciclo de vida en forma catastrófica, mientras que aquellas con fibra presentaron un comportamiento seudodúctil sin falla catastrófica. Se discuten los resultados y se comparan con otros obtenidos por choque ténnico y con la teoría de fragilidad interfacial, así como con la teoría estadística del tiempo de fractura para materiales base cemento sometidos a carga cíclica. En el caso del choque térmico las microfisuras se generan en la interface matriz-fibra las que actúan simultáneamente como emisoras y bloqueadoras de grietas, mientras que esto no ocurre en el caso de fatiga mecánica.

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Section: Procedimiento Experimentalmentioning

confidence: 99%

Section: Introductionunclassified

Compatibilidad interfacial e interna en el compuesto fibra de cobre cemento

Kittl¹,

Martínez²

1993

Mater. construcc.

Self Cite

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“…Several practical studies work on materials such as gum tree powder, copper fibers, clay, fly ash, carbon fibers, polyvinyl chloride, cork, metals, rice husks, silica fume, and Portland (Abbood, 2018;Abbood et al, 2020 This work investigates the effectiveness of random copper fibers in general and for two different diameters of copper fibers in particular, with two different ratios of water to gypsum. The copper fibers' high ductility may prevent gypsum smash or breaking by preventing pullout from the mixture (Kittl et al, 1985).…”

Section: Introductionmentioning

confidence: 99%

The Evaluation Effect of Copper Fibre Diameter on Enhancing Compressive Strength of Pure Gypsum

Shubber,

Abbas,

AL-Taweel

et al. 2023

J. Ecol. Eng.

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The sustainability and impact of copper fibres on pure gypsum is the primary purpose of this study to investigate a combination of two kinds of copper fibres obtained from environmental waste (damaged electrical wires). The copper fibres are dividings into a fixed length of 10 mm, but with two different diameters: the first is 0.83 mm and the second is 0.63 mm, where the ratio of width to height (L/D) is 12 and 15.9, respectively, with a volume ratio V f = 0.4%, the ratios 0.5 and 0.6 represent the water to gypsum ratio (W/G ) individually. Each W/G ratio has two types of mixtures which organize according to diameter. The first considers a reference mixture without copper fibres (CF), and the other is a copper fibres mixture. This work found that the compressive strength increased from adding the copper fibres to a mixture of pure gypsum. Furthermore, this increase is apparent in pure gypsum compressive strength when raising the aspect ratio because of reducing the copper fibres' diameters. In another way, increasing ratio of W/G in the case of existing copper fibres or none may reduce a compressive strength of mixtures. Therefore, when the ratio of W/G drops, the significance of copper fibres may become more apparent.

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“…This is because the fibres increase the gypsum tensile strength and shape stability to support the mixture to reduce degradation and breakdown.Many researchers have studied the effect of even more substances such as steel fibre or chipped carbon fibres to reinforce a concrete mix, cement mortar, and asphalt concrete admixtures [24][25][26][27][28][29][30][31][32].The current work proposes to design Pure Gypsum (PG) of unique fibres that strengthen as a composite form by use of compact and ductile copper fibres haphazardly scattered in the gypsum. Copper fibres present high ductility [33] to improve problematic brittle material fractures to become ductile fractures and also block the tendency to pull-out from the gypsum. Therefore, this work adopts copper fibres as an additive to gypsum.…”

Section: Introductionmentioning

confidence: 99%

The influence of chopped copper fibre (CF) on the improvement of pure gypsum by compressive strength

Abbas¹,

AL-Ridha²,

Faris³

et al. 2022

J Appl Eng Science

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This study investigates the efficacy, performance, and effect of chopped Copper Fibre (CF) on a Pure Gypsum (PG) mixture. The Copper Fibre (CF) is extracted from the waste of electrical wires that are considered as environmental waste. Three models of Copper Fibre (CF) with a diameter of 0.83 (mm) and lengths of 10 (mm), 20 (mm), and 30 (mm) (Aspect-Ratio L/d = 12, 24 and 36 respectively), with Volume Fraction (V.f.) for Copper Fibre (CF) by two Water/Gypsum Ratios (W/G) worth (0.5 and 0.6) are created. The mixtures are divided into two groups of W/G ratios. Each group contains four samples, one reference without Copper Fibre (CF) and the other three with the addition of Copper Fibre (CF) individually with different lengths. The results show that adding Copper Fibre (CF) to the Pure Gypsum (PG) mixture increases the Compressive Strength. Further, the effect is to heighten the Compressive Strength of Pure Gypsum (PG) when the Aspect-Ratio is raised. In other words, when the (W/G) Ratio is reduced, the Compressive Strength increases in the presence or absence of Copper Fibre (CF). Moreover, the efficiency of the Copper Fibre (CF) develops further when the W/G ratio is decreased.

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Properties of compacted copper fibre reinforced cement composite

Cited by 12 publications

References 5 publications

Compatibilidad interfacial e interna en el compuesto fibra de cobre cemento

Compatibilidad interfacial e interna en el compuesto fibra de cobre cemento

The Evaluation Effect of Copper Fibre Diameter on Enhancing Compressive Strength of Pure Gypsum

The influence of chopped copper fibre (CF) on the improvement of pure gypsum by compressive strength

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