The effect of different fibres on the flexural behaviour of concrete exposed to normal and elevated temperatures

Choumanidis, D.; Badogiannis, Efstratios; Nomikos, Pavlos; Sofianos, A.I.

doi:10.1016/j.conbuildmat.2016.10.089

Cited by 72 publications

(42 citation statements)

References 20 publications

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“…Coconut fibres can either be treated or untreated. It can be treated either by soaking the fibres in hot water or in chemical solutions [20][21][22][23]. Mulinari et al [24] stated that treated natural fibres, when it is incorporated into concrete by the compression moulding method with a 10% fibre weight, results in the concrete having a very high tensile strength when compared with composites that have untreated fibres incorporated in it using tensile and fatigue tests.…”

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confidence: 99%

Compressive Behaviour of Coconut Fibre (Cocos nucifera) Reinforced Concrete at Elevated Temperatures

Bamigboye

Ngene

Aladesuru

et al. 2020

Fibers

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Fire outbreaks in buildings have been a major concern in the world today. The integrity of concrete is usually questioned due to the fact that after these fire outbreaks the strength of the concrete is reduced considerably. Various methods have been adopted to improve the fire resistance property of concrete. This study focused on the use of coconut fibre to achieve this feat. In this study, varying percentages of treated and untreated coconut fibres were incorporated into concrete and the compressive strength was tested for both before heating and after heating. The percentages of replacement were 0.25, 0.5, 0.75 and 1% fibre content by weight of cement. Concrete cubes that had 0% fibre served as control specimens. After subjecting these concrete cubes to 250 °C and 150 °C for a period of 2 h, the compressive strength increased when compared to the control. The compressive strength increased up to 0.5% replacement by 3.88%. Beyond 0.5% fibre, the compressive strength reduced. Concrete having coconut fibre that had been treated with water also exhibited the highest compressive strength of 28.71 N/mm². It is concluded that coconut fibres are a great material in improving the strength of concrete, even after it was exposed to a certain degree of elevated temperature.

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confidence: 99%

Compressive Behaviour of Coconut Fibre (Cocos nucifera) Reinforced Concrete at Elevated Temperatures

Bamigboye

Ngene

Aladesuru

et al. 2020

Fibers

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“…Pilya et al reported a compressive strength loss of 33% at the steel fiber length of 8 mm when temperature was increased from 20°C to 300°C. Similarly, Choumanidis et al reported that the loss in compressive strength of concrete containing 1 vol% steel fiber was 28.6% when temperature was increased from 20°C to 280°C. The higher residual compressive strength of above lightweight concretes containing SF at elevated temperatures up to 450°C with increasing SF fineness can be interpreted as the formation of increasing amount of new calcium‐silicate‐hydrate (CSH) and reduction of calcium hydroxide (CH).…”

Section: Resultsmentioning

confidence: 90%

“…It can be seen that the loss in residual compressive strength are similar with the increase of the fiber aspect ratio when SF fineness is increased. Pilya et al 40 reported a compressive strength loss of 33% at the steel fiber length of 8 mm when temperature was increased from 20 C to 300 C. Similarly, Choumanidis et al 41 reported that the loss in compressive strength of concrete containing 1 vol% steel fiber was 28.6% when temperature was increased from 20 C to 280 C. The higher residual compressive strength of above lightweight concretes containing SF at elevated temperatures up to 450 C with increasing SF fineness can be interpreted as the formation of increasing amount of new calcium-silicate-hydrate (C S H) and reduction of calcium hydroxide (CH). It is reported that dehydration of CH occurs between 400 C and 500 C 42,43 and that of C S H occurs initially between 105 C and 300 C and majority of dehydration occurs between 650 C and 800 C. 44 In another study it is also reported that C S H decomposition starts at 560 C and becomes significant above 600 C. 45 As the concrete samples were heated up to 450 C in this study the increase in residual compressive strength of lightweight concretes containing SF with higher fineness is due to less CH available in those concretes, therefore, less damage of cement matrix associated with the decomposition of CH.…”

Section: Compressive Strength Of Concretes Subject To Elevated Tempmentioning

confidence: 93%

Effects of silica fume fineness on mechanical properties of steel fiber reinforced lightweight concretes subjected to ambient and elevated temperatures exposure

Arel

Shaikh

2018

Structural Concrete

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This paper presents the effects of silica fume (SF) fineness and fiber aspect ratios of steel fiber on fresh and harden characteristics of high‐strength lightweight concrete containing oil palm shell as coarse aggregates. The effect of elevated temperatures on the residual compressive strength of above concretes is also evaluated in this study. Three different SF fineness of 18 400, 21 000, and 28 000 m2/kg and 2 different aspect ratios of steel fiber of 40 and 80 are considered. Results show that the increase in SF fineness and steel fiber aspect ratio marginally affect the air‐dry density of steel fiber reinforced lightweight high‐strength concretes, however, the workability is reduced by about 9% to 14% due to increase in SF fineness. The compressive strength of steel fiber reinforced lightweight concretes at all age increases with increase in SF fineness and an improvement of about 37% is observed at 56 days by increasing the SF fineness from 18 400 to 28 000 m2/kg. Strong correlations are also observed between the strength improvement factor and the SF fineness. Water absorption of above concretes is also reduced by 3% to 14% due to increase of SF fineness from 18 400 to 21 000 and 28 000 m2/kg. The increase of SF fineness also significantly reduces the residual compressive strength loss at 300°C and 450°C. This loss of residual compressive strength is lower in lightweight concretes containing 16 mm long steel fiber than 8 mm long steel fiber. The existing Eurocode model overestimates the residual compressive strength of steel fiber reinforced lightweight concretes containing no SF, however, this discrepancy is significantly reduced with increase in SF fineness.

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“…Recently, many researchers have studied the flexural behaviour of fiber reinforced concrete (FRC) with enhanced flexural strength and toughness (Khan and Ali 2016. The incorporation of fibers has low effect on first cracking properties, but mainly improves the post cracking behaviour of concrete (Yoo et al 2013, Wu et al 2016and Choumanidis et al 2016). Furthermore, many fiber factors, i.e.…”

Section: Introductionmentioning

confidence: 99%

Influence of CaCO3 whiskers, steel fibers and basalt fibers hybridization on flexural toughness of concrete

Khan¹,

Cao²,

Ali³

2019

Sustainable Construction Materials and Technologies (SCMT)

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Nowadays, hybrid fiber reinforced concrete is developed with the combination of CaCO3 whiskers, steel and basalt fibers due to their enhanced mechanical properties of structural applications. In this study, the effect of different basalt fiber contents on flexural strength of hybrid fiber reinforced concrete (HyFRC) is investigated. In addition to this, the energy absorbed (E), toughness indices (TI) up to specified point and residual strength factor (RSF) are also calculated according to the ASTM C1018. The steel fibers and CaCO3 whiskers having contents of 5% each, by cement mass, are added. To prepare HyFRC, HyFRC1, HyFRC2, and HyFRC3, different basalt fiber content of 0%, 2.5%, 5% and 7.5%, respectively, are added. The increment in flexural strength of HyFRC up to 16% is observed. Future recommendations are to optimize basalt fiber length and content for mechanical properties of HyFRC.

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The effect of different fibres on the flexural behaviour of concrete exposed to normal and elevated temperatures

Cited by 72 publications

References 20 publications

Compressive Behaviour of Coconut Fibre (Cocos nucifera) Reinforced Concrete at Elevated Temperatures

Compressive Behaviour of Coconut Fibre (Cocos nucifera) Reinforced Concrete at Elevated Temperatures

Effects of silica fume fineness on mechanical properties of steel fiber reinforced lightweight concretes subjected to ambient and elevated temperatures exposure

Influence of CaCO3 whiskers, steel fibers and basalt fibers hybridization on flexural toughness of concrete

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