Combined effect of silica fume and steel fiber on the mechanical properties of high strength concretes

Köksal, Fuat; Altun, Fatih; Yiğit, İlhami; Şahin, Yuşa

doi:10.1016/j.conbuildmat.2007.04.017

Cited by 295 publications

(148 citation statements)

References 5 publications

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“…Addition of silica fume led to higher brittleness despite increasing the N1 value. These results are in agreement with the results of other researchers [7,23]. By introducing 0.5% and 1% fiber to the silica fume specimens (Nos.…”

Section: Impact Testsupporting

confidence: 83%

“…However, high strength concrete is more brittle than normal concrete and for this reason, utilization of high strength concrete is seriously limited [3e6]. Additionally, it is well understood that silica fume, due to high pozzolanic activity, is a necessary material when producing high strength concrete; however, it also causes the concrete to have a more brittle structure [7]. Therefore, ductility improvement is an important goal in concrete science and must be taken into account by researchers.…”

Section: Introductionmentioning

confidence: 99%

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Combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete

Nili

Afroughsabet

2010

International Journal of Impact Engineering

291

108

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a b s t r a c tThis study investigated the impact resistance and mechanical properties of steel fiber-reinforced concrete with waterecement ratios of 0.46 and 0.36, with and without the addition of silica fume. Hooked steel fibers with 60-mm length and an aspect ratio of 80, with three volume fractions of 0%, 0.5%, and 1% were used as the reinforcing material. In pre-determined mixtures, silica fume is used as a cement replacement material at 8% weight of cement. The experimental results show that incorporation steel fibers improve the strength performance of concrete, particularly the splitting tensile and the flexural strengths. A remarkable improvement was observed in impact resistance of the fibrous concretes, as compared with the reference materials. The results demonstrate that when steel fiber is introduced into the specimens including silica fume, the impact resistance and the ductility of the resulting concrete are considerably increased.

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Section: Impact Testsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete

Nili

Afroughsabet

2010

International Journal of Impact Engineering

291

108

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“…For HSSFRC mixes with l/d ratio of 60 and 75, the maximum increase in compressive strength is 21.05 and 24.50%, respectively, obtained at fiber volume fraction of 2.0% compared to plain HSC. The increase in compressive strength of fiber reinforced concrete was observed also by other researchers 5,24,25 . In general, cracking of the concrete begins to take place before reaching the ultimate load as can be observed by the decrease in the slope of the ascending part of the stress-strain curve.…”

Section: Discussion Of Resultssupporting

confidence: 65%

“…High strength concrete is a brittle material and brittleness can be reduced by the addition of short discrete fibers randomly distributed in concrete. The mechanical behavior such as compressive strength, tensile strength, flexural strength, impact strength [3][4][5][6] , ductility and flexural toughness of high strength steel fiber reinforced concrete (HSSFRC) is governed by the size, type, fiber volume fraction (V f ), aspect ratio of fibers: l/d ratio (length/diameter ratio), and bond between fibers and the cementitious matrix [3][4][5]7 . The short discrete fibers delay the propagation of microcracks, due to the fact that, fibers bridge these cracks and restrain their widening, thus improve the post-peak ductility and energy absorption capacity [8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Compression specific toughness of normal strength steel fiber reinforced concrete (NSSFRC) and high strength steel fiber reinforced concrete (HSSFRC)

2011

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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, and the water-cementitious ratio (w/c+s) for the high strength fiber reinforced concrete mixes (HSSFRC) was 0.31. For each mix, three test cylinders were tested for compression specific toughness. The effect of fiber reinforcement index: volume of fibers × length/diameter ratio on compression specific toughness and also on the relationship between these two properties is presented in this paper. As a result, (a) equations are proposed to quantify the effect of fibers on compression toughness ratio of concrete in terms of FRI, (b) equations obtained in terms of FRI and compression specific toughness of plain concrete to estimate both compression specific toughness of NSSFRC and HSSFRC (N.m), (c) equations obtained which represent the relationship between compression toughness index and FRI for NSSFRC and HSSFRC, respectively, and (d) equations obtained to quantify the relationship between compression specific toughness index and fiber reinforcement index for NSSFRC and HSSFRC, respectively. The proposed equations give good correlation with the experimental values.

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“…The cracks in concrete generally occur over time due to a number of reasons. Cracks weaken the waterproofing capabilities and expose the microstructure to moisture, bromine, chloride and sulphates (Köksal et al 2008;Song et al 2005;Sivakumar and Santhanam 2007;Toutanji 1999). Thus, improving concrete properties is an important aim in concrete science (Nili and Afroughsabet 2012).…”

Section: Introductionmentioning

confidence: 99%

Effect of Fiber Hybridization on Durability Related Properties of Ultra-High Performance Concrete

Smarzewski

Barnat-Hunek

2017

Int J Concr Struct Mater

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The purpose of the paper is to determine the influence of two widely used steel fibers and polypropylene fibers on the sulphate crystallization resistance, freeze-thaw resistance and surface wettability of ultra-high performance concrete (UHPC). Tests were carried out on cubes and cylinders of plain UHPC and fiber reinforced UHPC with varying contents ranging from 0.25 to 1% steel fibers and/or polypropylene fibers. Extensive data from the salt resistance test, frost resistance test, dynamic modulus of elasticity test before and after freezing-thawing, as well as the contact angle test were recorded and analyzed. Fiber hybridization relatively increased the resistance to salt crystallization and freeze-thaw resistance of UHPC in comparison with a single type of fiber in UHPC at the same fiber volume fraction. The experimental results indicate that hybrid fibers can significantly improve the adhesion properties and reduce the wettability of the UHPC surface.

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Combined effect of silica fume and steel fiber on the mechanical properties of high strength concretes

Cited by 295 publications

References 5 publications

Combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete

Combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete

Compression specific toughness of normal strength steel fiber reinforced concrete (NSSFRC) and high strength steel fiber reinforced concrete (HSSFRC)

Effect of Fiber Hybridization on Durability Related Properties of Ultra-High Performance Concrete

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