Bonding Mechanisms and Strength of Steel Fiber–Reinforced Cementitious Composites: Overview

Abdallah, Sadoon; Fan, Mizi; Rees, D. Andrew S.

doi:10.1061/(asce)mt.1943-5533.0002154

Cited by 113 publications

(36 citation statements)

References 73 publications

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“…When comparing the two investigated UHPFRCs mechanical properties, the various strength data (compression, tension, flexure) of the 120/3.5 mixture are approximately 10 to 15 % lower than those of the 160/3 mixture, which is mainly attributed to the higher w/cm [3], a lower cementitious materials content, and a resulting less dense fiber/paste interface [4]. In addition, more variation was found in the test results for the 120/3.5, as revealed by the tensile strength test results range and standard deviation data.…”

Section: Discussionmentioning

confidence: 93%

“…This is due to the electrical conductivity of the metal fibers and to the presence of fiber/paste interfaces in the fiberreinforced mixtures [9,10]. This interface is known to have a higher permeability than that of the cement paste [4]. The 28-day permeability of the 120/3.5 mixture is observed to be quite high, but the UHPFRC matrix kept densifying over time as a result of continued hydration, and after one year, the RCTP of the mixture decreased to a much lower value, in the order of 700 coulombs.…”

Section: Discussionmentioning

confidence: 99%

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UHPFRC for concrete repair

Maltais¹,

Petrov²,

Thibault

et al. 2018

MATEC Web Conf.

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As part of the St. Lawrence Seaway lock maintenance, the current practice is to perform concrete repairs entirely with reinforced concrete, using either ordinary concrete or high performance concrete (HPC) mixtures. However, with the recent advances in the field of ultra-high performance fiber-reinforced concrete (UHPFRC), the use of this new material is considered in view of improving the overall performance of repairs. The goal is to implement repairs capable of dissipating a lot of energy before breaking when a ship hits a concrete lock wall. Numerous rehabilitation materials and methods have been experimented in the past. They all were unsuccessful due to inadequate shear and impact strength characteristics of the repair materials used. These needs can be efficiently fulfilled with UHPFRC, with their superior mechanical properties and very high energy-dissipation ability. To analyze the in-situ behavior of UHPFRC, two main mixture designs were investigated: a 160-MPa mixture containing 3% of steel fibers and a 120-MPa mixture containing 3.5% of a steel fiber blend. Thick repairs with average depths of 700 mm were carried out during the winter shut down period, in very harsh climatic conditions (-12 °C, gusty wind). The performance exhibited by the repairs after a full year shows that UHPFRCs can withstand very effectively the impacts from the transiting vessels

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

UHPFRC for concrete repair

Maltais¹,

Petrov²,

Thibault

et al. 2018

MATEC Web Conf.

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show abstract

“…On the other hand, if the bond is too strong, fibre cracking occurs. Then, no post-cracking behaviour is ensured [ 7 ]. Thus, an early rupture of the fibre at low fibre displacements have to be avoided [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fibre Material and Fibre Roughness on the Pullout Behaviour of Metallic Micro Fibres Embedded in UHPC

et al. 2020

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The use of micro fibres in Ultra-High-Performance Concrete (UHPC) as reinforcement increases tensile strength and especially improves the post-cracking behaviour. Without using fibres, the dense structure of the concrete matrix results in a brittle failure upon loading. To counteract this behaviour by fibre reinforcement, an optimal bond between fibre and cementitious matrix is essential. For the composite properties not only the initial surfaces of the materials are important, but also the bonding characteristics at the interfacial transition zone (ITZ), which changes upon the joining of both materials. These changes are mainly induced by the bond of cementitious phases on the fibre. In the present work, three fibre types were used: steel fibres with brass coating, stainless-steel fibres as well as nickel-titanium shape memory alloys (SMA). SMA fibres have the ability of “remembering” an imprinted shape (referred to as shape memory effect), triggered by thermal activation or stress, principally providing for superior performance of the fibre-reinforced UHPC. However, previous studies have shown that NiTi-fibres have a much lower bond strength to the concrete matrix than steel fibres, eventually leading to a deterioration of the mechanical properties of the composite. Accordingly, the bond between both materials has to be improved. A possible strategy is to roughen the fibre surfaces to varying degrees by laser treatment. As a result, it can be shown that laser treated fibres are characterised by improved bonding behaviour. In order to determine the bond strength of straight, smooth fibres of different metal alloy compositions, the present study characterized multiple fibres in series with a Compact-Tension-Shear (CTS) device. For critical evaluation, results obtained by these tests are compared with the results of conventional testing procedures, i.e., bending tests employing concrete prisms with fibre reinforcements. The bond behaviour is compared with the results of the flexural strength of prisms (4 × 4 × 16 cm3) with fibre reinforcements.

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“…To protect civilian lives from possible terrorist attacks, civil infrastructure should provide resistance to extreme loads such as impact and blasts. Ordinary concrete, which is one of the most widely used construction materials, is well-known to be weak under such extreme loadings because of its poor energy absorption capacity and brittle nature [4][5][6]. The addition of fibers is one of the most effective methods to overcome this defect [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Blast-Resistant Performance of Hybrid Fiber-Reinforced Concrete (HFRC) Panels Subjected to Contact Detonation

et al. 2019

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This paper experimentally investigates the blast-resistant characteristics of hybrid fiber-reinforced concrete (HFRC) panels by contact detonation tests. The control specimen of plain concrete, polypropylene (PP), polyvinyl alcohol (PVA) and steel fiber-reinforced concrete were prepared and tested for characterization in contrast with PP-Steel HFRC and PVA-Steel HFRC. The sequent contact detonation tests were conducted with panel damage recorded and measured. Damaged HFRC panels were further comparatively analyzed whereby the blast-resistance performance was quantitively assessed via damage coefficient and blast-resistant coefficient. For both PP-Steel and PVA-Steel HFRC, the best blast-resistant performance was achieved at around 1.5% steel + 0.5% PP-fiber hybrid. Finally, the fiber-hybrid effect index was introduced to evaluate the hybrid effect on the explosion-resistance performance of HFRC panels. It revealed that neither PP-fiber or PVA-fiber provide positive hybrid effect on blast-resistant improvement of HFRC panels.

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Bonding Mechanisms and Strength of Steel Fiber–Reinforced Cementitious Composites: Overview

Cited by 113 publications

References 73 publications

UHPFRC for concrete repair

UHPFRC for concrete repair

Effect of Fibre Material and Fibre Roughness on the Pullout Behaviour of Metallic Micro Fibres Embedded in UHPC

Blast-Resistant Performance of Hybrid Fiber-Reinforced Concrete (HFRC) Panels Subjected to Contact Detonation

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