| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Middendorf, Bernhard
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2025An Initial Study of Ultra High Performance Concrete as Reusable Mold Material for Aluminum Casting
- 2023Fracture behavior of ultra‐high performance lightweight concrete: In situ investigations using μ‐CTcitations
- 2023Fibre reinforced ultra-high performance concrete – Rheology, fibre bond strength and flexural strength
- 2023Potential of Fe-Mn-Al-Ni Shape Memory Alloys for Internal Prestressing of Ultra-High Performance Concretecitations
- 2023Ultra-high performance alkali-activated slag as a reusable mold for light metal casting
- 2023Atomistic Dissolution of β-C2S Cement Clinker Crystal Surface: Part 1 Molecular Dynamics (MD) Approach
- 2022Dissolution of β-C<sub>2</sub>S Cement Clinker: Part 1 Molecular Dynamics (MD) Approach for Different Crystal Facetscitations
- 2022Dissolution of Portlandite in Pure Water: Part 1 Molecular Dynamics (MD) Approachcitations
- 2022Dissolution of Portlandite in Pure Water: Part 2 Atomistic Kinetic Monte Carlo (KMC) Approachcitations
- 2022Dissolution of β-C<sub>2</sub>S Cement Clinker: Part 2 Atomistic Kinetic Monte Carlo (KMC) Upscaling Approachcitations
- 2020Effect of Fibre Material and Fibre Roughness on the Pullout Behaviour of Metallic Micro Fibres Embedded in UHPCcitations
- 2019A simulation-based approach to evaluate objective material parameters from concrete rheometer measurementscitations
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article
Effect of Fibre Material and Fibre Roughness on the Pullout Behaviour of Metallic Micro Fibres Embedded in UHPC
Abstract
<jats:p>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.</jats:p>