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Flexural behaviour of ultra high-performance cementitious composites reinforced with different types of steel fibers
An experimental study was carried out in order to assess the influence of steel fibres on the flexural behaviour of an ultra high-performance cementitious composite (UHPC). Three types of micro-fibres (with a diameter ranging from 50 to 100 micrometer and a few mm in length) and two types of macro-fibres (160 micrometer in diameter, 6 or 13 mm in length) were used at fibre contents up to 8 % in volume. The flexural behaviour was assessed by recording the load-deflection curve on small beams subjected to mid-span and third-point loading tests. Test results indicate that the reinforcing mechanisms are quite different depending on the type of fibres used (i.e. a pinching effect for micro-fibres, and a crack bridging mechanism for macro-fibres). In presence of micro-fibres, the modulus of rupture is significantly increased; a linear elastic behaviour is observed up to the peak load, or nearly so, but the rupture is very brittle. In presence of macro-fibres, however, first crack occurs at a lower stress level but, multiple cracking yields a very significant increase of the peak load as well as the toughness of the material. Micro- and macro-fibres were used together to produce a UHPC having a linear elastic behaviour up to 30 MPa, a very high flexural resistance (MOR = 60 MPa) and toughness, and a close network of hairline cracks even at large deflection values.
Flexural behaviour of ultra high-performance cementitious composites reinforced with different types of steel fibers
An experimental study was carried out in order to assess the influence of steel fibres on the flexural behaviour of an ultra high-performance cementitious composite (UHPC). Three types of micro-fibres (with a diameter ranging from 50 to 100 micrometer and a few mm in length) and two types of macro-fibres (160 micrometer in diameter, 6 or 13 mm in length) were used at fibre contents up to 8 % in volume. The flexural behaviour was assessed by recording the load-deflection curve on small beams subjected to mid-span and third-point loading tests. Test results indicate that the reinforcing mechanisms are quite different depending on the type of fibres used (i.e. a pinching effect for micro-fibres, and a crack bridging mechanism for macro-fibres). In presence of micro-fibres, the modulus of rupture is significantly increased; a linear elastic behaviour is observed up to the peak load, or nearly so, but the rupture is very brittle. In presence of macro-fibres, however, first crack occurs at a lower stress level but, multiple cracking yields a very significant increase of the peak load as well as the toughness of the material. Micro- and macro-fibres were used together to produce a UHPC having a linear elastic behaviour up to 30 MPa, a very high flexural resistance (MOR = 60 MPa) and toughness, and a close network of hairline cracks even at large deflection values.
Flexural behaviour of ultra high-performance cementitious composites reinforced with different types of steel fibers
Biegeverhalten von zementartigen Ultrahochleistungs-Werkstoffen, die mit verschiedenen Stahlfasern verstärkt sind
Boulet, D. (Autor:in) / Pleau, R. (Autor:in) / Rougeau, P. (Autor:in) / Bodet, R. (Autor:in)
2000
10 Seiten, 5 Bilder, 3 Tabellen, 6 Quellen
Aufsatz (Konferenz)
Englisch
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