Mechanical properties of steel fibre reinforced concrete exposed at high temperatures

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Title: Mechanical properties of steel fibre reinforced concrete exposed at high temperatures

Author(s): Matteo Colombo, Marco di Prisco, Roberto Felicetti

Publication: RILEM

Volume: 43

Issue: 4

Appears on pages(s): 475-491

Keywords: Steel fibre reinforced concrete (SFRC), High temperature, Bending, Uniaxial tension, Uniaxial compression, Residual strength, Thermal Damage

Date: 4/6/2010

Abstract:
Steel fibre reinforced concrete (SFRC) is an advanced cementitious composite where fibres can act as a profitable replacement for diffused reinforcement, like welded steel mesh, especially for thin cross sections. In this case fire becomes a very important condition in the design. Previous experimental research has shown the benefits in fire resistance of steel fibres, when structural elements are bent. A careful mechanical characterization of a SFRC used for prefabrication after thermal cycles at high temperature is here presented. Three different tests are considered: four point bending, uniaxial compression and fixed-end uniaxial tension. In the paper the decay of peak and post-cracking strengths versus temperature increase for uniaxial compression, uniaxial tension and bending are discussed.


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