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|Title:||High Performance Steel Fibre Reinforced Concrete: Residual Behaviour at High Temperature|
|Authors:||CAVERZAN ALESSIO; COLOMBO Matteo; DI PRISCO Marco; RIVOLTA Barbara|
|Citation:||MATERIALS AND STRUCTURES|
|Type:||Articles in periodicals and books|
|Abstract:||Steel Fibre Reinforced Concrete (SFRC) is considered as a profitable replacement for diffused reinforcement like welded steel mesh, especially for thin cross sections. In case of precast light roof elements, fire becomes a very important condition in the design. A previous experimental programme showed the benefits of steel fibre for fire resistance of bent members when macro-fibres are used with reduced contents. The interest to reduce the weight and to prevent the need of any water proofing membrane has suggested to use fibre reinforced high performance material. The material selected was also chosen self-compacting in order to be able to orient straight steel micro-fibres in the best direction just controlling the casting flow direction properly. The fibre content selected is equal to 100kg/m^3 (content by volume of 1.2%), regarded as a minimum quantity to guarantee a safe hardening behaviour for thin elements. The material has a cylindrical compressive strength of about 110 MPa. An experimental programme on prismatic specimens has been planned to investigate the behaviour of high perfomance cementitious composite reinforced by micro-fibres, when exposed to high temperatures. Moreover, the influence of fibre were studied testing the cement matrix at the same thermal damage level. A third point bending set-up was adopted. The mechanical characterization was performed after thermal cycles up to three different thermal thresholds (200, 400 and 600⁰C). Each thermal cycle was carried out in an electric furnace, by imposing a heating rate of 50⁰C/h up to the maximum temperature, a stabilization phase, and a subsequent cooling at 25⁰C/h. The tests confirmed the material as hardening in bending up to 400⁰C.|
|JRC Directorate:||Space, Security and Migration|
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