NDLI: High performance steel fibre reinforced concrete: residual behaviour at high temperature

Content Provider	Springer Nature Link
Author	Caverzan, Alessio Colombo, Matteo di Prisco, Marco Rivolta, Barbara
Copyright Year	2014
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 ( $$l_{\rm f}= 30$$ mm; $$l_{\rm f}/d_{\rm f}=$$ 45) are used with reduced contents (content by volume of 0.6 %). 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 ( $$l_{\rm f}= 13$$ mm; $$l_{\rm f}/d_{\rm f}=$$ 81) in the best direction just controlling the casting flow direction properly. The fibre content selected is equal to 100 kg/m$^{3}$ (content by volume of 1.2 %), regarded as a minimum quantity to guarantee a safe hardening behaviour for thin elements in direct tension. 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. 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 600 °C). Each thermal cycle was carried out in an electric furnace, by imposing a heating rate of 50 °C/h up to the maximum temperature, a two hours of stabilization phase, and a subsequent cooling at 25 °C/h. The tests confirmed the material as hardening in bending up to 400 °C. Moreover, the behaviour of the fibres were studied testing them at the same thermal damage level.
Starting Page	3317
Ending Page	3329
Page Count	13
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	48
Issue Number	10
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-11-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	High performance fibre reinforced cementitious composites (HPFRCC) High temperature High strength Residual strength Ductility Hardening Multi-localization Structural characteristic length Structural Mechanics Materials Science Theoretical and Applied Mechanics Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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