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/m3, regarded as a minimum quantity to guarantee a safe hardening behaviour for thin elements. An experimental programme on prismatic specimens has been planned to check the behaviour of concrete reinforced by micro-fibres with higher contents by volume (close to 1.2% made of high carbon steel), 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 stabilization phase, and a subsequent cooling at 25°C/h. The material has a cylindrical compressive strength of about 110 MPa. The tests confirmed the material as hardening in bending up to 400°C.

High performance steel fibre reinforced concrete: Residual behaviour at high temperature

CAVERZAN, ALESSIO;COLOMBO, MATTEO;DI PRISCO, MARCO
2009-01-01

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/m3, regarded as a minimum quantity to guarantee a safe hardening behaviour for thin elements. An experimental programme on prismatic specimens has been planned to check the behaviour of concrete reinforced by micro-fibres with higher contents by volume (close to 1.2% made of high carbon steel), 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 stabilization phase, and a subsequent cooling at 25°C/h. The material has a cylindrical compressive strength of about 110 MPa. The tests confirmed the material as hardening in bending up to 400°C.
2009
HPFRC; high temperature; high strength; residual strength; ductility; hardening; multilocalization; characteristic length
File in questo prodotto:
File Dimensione Formato  
1-1.pdf

Accesso riservato

: Altro materiale allegato
Dimensione 595.97 kB
Formato Adobe PDF
595.97 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/567582
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact