Spalling Sensitivity Test on Concrete
Concrete sensitivity to spalling in fire is still a critical issue, as no reliable predictive model is currently available. Hence, so far, experimental testing is the most effective means of investigation. This is the reason why an experimental setup has been designed (and discussed in the RILEM TC 256 SPF) by the authors, based on 800 × 800 mm concrete slabs installed in a steel frame, aimed at applying a biaxial membrane compression. Load and slab thickness can be adjusted in order to simulate the actual service conditions of concrete elements such as tunnel lining segments. The loading system is placed on a horizontal furnace powered by a propane burner fitted with an automatic control system, allowing to follow the prescribed heating curve. This setup allows comparing different concrete mixes as regards their sensitivity to spalling in realistic service conditions and can be of considerable help in initial material testing for strategic infrastructures such as tunnels.
KeywordsConcrete Fire spalling Test setup Tunnels
The Authors are grateful to CTG-Italcementi Group (Bergamo, Italy) and Fondazione Lombardi Ingegneria (Minusio, Switzerland) for the financial support given to this research project.
The tests campaign on NSC under different membrane loads was performed in cooperation with Jihad Md Miah and Pierre Pimienta (CSTB, France).
- Felicetti R, Lo Monte F, Pimienta P (2012) The influence of pore pressure on the apparent tensile strength of concrete. In: Proceedings of the 7th International Conference on Structures in Fire – SIF 2012, Zurich, Switzerland, 6–8 June, pp 589–598Google Scholar
- Lo Monte F, Miah JM, Aktar S, Negri R, Rossino C, Felicetti R (2014) Experimental study on the explosive spalling in high-performance concrete: role of aggregate and fibre types. In: Proceedings of the 8th International Conference on Structures in Fire – SIF 2014, Shanghai, China, 11–13 June, pp 1219–1226Google Scholar
- Lo Monte F, Rossino C, Felicetti R (2015) Spalling test on concrete slabs under biaxial membrane loading. In: Proceedings of the 4th International Workshop on “Concrete Spalling due to Fire Exposure”, Leipzig, Germany, 8–9 OctoberGoogle Scholar
- Pistol K, Weise F, Meng B, Schneider U (2012) The mode of action of polypropylene fibres in high performance concrete at high temperatures. In: Proceedings of the 2nd International Workshop Concrete Spalling due to Fire Exposure, Delft, the Netherlands, 5–7 October, pp 289–296Google Scholar
- Sjöström J, Lange D, Jansson R, Boström L (2012) Directional dependence of deflections and damages during fire tests of post-tensioned concrete slabs. In: Proceedings of the 7th International Conference on Structures in Fire – SIF 2012, Zurich, Switzerland, 6–8 June 2012, pp 589–598Google Scholar
- Tsimbrovska M, Kalifa P, Quenard D, Daiän, JF (1997) High performance concrete at elevated temperature: permeability and microstructure. In: Transactions of the 14th International Conference on Structural Mechanics in Reactor Technology, Lyon, France, pp 475–482Google Scholar
- Yufang F, Lianchong L (2010) Study on mechanism of thermal spalling in concrete exposed to elevated temperatures. Mater Struct 44:361–376Google Scholar