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  Mobile furnace for determining fire resistance of existing concrete structures

  Although for new concrete structures there are extensive fire testing methods, for existing concrete structures a reliable and cost-effective testing method for fire resistance does not exist. This means that nowadays for existing concrete structures it is unclear whether or not the structure is sensitive to concrete spalling or whether the current fire protection layer still holds in a tunnel fire. Due to the current lack of adequate prediction models for concrete spalling, fire testing is still the most reliable option. Recently Efectis developed a mobile furnace which is capable of determining the fire resistance of structures in-situ, such as concrete tunnel linings or buildings. With a mobile furnace it is possible to subject a small part of a tunnel to fire loads equal to major tunnel fires, such as the RWS, RABT or HC fire curve. This paper shows that a mobile furnace can be a valuable tool to determine the safety level of today’s infrastructure by determining the level of concrete spalling. This paper presents a typical test case on how the mobile furnace has been used in practice to assess the fire resistance of an existing concrete structure, the Maastunnel.

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