1.1 This test method is applicable to concrete tunnel linings and passive fire protection insulations. 1.2 Concrete design mixes and tunnel linings are specific to a tunnel project. Therefore, results of the spalling test are only valid for the specific tunnel project for which the test was performed. 1.3 Passive fire protection insulations are systems that can be broadly used and are not necessarily linked to a specific tunnel project. Therefore, the results can be applied to any tunnel project. 1.4 This test method is used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Accidental fires and experimental fires in tunnels have shown that the realized temperatures (up to 2500 F) are much higher than building fires (less than 2000 F). This questions the validity of fire-proofing structural elements and barriers based on tests using fire curves derived from building fire temperatures. It is predicated that codes relating to tunnel construction will adopt the standard and the users will be the material manufacturers, design engineers, and testing laboratories.
RABT/ZTV Tunnel Curve; Rijkswaterstaat Tunnel Curve
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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