1.1This test method is applicable to the fire resistance of concrete tunnel linings. 1.2Concrete design mixes, tunnel linings and fire protection methods are specific to each tunnel project. Therefore results of the spalling test are only valid for the specific materials and systems employed during each test, notwithstanding maximum and minimum limitations. 1.3Tunnels are potentially exposed to ground water, even those passing through elevated terrain such as mountains. Consideration shall be given to potential adverse effects that result such as material degradation due to the moister exposure. 1.4Movement joints shall be considered and their impact on the overall fire resistance shall be assessed by testing. Tests shall be conducted as a system. 1.5The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.6This test method does not address mechanical attachment methods for equipment due to the vast variety of possible methods and loads. However, consideration shall be given to methods that appreciably affect the concrete temperature during the heating conditions. Consideration shall be given to a second test conducted with the attachment to evaluate the effect. The attachment test shall include the largest diameter anchor, the deepest installed anchor, and the largest load. This requirement results in a single anchor being tested or multiple anchors being tested. If multiple anchors are required to be tested, then each shall be tested under its maximum load. 1.7This standard 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. 1.8Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests. 1.9This 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.
KeywordsRABT/ZTV Tunnel Curve; Rijkswaterstaat Tunnel Curve
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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