Asphalt pavement, which is relatively easy to burn in comparison to cement concrete pavement, is not often used in road tunnel. By adding flame retardant (FR) additives, asphalt pavement would be made less flammable. In this paper, the effect of three different combinations of flame retardant additives on an asphalt binder flaming was evaluated using the oxygen index test method. Additionally, the effects of additives on the asphalt binder were evaluated in terms of penetration, softening point and ductility. Recommendations for the type and contents of additives were provided based on, both, the test results and some economic considerations.
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