Abstract
Alumina trihydrate (ATH) and organic montmorillonite (MMT) were used to improve the flame retardancy and smoke suppression properties of highway tunnel asphalt mixture. A series of laboratory tests were conducted on asphalt mixtures to evaluate the effects of ATH/MMT composites on their combustion properties and road performance. Cone calorimeter test results indicate that ATH/MMT delays the ignition time of the asphalt mixture and reduce the total and peak heat release rate of asphalt mixture, thus significantly improving the flame retardancy and smoke suppression properties. The road performance test results show that ATH/MMT additionally improves the deformation resistance, moisture damage resistance, fatigue life and temperature segregation resistance of the asphalt mixture. Although the low- temperature crack resistance of the asphalt mixture is slightly reduced, it still satisfies road performance requirements.
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