Cooling Behaviour and Reusability of Hot Mix Asphalt

Temperature is the most important element that can affect the performance of hot mix asphalt. There is a large amount of discarded asphalt mixture waste after construction due to the cooling phenomenon when exposed to surroundings. This study investigates the cooling rate of the AC14 mixture and the reusability of hot mix asphalt after reheating and compacting at various temperatures. In this study, the cooling behaviour of the loose asphalt mixture was monitored by measuring the surface temperature, the internal temperature of the mixture and the surrounding conditions. The cooling curve, cooling rate, and TAC were determined based on the results obtained. Other than that, for the reusability of hot mix asphalt, five different types of samples were prepared with a different number of reheating processes and compaction temperatures. The compacted samples were tested for volumetric properties and the Marshall stability test. The result determined the surface and internal TAC at 32 and 40 min, respectively. It was also found that reheating the cold mixture twice and compacting it at a considerably high temperature could achieve the required properties. Therefore, further studies should be conducted using large-scale samples to verify the finding.