Abstract
This study examined the use of five commercially available recycling agents to improve the performance of asphalt mixtures, with different Reclaimed Asphalt Pavement (RAP) contents, through a balanced mix design approach to ensure sufficient resistance to cracking and rutting. These recycling agents include tall oil, aromatic extract, bio-based oil, engineered oil, and triglyceride and fatty acid oil. The results demonstrated the cracking performance of mixtures with certain recycling agents and high RAP content could be comparable to that of the virgin mixture. The use of tall oil and waste vegetable oil were found effective in improving the cracking resistance compared to other recycling agents. The results of this study clearly demonstrated the importance of implementing a balanced mix design approach to optimise the design of asphalt mixtures prepared with RAP and recycling agents.