Mixture design method for warm mix asphalt with rubber powder based on porosity matching

This study examines the impact of seven different warm mix additives on the properties of rubber-modified asphalt. Through a comprehensive performance evaluation, the optimal formulation was identified as warm mix asphalt modified with nitrile rubber powder, which demonstrated excellent low- and high-temperature properties while exhibiting reduced viscosity. The performance of warm mix asphalt and hot mix asphalt was tested at various mixing temperatures utilizing porosity-compaction temperature curves. The study revealed the appropriate mixing and paving temperatures for warm mix asphalt, which were found to be 20°C lower than those of hot mix asphalt. Additionally, the warm mix asphalt’s overall performance improved, especially in terms of its low-temperature qualities, as the mixing temperature rose. This research offers both theoretical insights and practical guidance for advancing warm mix asphalt technology and optimizing pavement materials.