WMA Overlay Optimization Based on the LTPP Database: Using the RSM Method

This study investigates the field performance of Warm Mix Asphalt (WMA) road overlays containing various amounts RAP and binder. Rutting, International Roughness Index (IRI), transverse, longitudinal alligator cracking are key parameters considered here. Our research is based on a Specific Pavement Study-10 experiment (SPS-10) conducted in nine states North America (eight USA one Canada) that included 31 sections dry wet regions. Road were evaluated 1 4 years after their placement terms anti-cracking behavior compared with pre-treatment status road. The best rutting resistance occurred at 15% 12% regions, respectively. For IRI, 30% 0.0% for regions as well. maximum crack recovery rates found site 3 (BA01, Arizona; region) 26 (AA65, Missouri; region), contents 20% 36%, In addition, did not occur post-overlay, so optimal binder cannot be suggested. greatest improvements 15 (AA01, Washington state; dry) 30 (AA63, Oklahoma; wet). response surface method (RSM) was also developed to explore models selection minimize rutting, transverse lengths.