The document discusses different methods for adding recycled tire rubber to asphalt, including the traditional wet process, dry process, and Rapid Digestion Process (RDP). The RDP allows for a higher percentage of tire rubber (40-50%) to be added by blending shredded or mulched rubber into the asphalt before adding aggregate. RDP mixtures have over 98% solubility and compatibility between the rubber and asphalt. RDP provides benefits like improved cracking resistance, fatigue resistance, and compatibility with recycled asphalt materials.