ADAPTABILITY OF HYDROTHERMAL DECOMPOSITION METHOD FWOR REPEATED RECYCLING OF RECLAIMED ASPHALT PAVEMENT

Abstract

 In recent years, there has been an urgent need to develop a technology for the sustainable recycling of asphalt pavement waste materials, and various studies have been conducted. The authors have focused on the solvent and decomposition performance of high-temperature, high-pressure water for organic matter, and have developed a technology for restoring the properties of degraded asphalt by hydrothermal decomposition using high-temperature, high-pressure water at 350°C. In this study, the authors confirmed the adaptability of the hydrothermal decomposition method to degraded asphalt, and confirmed that the method can be applied to both degradation and regeneration of degraded asphalt. In this study, the adaptability of the hydrothermal decomposition method to degraded asphalt that has undergone multiple cycles of degradation and regeneration was confirmed. As a result, it was found that asphalt recovered by hydrothermal decomposition showed a greater recovery in elongation and a decrease in polymer content compared to the conventional regeneration method. It was also found that asphalt mixture blended with hydrothermally degraded asphalt satisfied the quality target values of the regenerated heated asphalt mixture based on the cracking coefficient.