Abstract
In Japan, asphalt pavement waste is recycled about 99%, of which about 60% is utilized as a hot recycled mixture. However, conventional technology does not guarantee the quality of repeatedly recycled pavement. In the future, it is essential to establish sustainable recycling technology for asphalt pavement waste. Based on above, the authors are working on developing reconstruction technology that can separate aggregate and aged binder in waste materials and restore the separated material to its original state. We confirmed that aggregate separated and recycled by the hot water rubbing method can be maintained and used in the same way as with virgin aggregate, in previous study. This study attempted to recycle asphalt using water with a focus on solvent characteristics of high-temperature and high-pressure water. As a result, hydrothermal decomposition technology utilizing high-temperature and high-pressure water reduced the molecular weight and oxidation degree in aged binder and confirmed to re-refined to near chemical properties and physical properties of virgin asphalt.
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References
Kano Y, Akiba S, Akatsu K (2016) A basic study the separation recycling technology of reclaimed asphalt pavement. J Jpn Soc Civil Eng 72(3):I_61–I_68
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Akatsu, K., Kanou, Y., Akiba, S. (2020). Experimental Study to Re-refine Aged Binder Using Water. In: Pasetto, M., Partl, M., Tebaldi, G. (eds) Proceedings of the 5th International Symposium on Asphalt Pavements & Environment (APE). ISAP APE 2019. Lecture Notes in Civil Engineering, vol 48. Springer, Cham. https://doi.org/10.1007/978-3-030-29779-4_30
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DOI: https://doi.org/10.1007/978-3-030-29779-4_30
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