Separation and Recovery of Aggregate from Asphalt Pavement Wastes Using High-temperature and High-pressure Water

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  • Kano Yosuke
    Div. of Civil Engineering, Graduate School of Industrial Technology, Nihon University
  • Akiba Shoichi
    Div. of Civil Engineering, Graduate School of Industrial Technology, Nihon University
  • Kuriyagawa Yuzo
    Div. of Civil Engineering, Graduate School of Industrial Technology, Nihon University

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  • 高温・高圧水によるアスファルト舗装廃材からの骨材分離回収

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Abstract

The recycling ratio of reclaimed asphalt pavement (RAP) reached about 99% in 2002, the highest for any industrial waste, a clear sign that recycling efforts are actively applied in the road pavement field. Even more effective use of resources and materials will require the incorporation of environmentally-friendly processes over the entire cycle. It is also necessary to establish a pavement recycling system that can cope with the diversification of pavement materials and reclaimed materials, such as modified reclaimed materials, of which production of which is predicted to increase. This study proposes a pavement recycling technique in which high-temperature and high-pressure water is used to separate and recover aggregate and asphalt binders in RAP for reuse. The removal performance of two types of deteriorated asphalt binders was evaluated. The properties and quality of separated and recovered aggregate were also tested to examine the suitability of the recovered aggregate as pavement. The tests and analyses showed that high-temperature and high-pressure water was very effective for removing deteriorated binders and modified binders. High-temperature and high-pressure water is an environmentally friendly recycling technique with great potential and repeated reuse of recovered aggregate is feasible.<br>

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