Habitually, bio heating oil – BHO – is valorised to generate energy as fuel for boilers. This matter is a by-product derived from biodiesel production containing mainly volatile elements. These compounds could be beneficial to recover the lighter fractions of aged bitumen of RAP – reclaimed asphalt pavement – to be added in high-rate incorporation in new asphalt mixtures. Although RAP has excellent potential to be reused in pavement construction and rehabilitation actions, the available data for Europe shows that there is a need for additional efforts to achieve higher levels of RAP reuse.

    This paper presents results from the project CoolAsphalt, which aims to develop low-cost asphalt concrete on an industrial scale with up to 100% of RAP reuse, meeting appropriate requirements for medium / low-traffic roads. This 30-month ongoing project was funded by the European Union and the Portugal 2020 programme. It involved the study of different hot and warm asphalt blends in the laboratory in terms of empirical, mechanical, and functional properties. Since most of the binder within the blends suffered ageing due to solar radiation and climate exposure, the effect of secondary long-term ageing on mechanical and functional properties was assessed on asphalt mixtures specimens moulded with a high proportion of RAP and BHO as a rejuvenator.

    The laboratory results revealed that BHO effectively contributed to recovering the aged binder’s properties, considering the results obtained for water sensitivity, rutting resistance, stiffness, and fatigue cracking resistance. Even though practically no gradation adjustment was performed for the resulting asphalt mixtures, the surface and mechanical properties of the asphalt mixtures were suitable. Moreover, the production, laydown and compaction on an industrial scale to build the necessary pavement prototypes allow us to propose some relevant recommendations for using this type of mixture.


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    Title :

    Rejuvenation of High-Content Reclaimed Asphalt Mixtures with Bio-Heating Oil: Laboratory and Plant-Produced Experience


    Additional title:

    Lect.Notes Mobility



    Conference:

    Transport Research Arena Conference ; 2024 ; Dublin, Ireland April 15, 2024 - April 18, 2024



    Publication date :

    2025-07-19


    Size :

    7 pages





    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English





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