Långtidseffekter av biobindemedel i asfalt

• The road network is an essential and integrated part of the transport infrastructure in today’s society. Nowadays, most roads are paved with asphalt mixtures. The petroleum-based bitumen is used as a binder to hold the asphalt mixture together. As a petroleum-derived product, bitumen has a relatively high environmental impact and carbon footprint. For a green transition, the use of bio-based materials from renewable resources, such as plant-based biomass, in asphalt mixtures has been investigated as a potential next-generation solution. Despite some promising results so far, knowledge gaps still exist in understanding the fundamental material behaviours and properties of the new bituminous binders and asphalt mixtures containing bio-based components. This is mainly because the bio-based components have different chemical compositions compared to bitumen and they may affect the binder behaviour and mixture performance in a different way, particularly the long-term performance. This study will investigate a specific type of bio-based material – a plant-based bio-oil – for its use in bituminous binders and asphalt mixtures as a partial replacement of petroleum-based bitumen. The study will focus on a specific and significant knowledge gap, namely the understanding of how the presence of bio-oil affects the ageing behaviour of bituminous binders and asphalt mixtures. Ageing is an important aspect to consider when evaluating the long-term performance of asphalt materials, which undergo ageing due to various factors, including exposure to sunlight, air, temperature fluctuations, etc. This ageing process can significantly affect the mechanical properties of pavement materials and thus the durability of roads. This contribution will present an experimental investigation into the ageing behaviour of bio-extended bituminous binders and asphalt mixtures, aiming to enhance our understanding of their long-term performance and durability.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Infrastrukturteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Infrastructure Engineering (hsv//eng)

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