An answer to the call for environmentally friendly technologies
Nigeria, Africa’s largest economy, attaches increasing importance to the use of environmentally friendly technologies in the expansion of its infrastructure. From the beginning, the environmentally friendly cold recycling method was considered as an alternative to conventional road construction methods. The proposed use of this method was one of the factors that led to JBN winning the contract. The completion of the reconstruction project is scheduled for Q2/2023, and the completion deadline for special structures is set for early May 2024. Despite the tight schedule, JBN is optimistic that the project can be realised as planned, thanks to the time saved by the cold in-plant recycling method.
Cold recycling with foamed bitumen – an innovation in the Nigerian road construction sector
Depending on the application, the cold recycling process involves mixing foamed bitumen into the existing construction materials ‘in-place’, namely with an in situ cold recycler, or ‘in-plant’, with a mobile cold recycling mixing plant located close to the construction site. In the case of this mammoth project with a travelling construction site, the contractor decided that the ‘in-plant’ method would be the best option. The newly produced bituminous mix is known as BSM (bitumen-stabilised material). After paving and subsequent compaction, BSM is characterised by long-term durability and high load bearing properties. Viewed from a long-term perspective, BSM has other advantages: the foamed bitumen which is mixed in leads to selective adhesion within the cold recycling layer and thus prevents cracking. As part of the pavement structure, the permanent layers prepared in this way form an ideal foundation for final asphalt surfacing with considerably reduced layer thicknesses or fewer layers.
Julius Berger has adopted this construction method as the best long-term solution and sees it as a real innovation in the Nigerian road construction sector: ‘Cold recycling enables optimal use of existing construction materials and conserves valuable resources. This is why we are the first construction company in Nigeria committed to exploiting the full potential of this technology for our company and our clients’, explains Project Director Benjamin Bott.