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2020 / 2021 Edition

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Paving the way to highway resilience

Tarmac

Tarmac and Shell trial new AgeSafe bitumen designed extend the life of the UK’s roads

LOCAL roads are the lifeblood of the UK’s economy and on their own represent an asset worth over £400 billion – and yet the socio-economic importance of having a high-quality, well-maintained local road network is often underestimated.

Faced with years of funding restrictions, councils have favoured ‘patch and mend’ solutions that do not provide the lasting repair that is needed to maintain the safety and integrity of local roads.

Highways that are affected by potholes are often a symptom of an underlying structural problem which cannot be ‘fixed’ by filling in the hole – which acts as little more than wallpaper over a systemic crack.

Increasingly, highways authorities are looking for new solutions that are not only more durable and require fewer repairs, but that can also provide cost savings and environmental benefits from reducing the carbon emissions associated with maintenance work.

Working in partnership with Shell, Tarmac were recently involved in a trial of a new type of bitumen called AgeSafe. Specially designed to resist ageing due to oxidation, which is the key factor leading to the hardening of bitumen that ultimately leads to pavement failure, AgeSafe is said to be ideal for all types of roads, but particularly relevant where public disruption or high intervention costs are a primary consideration.

More than 200 tonnes of material containing the innovative bitumen were recently laid on a section of road in Northamptonshire. The performance of the new surface is being carefully monitored and data from the trial are set to reveal what can be achieved in terms of extending the lifetime of an asphalt pavement.

Brian Kent, national technical director at Tarmac, discussed the company’s role in the project and its potential benefits for the UK’s roads on the award-winning Engineering Matters podcast – the podcast all about engineers and the problems they have to solve to help improve the world.

Produced in association with Shell Bitumen, the full episode is available on all major podcast platforms and can be accessed online here.

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