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News from the UK Civils Industry October 2019

Posted by: Melonie Debenham
Industry News

Recycled asphalt used for highway surfacing

Asphalt using 50 percent recycled content has been used on a section of highway surfacing the M25, which is thought to be the highest level of recycled content ever used on the strategic road network (SRN).

This comes off the back of news last month that Highways England is trialing a new road surface on the M1 using recycled tyres.

The surface course contained 50% high polished stone value recycled aggregate. A total of 260 tonnes of surfacing material was laid on the inside lane of the M25 between Junctions 25 and 26 to a depth of 45mm, during an overnight closure.

The surfacing material was made by mixing reclaimed asphalt pavement (RAP) with virgin aggregate to improve the durability of the surface course by raising the resistance to rutting and cracking.

Infrastructure company FM Conway took 24 core samples before planning on the sites and tested them in its laboratory to ensure the material would be suitable.

Mark Flint, technical manager at FM Conway, said: “Extensive core sampling and testing was imperative as we were looking for the correct grade of aggregate as well as the right polished stone value. Being able to carry out the research and development at our Technology Centre and engineer a bespoke PMB at our PMB plant was beneficial to the success of the mix.

“Quarries and bitumen won’t last forever, but there is a quarry out there – in the form of existing roads – that we can tap into and use. We can stop importing so much material and bring it from only a few miles away.”

Permission for a departure from standard - which only allows for 10% pavement (RAP) content for motorways and A-roads - had to be granted by Highways England for this project. Full story.

At Navartis, we're currently recruiting for a Surfacing Supervisor to work with our client, one of the UK's largest family-owned firms. See full details below and apply now. If this isn't the role for you, visit our Civils jobs page for information on nearly 300 Civils roles we have available.


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