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For 150 years Tarmac have been at the forefront of UK construction, leading the development of modern paved surfaces from roads and runways to racetracks.
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THE CIRCUIT
Situated in North Yorkshire, the Croft circuit is one of the most challenging circuits in the UK. At 2.1 miles in length, combining high and low speed corners, it has a reputation as a real driver's circuit.

Developed from an RAF airfield to a race track in the mid 1960’s, Croft has a proud racing history and is a permanent fixture on the British Touring Car Championship calendar. The client required works to be completed during a two week closure of the circuit between 25 March and 7 April 2019.


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CHALLENGES
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Motor racing circuits represent one of the most demanding environments for paving engineers. They combine stringent texture requirements and very tight surface tolerances that are frequently down to just a few millimetres across the width of a track. Track surfaces are also subject to extreme shear forces, particularly during cornering and braking. As a result they require precision engineering to produce a track that offers drivers the consistent grip and predictable handling they need, along with long lasting texture and durability.
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Total Styrelf GP™

Tarmac and Total worked collaboratively to develop a mix design that met the stringent requirements of this circuit. The result of this combined expertise and knowledge was ULTITRACK Motorsport asphalt using a high performance Total Styrelf GP™ polymer modified bitumen binder and a carefully selected aggregate with a high polished stone value. The advanced binder has been proven on some of the leading race tracks in the world including the Circuit de Barcelona-Catalunya and Circuito de Jerez in Spain. It effectively locks in aggregate and has impressive fatigue resistance, with the ability to withstand repeated loading on the race track but still return to its original shape without permanent deformation of the surface.
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Seamless
surfacing

The laying programme was designed to minimise joints, especially in critical areas of the circuit around bends and breaking areas and across the racing line. Echelon paving was used, with two paving machines working simultaneously to ensure continuous hot jointing of the asphalt along the 3200 metre length of the circuit.

Automated
paving technology

Automated paving technology used real time data from sensors to detect any irregularities and correct them, to optimise the pavement quality during laying and compaction. This ensured that the surface met the required tolerances.

Non stop
asphalt supply

Asphalt was supplied from three Tarmac asphalt plants at Cross Green, Coxhoe and Teesport with trial mixes tested on the site to guarantee absolute consistency between plants.

Planning and logistics

Over 40 vehicles were allocated to maintain a continuous supply of material. Advanced BPO logistics software enabled real time tracking and control or vehicles between the plant and circuit. When combined with detailed planning and effective traffic management, this allowed continuous supply of asphalt at optimal paving temperature. It also dramatically reduced wasted material which helped to reduce disposal costs and improve sustainability.

 
 
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Work was completed on time and on budget over five days in early April 2019. Around 1600 tonnes of asphalt was laid per shift. The client was delighted with the outcome.

Ultimately though, the best judge of the quality of the surface is a professional racing driver.

 
 

Here is what Colin Turkington, current and three times British Touring Car Champion had to say about the new surface:

“I was really impressed with the resurfacing at Croft. The new tarmac made a significant improvement to the grip levels in both wet and dry conditions and for a driver, more grip means more speed, so that’s perfect. The big gains I felt were under heavy braking from high speed into Clervaux and Tower bend. Traction from the slow speed corners was also significantly better and in total we were lapping around 2 seconds quicker than last year. That’s a massive gain in lap time!

“There are endless combinations of settings we can put on the car to achieve the perfect set up and feeling, but ultimately the tyre is your main spring and primary contact patch with the road, so its relationship with the tarmac is crucial. Before the resurfacing, Croft was regarded as a very bumpy track with lots of small undulations making it difficult for the tyre to follow the road, so the setup on the car was always compromise. I found it much easier this time to get the car tuned in for the smooth surface and ultimately we were fast. I wish more tracks were as good as this!”

Find out more

For more details on this project and our asphalt technology:

0330 404 7299
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