Specialist processes and surface treatments


Carbon-friendly recycling processes

Our three Recycling processes lower CO2 emissions, cut landfill waste and minimise lorry movements. Repave, Retread and Deep Recycling provide a choice of environment-friendly options that reduce energy consumption throughout the construction cycle, as well as shortening repair time and easing disruption to road users.

Choose the greenest

Colas independent experts are on hand to give guidance on the best recycling option. Our environmental calculator offers you a quick tool to compare the impact of surfacing solutions and make the most sustainable choices.


The Repave process involves heating the road surface to create a plasticised asphalt layer, before scarifying. A new, thinner asphalt layer is then superimposed to provide a homogenous asphaltic layer up to 50mm deep.

  • Compatible with any type of surface course including HRA, SMA or bituminous macadam
  • Gullies may not require adjustment, saving time and money
  • Resurfacing is possible at any time of year, or in bad weather


First, the road surface is broken down. This material is graded to form the new profile. Retread emulsion is mixed into the existing pavement and the surface compacted. Binder and chippings are rolled in to close surface voids before a double surface dressing is applied.

  • Reduces cost by working to existing levels, leaving kerbs and iron work undisturbed
  • Choice of final surfaces can be applied as necessary
  • Recycles the existing pavement in-situ to form a durable reprofiled carriageway rather than planing off and discarding old material

Deep recycling

After pulverisation, the surface is compacted and trimmed. Excess material is removed before recycling the existing pavements. Emulsion and hydraulic binders are combined with the existing material. Once the recycling is complete, the material is compacted again, surface-shaped and coated with bituminous emulsion and sealing grit.

  • Conserves natural resources by recycling materials such as china clay and glass
  • Complies with EU regulation by treating tar-bound layers in-situ without the need for costly removal
  • Up to 1500m² per day can be processed

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