Carnell worked in collaboration with BEAR Scotland, the maintenance contractor for Highway Management (Scotland) Ltd who operate and maintain Transport Scotland’s M80 DBFO, to undertake filter drain refurbishment between junctions 5&7 in June 2023.
Using the StoneMaster process to recycle the filter drain media in-situ, provided several carbon, safety and road user benefits over the traditional dig-out and replace method. In addition, the innovative SmartScan survey which took place in advance, identified the areas most in need of attention, enabling a targeted solution.
The 2,800m length of filter drain was brought back to specification in 9 night shifts. By only taking away non-compliant material, 420 lorry journeys were removed from the network, while the reduction of materials, haulage and waste disposal led to a reduction in CO2e emissions of over 28 tonnes.
Using StoneMaster on the M80 to recycle the filter drain in-situ resulted in:
- 2,800m of safer road.
- Re-use of 2,282 tonnes of aggregate. (As heavy as 20 blue whales).
- 5,736 fewer HGV miles transporting materials (A distance longer than the Great Wall of China).
- Reduction of 15,049m3 CO2e. (The same volume as 6 hot air balloons).