Conroy For BBUSL Bowthorpe, Norwich

Location: Bowthorpe, Norwich
Job Description: Main Renewal Scheme 180mm Diameter.
Material to be reprocessed: Approximately 2450 Tonnes.
Recycled Materials produced: C4/NFSMR (Non flowable material.)

Below shows the comparison between the methodology used on site by Conroy, where the material was reprocessed at Bowthorpe and used as backfill, sub-base and base layer compared to traditional methods where the material would typically be taken off site, tipped at a landfill/waste transfer station and then primary aggregates would be imported to be used as a backfill, sub-base.

Conroy have produced 2450 tonnes of C1.5/NFSMR through their mobile batching plant on site at Bowthorpe. The material was produced to be used as an alternative backfill to traditional foam concrete and used in a type 2 road.

Approximate Tons Used Type 1@ £23.75 Recycled Method @£18.50
2450 £58,187.5 £45,325
Total £58,187.5 £45,325
Savings £12,862.5


Muck Away @ £180 per Load Traditional Method Recycled Method
Lorry Movements 154 0
Cost of Tipping £27,720 0


Total Savings
Lorry Movements 154
Economical Savings £40,582.5


There are also economic savings in fuel, lorry and driver hire due to saving 1 day a week not having to wait for material to cure as with the traditional method of using Foam concrete.

Advantages of using C4NFSMR

  • Reduced lorry movements and local disruption from not having to send the sub-soil and clay segment of utility waste to landfill.
  • Elimination of the need for primary aggregates as the utility waste is recovered and used back in the utility trench replacing primary aggregates.
  • Reduced remediation costs due to the high performance /stiffness of the C4/NFSMR compared to traditional primary and secondary unbound material.
  • Increased production through immediate reinstatement as no waiting time for material to cure as with Foam concrete. This saves on average 1 day per week on overall costs of project.
  • Reduced fuel costs, lorry and driver hire through reduction in lorry movements.
  • Exceptional environmental savings due to minimising waste transfers, importing of virgin material, lorry movements, local disruption and sustainability targets exceeded.