Insitu Deep Recycling

Deep Recycling

Cold deep in situ recycling is a versatile specialist treatment used as an alternative to traditional construction methods and is suitable for use in both rural and urban environments.

Allasso Recycling offer clients full technical support from scheme feasibility through to end product testing, all provided by a team with market leading knowledge and experience. Cold deep in situ recycling is a tried and tested method of road construction that can be used for full width reconstruction or haunching works. The process offers a cost effective, sustainable and environmental alternative to traditional road construction.

The process is accepted by WRAP and the Environment Agency as the first choice when dealing with Tar Bound Material, allowing the material to be encapsulated in situ, removing the need for expensive landfill costs.

Allasso Recycling maximise the potential of the existing site materials by utilising the benefits of a full spectrum of binders, not solely relying on quick hydraulic binders such as OPC and OPC/PFA pre-blended binders. This approach allows a bespoke long term solution to all pavement deterioration.

The Process

The process begins with a site investigation with trial holes to establish the existing pavement construction and subgrade quality. Samples are taken from the site where laboratory testing of the material and mix designs take place.

Using the results of the laboratory investigations and other site data a pavement design is reached. Once on site the process begins with site pulverisation to the required depth, the selected binders are added and then mixed with a number of passes of specialist equipment to ensure a homogenous mix.

The site is then graded and compacted to the required levels with a curing membrane applied to the site prior to surfacing. Surfacing options are dependent on traffic loading and range from surface dressing to asphalt surfacing.

Throughout the process a UKAS accredited specialist laboratory technician is present ensuring material quality and compaction are achieved. This quality control ensures that the finished pavement delivers a serviceable life in line with conventional reconstruction.

The process is delivered in accordance with TRL 611.

The Benefits

environmental and sustainable

Environmental & Sustainable

  • Zero waste from site
  • Significantly reduced energy consumption and C02
  • The existing road is used as a source of roadstone aggregate, employing the 'linear quarry' principals.
  • No need for imported virgin aggregate
  • Significantly reduced lorry movements
  • Significantly less disruption to local residents and the surrounding highway network
  • The process allows tar bound material to remain on site
  • Secondary binders can be used in the process, further improving the environmental benefits
construction benefits

Construction Benefits

  • The subgrade is never exposed to the elements reducing the risk of soft spots
  • Significantly quicker construction time
  • A safe running surface can be maintained for access
  • The material quality is monitored throughout the works
  • Design life of the structural layer is in line with conventional reconstruction
  • Bespoke designs for individual sites
  • The road profile and level can be adjusted and improved


  • Significant cost savings against traditional reconstruction
  • A long term solution for a similar cost to short term patching solutions
  • Significant savings are further increased when dealing with tar bound material
  • Reduced Traffic Management costs due to shorter construction time
  • Reduced Site Management Costs due to shorter construction time

Deep in situ recycling allows local authorities, service providers and contractors the opportunity to deliver more for less, whilst contributing to sustainability and environmental targets. The process is not limited to sites that require full reconstruction as it gives asset managers an alternative to traditional patching treatments, providing a far superior end result for similar or reduced costs.