Becton Bulk Fill Soil Stabilisation

Bulk Fill Treatment

Becton Bulk Fill Soil Stabilisation

Furlong GS provided a design and treatment package for Reynolds Groundwork Services in Becton, East London, improving excavated site-won material for reuse as bulk fill and beneath foundations.

Becton, East London 4 weeks

Project Overview

Reusing Excavated Material

The Becton project involved approximately 4,500m3 of excavated material that could not be reused as bulk fill without treatment. Furlong GS worked closely with Reynolds Groundwork Services to provide a design and treatment package, enabling the material to be improved for reuse on site rather than removed and replaced with imported fill. Earthworks were undertaken by the main contractor.

Laboratory Testing and Treatment Design

Following analysis and laboratory testing of the site-won material, Furlong GS designed the treatment plan to achieve a minimum 5.0% CBR in bulk fill and 15% CBR beneath foundations. The case study references MCHW Series 600 and CC201 in the design approach.

Ex-Situ Stabilisation and Layered Placement

The excavated material was treated and stabilised ex-situ alongside the works, then placed over the build-up area in 300mm layers and compacted. Foundations and trenches were subsequently excavated through the stabilised material, as shown in the project photographs.

Project and Client Benefits

The design and treatment package enabled site-won material to be used as acceptable bulk fill, saving time and money on the project. The published benefits charts report 50% cost saving, 45% programme reduction, 80% fewer vehicle movements, 80% less imported aggregate, 100% less material sent to landfill and 50% less stone layer depth.

The Challenge

  • Approximately 4,500m3 of excavated material was considered unsuitable for reuse as bulk fill without treatment and improvement.
  • Without treatment, the material potentially required removal from site and replacement with imported fill.
  • The project required material suitable for making up levels, with different CBR design requirements for bulk fill and beneath foundations.

The Solution

  • Worked with the client team to develop a design and treatment plan for the site-won material.
  • Analysed and laboratory-tested the material to design treatment for a minimum 5.0% CBR in bulk fill and 15% CBR beneath foundations.
  • Treated and stabilised the excavated material ex-situ alongside the works.
  • Placed the treated material over the build-up area in 300mm layers and compacted it.

The Outcome

  • Enabled excavated material to be reused on site as acceptable bulk fill.
  • Foundations and trenches were subsequently excavated through the stabilised material.
  • The case study reports a 4-week programme and approximately 4,500m3 of stabilised material.
  • The published benefits charts report 50% cost saving, 45% programme reduction and 80% fewer vehicle movements.
  • The charts also report 80% less imported aggregate, 100% less material sent to landfill and 50% less stone layer depth.

Site Images

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