ScotAsh manufactures bespoke stabilisation solutions that can be used to stabilise contaminated land or to treat trench arisings, enabling spoil to be re-used in recycled roads projects.
Contaminated land, soils, sludges and industrial wastes can be treated using cementitious binders in a process called stabilisation/solidification (s/s). The chemical properties of the cementitious products immobilise contaminants (stabilisation) and the physical binding properties create a solid matrix (solidification).
Materials that are not contaminated but are unsuitable as a construction material such as wet sludges, dredgings or tunnel drilling muds can be treated using the same processes and products to make them suitable for use as construction materials. See our case study: Stabilisation of Sludges
ScotAsh also produces Trojan Envirocems. These are environmental cements used for stabilisation that are custom designed to meet the requirements of each specific project. Stabilisation and/or solidification techniques using cementitious binders are well established in both the US and the UK. The technology is capable of immobilising a range of inorganic and organic pollutants.
ScotAsh works closely with clients and often collaborate with expert third parties to develop innovative stabilisation solutions. The company teamed up with Professor George Fleming and a team at Strathclyde University to provide a solution for stabilising tributyl tin in harbour sludges on Tyneside.
In Scotland, ScotAsh has contributed to work by the Contaminated Land Assessment and Remediation Research Centre (CLARRC) on the treatment of mercury and other Persistent Bioaccumulative Toxic pollution, and has developed solutions and supplied products to treat muds from the tunnelling industry, oil industry and the construction industry, and to stabilise sewage sludge, paraffin waste and heavily contaminated canal dredgings.
There are a number of treatment options including in-situ, ex-situ and the new Accelerated Carbonation Technology (ACT).
Recycled Road Arisings
ScotAsh products were used to reinstate part of the historic carriage drive in Finsbury Park, London. The granular surfaced, asphalt road was excavated and the arisings were milled in situ and then stabilised by adding ScotAsh blended pozzolanic and hydraulic material. The rolled stabilised aggregate was then compacted back down, giving a good result with 100% recycled materials - and no heavy lorry movements through the park.
A similar project was conducted at Rainham Landfill site in Essex where a custom blended ScotAsh product was combined with crushed waste aggregates from the landfill site and used to reinstate the approach road.
Recently we have worked with Stabilised Pavements on sustainable road repair projects in Stirlingshire and Dumfriesshire.