Stabilisation / Solidification
Ash Remediation Management has extensive experience in the contaminated soil and sediment stabilisation / solidification field. Over the years we have completed numerous stabilisation / solidification projects successfully treating the hydrocarbon s TPH and PAH, cyanide, ammonium and heavy metal (including but not limited to copper, arsenic, chromium, cadmium, lead) issues.
Our stabilisation / solidification treatment methods can be applied in-situ or ex-situ. Dependent upon the requirements for dealing with organic e.g. hydrocarbon s and inorganic contaminated soil, various additives calculated on a site specific basis enable success following a single application.
The stabilisation / solidification treatment methods and technologies offered range from conventional cement / lime stabilisation to modified bentonites and organophillic clays. The combination of these provides capability across the full spectrum of the most common contamination problems.
Figure 1: in-situ stabilisation / solidification overlapping soil columns schematic.
Implementing in-situ stabilisation / solidification uses the soil mixing capabilities of a CFA piling rig or the Allu PMX Power Mixer. Both methods of application involve homogenising the contaminated material with the site specific S/S additive(s) (derived from feasibility trials) via ports located within the drilling head.
Once the desired drilling depth is achieved the auger is withdrawn with the direction of rotation remaining the same to further facilitate homogenisation of the soil column.
This description summarises the installation of a single soil column and the principle of the in-situ treatment method is based on a series of overlapping soil columns (see figure 1).
An auditable level of quality control is achieved through the use of a flow meter which measures the volume of stabilisation / solidification treatment slurry injected. All other drilling parameters are measured and recorded via the rig’s on board instrumentation which generate daily production data that is used in the quality control regime.
When stabilisation / solidification treatment is carried out ex-situ material is stockpiled and treated in batches using an excavator with a conventional or Allu bucket attachment. Material is deposited in a sealed bunded area and the stabilisation / solidification slurry is introduced whilst the excavator combines them to form a homogenous mass.
Specialist stabilisation / solidification plant such as a tractor pulled Stehr or Wirtgen can be used to facilitate the stabilisation / solidification process. These machines enable large volumes of material to be processed each day although they do require a larger working area.
To compliment the specialist stabilisation / solidification remediation works, Ash Remediation Management offer a full capability of general earthworks. Services include safe and controlled excavations as well as segregation and screening of materials to maximise reuse of site won material.