Smarter ground solutions
Make better use of your site’s soils. Reduce muck-away. Build on stronger ground.
​Hawkes Group delivers soil stabilisation and ground improvement as part of our earthworks and enabling services. We help developers, main contractors and civil engineering teams improve suitable existing soils, reducing the need to excavate, dispose of material and replace it with imported aggregate.
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From improving wet clay for earthworks operations to constructing engineered formation layers, our approach brings soil treatment, material management and site preparation together in one coordinated package.
What is Soil Stabilisation?
Soil stabilisation is a practical ground improvement solution that strengthens existing soils, improves their suitability for construction and reduces the need for excavation and replacement.
How soil stabilisation works
Soil stabilisation improves the engineering properties of existing ground by mixing it with a carefully selected binder, such as lime, cement or a designed combination of materials.
Treating & Reusing Exisiting Soils
Instead of automatically removing weak material from site, stabilisation considers whether that material can be treated and reused where it is needed.
Improving Ground Performance
The treatment is selected to suit the soil and its intended use. It can improve workability, reduce plasticity and increase strength, helping suitable site-won material meet the requirements of the construction design.
More Efficient Earthworks
The result can be a more efficient earthworks operation, fewer vehicle movements and a reduced requirement for imported construction materials.
The Benefits of Soil Stabilisation
By treating and reusing suitable existing soils, ground improvement can offer significant practical, environmental and financial advantages over traditional excavation and replacement.
01
Stronger, More Stable Ground
Improve soil workability, strength and bearing performance to meet the requirements of your construction project.
02
Less Waste & Fewer Imports
Reduce muck-away, minimise lorry movements and make better use of suitable materials already on site.
03
Greater Cost & Time Efficiency
Reduce reliance on excavation, disposal and imported aggregates, with potential savings across your earthworks programme.
Our Soil Treatment Solutions
We offer a range of soil treatment solutions tailored to different ground conditions and construction requirements.
Lime Treatment & Soil Modification
Cement Stabilisation
Combined Lime & Cement Treatment
Lime Treatment & Soil Modification
Wet, cohesive soils can be difficult to excavate, handle and compact. Lime treatment can improve the condition of suitable clay soils, making them more workable and easier to incorporate into an earthworks scheme.
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Quicklime reacts with moisture in the soil, while lime treatment also changes the behaviour of clay particles. This can reduce stickiness and plasticity, helping the material break down and compact more effectively. Depending on the treatment design, lime may be used for short-term soil modification or to develop longer-term strength in suitable reactive soils.
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Typical uses include:
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Improving wet clay during bulk earthworks.
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Making suitable excavated material easier to handle and reuse.
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Supporting the construction of engineered fill.
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Improving formation conditions ahead of subsequent works.
Cement Stabilisation
Cement treatment binds suitable soil or granular material together to produce a stronger engineered layer.
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The binder content, mixing depth, moisture conditions and compaction requirements are established through testing and design. Treatment can support the construction of pavement foundations and other specified layers where improved strength and durability are required.
Applications may include formations beneath estate roads, access routes, car parks, commercial yards and industrial developments.
Combined Lime & Cement Treatment
Some soils benefit from a staged treatment.
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An initial lime application can improve the workability of cohesive material, allowing it to be broken down and mixed more effectively. A subsequent cement or other specified binder treatment can then develop the required engineering performance.
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The sequence, binder quantities and any time between treatment stages depend on the laboratory results and project specification.
Where Soil Stabilisation Can Be Used
We offer a range of soil treatment solutions tailored to different ground conditions and construction requirements.
Residential Developments
Improve suitable soils for housing infrastructure, including estate road formations, access routes and engineered earthworks, creating stronger ground for residential projects.
Temporary Access & Site Compounds
Improve ground conditions for temporary access routes, construction compounds and working areas, with treatment tailored to vehicle loading, drainage and project duration.
Working Platforms
Improve suitable ground for engineered working platforms supporting piling rigs, cranes and heavy equipment, with treatment designed around specific loading and ground conditions.
Bulk Earthworks &
Material Reuse
Treat and reuse suitable site-won soils within cut-and-fill operations, helping balance earthworks materials, reduce unnecessary disposal and minimise imported aggregate requirements.
Commercial & Industrial Sites
Prepare suitable formation layers beneath service yards, car parks and paved areas, with treatment designed to accommodate loading requirements and construction specifications.
How We Approach Your Project
Our approach to soil treatment follows a carefully planned process, from initial site assessment and testing through to treatment, compaction and final verification
Site Review & Planning
We review the proposed construction, available ground investigation information, earthworks drawings and programme.
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Access, existing services, drainage, working space and neighbouring properties are considered alongside the treatment requirements.
Early involvement helps identify where stabilisation could offer a practical alternative to excavation and replacement.
Soil Investigation & Treatment Design
Representative testing establishes whether the material is suitable and which treatment is appropriate.
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Depending on the project, assessment may include soil classification, moisture content, plasticity, organic content, sulphates, sulphides and strength testing.
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Laboratory trials establish the proposed binder type and quantity, together with the expected performance. Treatment depth and acceptance criteria are agreed to suit the engineering design.
Ground Preparation
The treatment area is prepared to the required levels, with obstructions and unsuitable materials addressed before mixing begins.
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Preparation may include excavation, grading, drainage measures and adjustment of the material’s moisture condition.
Controlled Binder Application & Mixing
The specified binder is applied at a controlled rate and mixed through the soil to the required depth using appropriate stabilisation equipment.
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Thorough mixing distributes the binder throughout the treatment layer. Where the design requires it, the material is allowed a controlled mellowing period before further mixing or treatment.
Compact Fixing
The treated material is compacted within the specified working period using suitable rollers.
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Moisture management, layer thickness and compaction are controlled to achieve the required result. The surface is trimmed to the design levels and protected or cured as specified.
Testing & Handover
Verification checks confirm whether the completed treatment meets the agreed acceptance criteria.
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Depending on the specification, checks may include binder application records, mixing depth, moisture content, density, strength and bearing performance.
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Subsequent construction proceeds once the relevant requirements have been satisfied.
Call Hawkes Group today at 0330 165 4882 to arrange a *free site survey or quote for your construction project.
Benefits For Your Project
We offer a range of soil treatment solutions tailored to different ground conditions and construction requirements.
01
Less muck-away
Retain more suitable material on site and reduce the excavation, haulage and disposal associated with replacement.
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Improved ground performance
Achieve the specified workability, strength or bearing characteristics through a treatment suited to the material.
02
Fewer lorry movements
Reducing exports and imports can ease pressure on site access, surrounding roads and delivery coordination.
05
Cost and programme savings
Compare stabilisation against the full cost of excavation and replacement, including disposal, imported materials, transport and construction time.
03
Better coordination
Integrate soil treatment with excavation, grading and compaction rather than managing these operations separately.
06
Reduced aggregate imports
Use treated site-won material where the design allows, reducing demand for imported stone.
Part of a Complete Earthworks Package
Soil stabilisation works best when it is considered alongside the wider site operation.​ We can combine ground improvement with: