Soil Remediation Process Overview
Every one of our Soil Stabilisation machines uses an integrated system, whereby the blending of the soil with the binder takes place within a confined mixing drum, which feeds the lime or cement powder through a sealed hopper. The percentage of the binder additive is computer controlled which ensures the spread rate of powder is gauged by the speed of the drum; therefore the correct volumne of binder is ensured, with virtually no dust emission to the atmosphere. All powder is stored on site in sealed silos and the binder is pumped via compressed air into the machine.
Technical
Lime Modification and Stabilisation
The addition of lime to cohesive soil results in immediate improvements in strengh and plasticity (modificaiton). Longer term soil-lime pozzolanic reactions lead to the formation of compounds by which the modified material becomes cemented, thus increasing strength and durability (stabilisation).
The advantages in drying, workability and performance of the lime ameded soil lends the process to numerous applications including;
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Cement Stabilisation
Once a clay soil has been made viable by the addition of lime, or if a soil of a gravel/sand/crushed concrete nature; the addition of cement can greatly enhance the materials performance. Apart from the obvious strength gain associated with cement addition, other advantages include;
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increased durability, stiffness and bearing capacity
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increased resistance to frost and weathering
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increased impermeability
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containment of contaminants (subject to testing)
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greater control of swelling
Typical uses for cement stabilised solutions include;
- sub-base replacement layers in lieu of imported MOT Type 1
- high strength capping layers
- piling mat construction
- roadbase replacement layers upon which tarmacadam base and wearing course can be applied
- solidification as a means of treaing contaminated soils (ie. chemically binding free liquid, encapsulating waste particles, chemically fixing hazardous elements)