Physical Stabilisation / Ground Improvement
Physical stabilisation is the process of improving the geotechnical properties of a material through the addition of hydraulic binders such as cement and lime.
The stabilisation process has been successfully used for a number of years and depending on the blend of additives, CBR values in excess of 30% can be achieved.
Some of the geotechnical improvements that can be achieved using the soil stabilisation process are listed below:
- Soil stabilisation can be used to reduce permeability and compressibility
- Soil stabilisation can increase bearing capacity
- Soil stabilisation can increase shear strength
- Soil stabilisation can decrease the void ratio
The stabilisation process is applied through specialist mixing plant, namely a tractor pulled Stehr, a Wirtgen or the Allu PMX Power Mixer. The nature of this specialist mixing plant enables large volumes of material to be processed and realistic throughputs of >1500m3/day can be achieved.
Listed below are some of the benefits to on site stabilisation:
- Minimised environmental impact – conventional ground improvement techniques involve the excavation and removal of unsuitable materials and the importation of large quantities of virgin aggregates. In stabilisation this process is replaced by the importation and in-situ mixing of much smaller quantities of binders (>95% reduction in import volumes)
- Reduced project costs – soil stabilisation eliminates the requirement for the removal of unsuitable material and the purchase of aggregates
- Shorter project timescales – the stabilisation process is consistently more time efficient than the muck away and aggregate import option
- Durability – the finished product is highly durable
- Laboratory testing – all work can be validated using a third party UKAS accredited geotechnical laboratory