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STABILIG - How it works and why?
(Patent protected)
Stabilig has a wide range of product types and grades.
The three main components are a blend of natural organic carbonaceous polymers, cement and lime.
All components are binders and stabilisers in their own right, and all have certain limitations which reduce their effectiveness in soil. The combination of the components reduces these limitations and improves the performance of each.
This opens up a much wider range of soils for stabilisation, introduces resilience and eliminates most reflective cracking in the vast majority of cases.
Cement and Lime, as well as performing in soil as binders etc, are strong oxidising agents with relatively high pH. The natural organic polymers have slightly acidic pH readings.
The polymers have a strong bonding capability. The polymers are like water based bitumen or pitch type material. They are soluble, sometimes up to 98%
When applied to and mixed into soil and compacted, they make a strong resilient binder. When mixed and compacted in certain soils, bond strength up to 35MPA may be achieved.
The polymers slowly oxidise in the soil to long chain water resistant molecules. Unfortunately, the oxidation time is often too long, subjecting the stabilisation to the risk of water damage. By combining the polymers with cement and lime, we achieve rapid oxidation and water resistance for the polymers, whilst retaining the binding capacity and advantages
of each component.
As the polymers provide a microscopic coating on particles of soil in the mixing process, we therefore obtain water resistant coating that forms a highly water resistant pavement.
By stabilising with Stabilig soils which have 15% to 20% minus 0.075mm particles or more, a granular stabilised pavement is produced which is also effectively a “bound flexible pavement”. Often a pavement stabilised with Stabilig (a “bound flexible pavement”) is more tightly bound than some concrete.
Depending on the type of soils stabilised, Stabilig becomes not unlike a flexible concrete. The process of curing generates some heat and drives off almost all moisture in the pavement, and as it is bound the pavement is frost heave resistant. Like concrete, it is a dry bound pavement.
Whilst we have indicated it is possible with the polymer blends to achieve up to 35MPA bonds, the normal road pavement to be stabilised results in the 0.5MPA to 2MPA range.
Stabilig has been proven to be effective in soils with California Bearing Ratio of 3 upward, which are over sub-grades with CBR’s of 2.
Stabilig performs reliably in soils with plasticity indices from 0 to 40.
Because the polymers in Stabilig are like bitumen or pitch the pavement is effectively primed for sealing to the depth of the stabilisation. The strength of the bond to hot bitumen or bituminous emulsion seals is much stronger and far more reliable than to bitumen and kerosene or similar light oil primers. These primers are not required and should
not be used on bases stabilised with Stabilig.
Stabilised sub-bases for concrete provide a highly resilient pad on which to lay a concrete pavement. They generally resist stress cracking and movement of the concrete.
Summarising, Stabilig binds soil as a stabiliser in the form of either a strongly bound, highly resilient granular pavement, or a fully bound flexible resilient pavement that, in some cases, is stronger than concrete. All pavement bases stabilised with Stabilig are primed to their full depth ready for bitumen or asphalt seals.
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