A low cost chemical soil additive for compacting & stabilizing graded roads

Roadbond is a chemical soil stabiliser and a compaction aid. When mixed with soils, it has the effect of reducing shrink/swell activity of expansive clays and enhances compaction of all types of construction materials.

The Roadbond molecule contains a hydrophyllic head and a hydrophobic tail. When mixed with soils, the hydrophyllic head attaches to the soil particles and coats them. The hydrophobic tail repels moisture away from the soil particle surface. This two-fold process is efficiently responsible for reducing shrink/swell activity in expansive clays. Construction materials treated with Roadbond can be re-worked without the need to add more Roadbond.

Engineers engaged in road construction and other major earth moving and construction projects such as airstrips, dams and industrial hardstandings, easily understand the cost and other advantages of using Roadbond. Roadbond is only used on site after correct and comprehensive laboratory procedures have been carried out to determine dosage for optimum results in treating the soil being used for the road. Roadbond is environmentally friendly and is not detrimental to ground or sub-surface water. Roadbond has been shown to encourage the growth of grass on cut and fill banks.

Roadbond has been tested on a variety of construction materials and test results have shown that it works effectively on materials ranging from non-plastic to highly plastic soils. Research and development continues with the object of providing users of Roadbond with a product and technical proficiency which is superior in all respects, as we continue building roads to build nations.

Advantages of Roadbond:
  • Reduced material borrow and hauling costs
  • Reduced deterioration rate of unpaved roads
  • Reduced maintenance requirements
  • Any surface layer can be applied on top of the Roadbond sub layer


Estcourt Region: Road No. P178, Kamberg, July 1995. Stabilised road, unsurfaced for 6 months. Road has not been damaged by tracking, washboarding or potholes despite heavy rains.

KwaZulu-Natal, South Africa

Estcourt Region: Road No. P178, Kamberg, January 1995. Typical surface pattern of Chemically stabilized road.

Estcourt Region: Road No. P178, Kamberg, July 1995. Another view showing good condition of this unsurfaced stabilized road.


Estcourt Region: Road No. P178, Kamberg, August 1995. This road was left unsurfaced for 6 months without damage. Photograph taken on completion of single bitumen/sand seal. Note surplus quarry waste on road which will be consolidated with underlying bitumen, by traffic.


On site discussion with client, compaction nearing completion


Roadbond Stabilisation of Fish Phonds at Tannah Haven, Queensland. Second pass of rotary hoe + application of Roadbond.