Northstone

The system provides a structurally sound road surface up to a depth of 300 mm using the existing road materials and adding foamed bitumen or emulsion with cement. It provides an excellent base or binder course in preparation for a surface course material.

Typical Applications

The system is suitable for all classes of roads including:

• New Construction and Design and Build Projects.
• Bog rampart roads where additional loading by conventional means will cause rapid failure.
• Roads and streetworks where existing level constraints prevent raising the road by more than the surface course.
• Roads where existing utilities prevents excavation and full reconstruction.
• Roads where suitable quarry materials are not readily available.

Envirnomental Benefits

• Fewer traffic movements on public roads through a reduction in materials delivered to and from site resulting in a lower carbon footprint for the project.
• Reduced CO₂ emissions and lower energy consumption through a reduction in the volume of hot material required.
• In situ materials are strengthened and re-used eliminating the waste going to land-fill, thus increasing environmental and economic benefits.
• Extending the life of existing rock reserves through more sustainable extraction due to the recycling of existing pavement materials.

Preparation and Installation

The process involves the pulverisation of the existing road surface up to a maximum depth of 300 mm. Rock fines can be added at this stage if tests determine that the materials are too coarse. The pulverised material is then graded to the required levels and compacted. Stabilisation subsequently takes place with cement being added to the new surface at a pre-determined rate of spread. The surface is then pulverised again with Foam Bitumen injected into to the mix. The surface is finally regraded and compacted in preparation for a regulating or surface course finish.