The lifespan of asphalt surfacing depends entirely on the stability of the underlying earth. Subgrade preparation involves soil classification, moisture conditioning, and multi-pass vibratory compaction.
Key questions answered for developers and civil engineers
The top 300mm of road subgrade must achieve at least 95% Maximum Dry Density (MDD) for secondary roads, and 98% MDD (AASHTO T180 / ASTM D1557) for major transit and heavy commercial roads.
Get in touch with our expert engineering team for a detailed consultation and quotation.
Consult with our Engineers