Heavy Duty Pavement for New Zealand Steel Laydown
Heavy-duty Pavement for New Zealand Steel.
Constructed in 2025.
Benefits:
- Reduced maintenance Two InterAx layers mitigate rutting and minimise long-term maintenance under 83-tonne loads
- Design flexibility Tensar+ HHR approach accommodates non-standard brown rock (≤100mm particle size) while maintaining performance
- Enhanced durability The Tensar mechanically stabilised pavement delivers superior performance compared to original section without geogrid
The client required a durable, heavy-duty pavement solution for their laydown yard, which would be constructed over a moderate-strength subgrade with a CBR of 6%. The pavement specification needed to accommodate heavy traffic loading from 52-tonne forklifts used for handling steel coils, with each forklift generating front axle loads of up to 83 tonnes.
Pavement design optimised using Tensar+ HHR (Heavy Haul Road) module with LAAMS approach to mitigate rutting over the 5-year design life. Initially designed with GAP65 aggregate, the specification adapted to non-standard brown rock aggregate with ≤100mm maximum particle size and 75mm rut depth limit. Two layers of InterAx geogrid enable a thicker, more durable pavement compared to the original section without geogrid, significantly reducing long-term maintenance requirements.
