The recycling and stabilising process
Recycling road pavement is the process of mixing existing road material insitu with a road stabiliser machine whilst incorporating moisture if required, then re-compacting the material to improve the road profile and road performance.
Stabilising is a form of recycling, but also incorporates an additive to provide additional strength and lasting quality to the insitu materials. Stabilising increases the life of the pavement material which can reduce the road’s long-term maintenance costs and provide a safer road surface for motorists.
Existing materials can be modified with 1 – 6% additive, providing a cost effective alternative to importing other pavement material. This allows for larger areas of road to be widened and/or rehabilitated from the same funding allocation.
Additives on stabilising projects include cement, cement/slag blends, cement/flyash blends, cement/flyash/lime blends, hydrated lime, quick lime and foamed bitumen.
During preconstruction, tests are performed on the material to be stabilised, determining which additive and application rate should be used. This determines which additive will maximise the quality of the pavement ensuring longer lasting life of the asset.
Road recycling is a process that has been widely adopted for rehabilitation of road assets throughout the pavement industry. Road recycling is not only a cost efficient process but generally offers construction time savings and sustainable solutions.
Environmental benefits of road recycling often include the following aspects:
- Significant reduction in the use of virgin quarry materials
- Minimal generation of construction waste through the use of insitu material
- Reduced trucking movements as a result of limited importing or exporting of materials form site
- Reduction in emissions, energy use and noise due to shorter construction duration