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In 2015 approximately 1.5 million tonnes of aggregate material were was used on state highway improvement and maintenance projects, as well as 54,000 tonnes of bitumen binder.

Of that, about 3% of road pavement material and 2% of road surface materials have incorporated some degree of recycled material. Typical recycled materials include crushed concrete, melter slag, glass and recycled surface material.

Since 2011, Glenbrook melter slag represents 89% of the recycled materials used for road surfaces. For pavement materials, a composite of mixed recycled materials represents the majority of the recycled materials used.

Recognising the potential for improving overall resource efficiency, the Transport Agency is exploring opportunities to increase the uptake of recycled and alternative materials without compromising the quality of our state highways.

NZ Transport Agency research

The Transport Agency supports research that helps deliver on its objective to be resource efficient. Current research projects include:

  • Rubber in roads
  • Recycled aggregate waste research
  • Epoxy modified OGPA

For further information contact environment@nzta.govt.nz.

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