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Recycled and alternative materials currently allowed on Waka Kotahi projects

The list below of surface and pavement standards outlines the recycled materials currently allowed on Waka Kotahi projects. The list also provides limitations by volume of mass and relevant comments with regards to the material use.

Overview of recycled materials allowed by Waka Kotahi

M3 - Sub-base aggregate

Material type Allowed % by mass Comment
Various Yes No restriction

There is no standard TNZ/M3, as the variety of materials satisfactory for sub-bases is too wide to set a national or regional standard specification. 

TNZ/M3, however, provides guidance on developing a local specification for sub-base aggregates. 

Generally, there is no upper limit for recycled material content. 

Local specification using recycled material other than glass will need to be approved by the appropriate regional council. 

M4 - Basecourse aggregate

Material type Allowed % by mass Comment
Recycled crushed concrete (RCC) Yes No restriction RCC use must be approved by the appropriate regional council.
Glenbrook melter slag Yes No restriction Slag use must be approved by the appropriate regional council. 
Reclaimed glass Yes 5% Proportions of cullet in excess of 5% may be used at the discretion of the National Pavements Manager (Waka Kotahi NZ Transport Agency), provided that the requirements of the T/15 specification have been satisfied. 

M6 - Sealing chip

Material type Allowed % by mass Comment
Glenbrook melter slag Yes No restriction  

M10 - Dense graded stone mastic asphalt

Material type Allowed % by mass Comment
Recycled asphalt pavement (RAP) Yes <15% No restrictions. 
15% - 30% Needs to meet mixed design requirements. 
>30% Requires approval of the National Pavements Manager (Waka Kotahi NZ Transport Agency). 
Coarse recycled aggregate material Yes No restriction Subject to the engineer's approval (includes slag or glass, or other materials approved by the engineer).

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