This paper gives the results of a Transfund New Zealand funded Research Project with the objective of facilitating the recycling of asphalt mix and ground tyre rubber (GTR) from waste tyres in New Zealand roads. The paper gives the laboratory and field test results that have been used to revise the Transit New Zealand M/10 Asphaltic Concrete Specification to allow the use of 15 per cent of recycled asphalt (RAP). Tests included Marshall Stability and Flow as well as Resilient Modulus tests with up to 40 per cent of RAP. Test results from the road trials of the material, laid during 2003 in Manukau City, Auckland, are also given. Results are also given of the properties of mixes incorporating ground tyre rubber (GTR). Preliminary results from road trials using 3 per cent recycled rubber laid in Manukau City, Auckland in 2004 are given. These results have been used to give examples of where the benefits of increased flexibility (fatigue resistance) could make this a cost effective treatment. (a) For the covering entry of this conference, please see ITRD abstract no. E212706.
Samenvatting