This research proposes a new practical method for predicting the performance of unbound granular materials, including alternative, industrial by-products and recycled materials in New Zealand.
This investigation, carried out in 2005, utilised available field performance data in New Zealand to calibrate/validate available material assessment methods based on laboratory repeated load triaxial testing. The recommendation is that the simple ARRB performance assessment method, which is based on a reduced set of permanent strain results obtained from the existing Austroads repeated load triaxial test method, be used in material specification.
Further research should be undertaken to improve and simplify general deformation prediction models, which are based on a full set of permanent strain results at various tress levels, to make them suitable for practical use in pavement design.
Keywords: aggregates, deformation, performance specifications, recycled materials, repeated load triaxial, rutting