The requirement for a performance based test for unbound and weak hydraulically boun materials (HBMs), which also simple to use in comparison with research based apparatus, was identified some years ago as being key to characterising non standard and stabilised pavement foundation materials. resilient modulus and permanent deformation resistence were identified as key material performance properties to be determined, both for input into new UK design procedures (where pavement thickness will depend on foundation class) and for assessing potential
constructability prior to more expensive trials. Designs features for such a test include the potential constructability prior to more expensive trials. Design features for such a test include the
incorporation of an aggregate size up to 40 mm, the ability to cure HBM samples other than in the compaction mould or the test equipment itself, and utilisation of the standard Nottingham Asphalt Tester (NAT) loading frame, which is widely used for the testing of asphalt samples.
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