The tests that are used in the UK to assess deformation resistance of asphalt mixtures by simulation from wheel tracking have changed in recent years with the introduction of European standards. The new standard allows either a small or a large device to be used depending on the maximum axle load being designed for. Each test method measures the deformation resistance using slightly different parameters. Comparative studies have been undertaken using each of the new methods plus the old UK method with two laboratories and two methods of compaction: roller and vibratory. The results have been compared to assess the relationships between the parameters, the influence of the method of compaction and an indication of the precision of the tests. Unexpected outcomes of the results are the inability of the traditional design of the large size device to deal with mixtures having limited deformation resistance and the affect of air voids content on the deformation resistance of category 2 Enrobé à Module Élevé mixtures.

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