scope:

This European Standard specifies test procedures for determining the resilient and permanent behaviour of unbound mixtures under conditions that simulate the physical conditions and stress states of these materials in pavement layers subjected to moving loads. These procedures allow to determine mechanical properties that can be used for performance ranking of materials and for calculating the structural responses of pavement structures. The test is applicable to cylindrical specimens of unbound mixtures prepared by laboratory compaction, with an absolute maximum particle size smaller than one fifth of the specimen diameter. For the loading of the specimen, two methods are provided : - Method A: The Variable Confining Pressure method in which the cell pressure is cycled in phase with the axial load. - Method B: The Constant Confining Pressure method in which only cyclic axial loading and constant confining pressure are performed.