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The use of unbound granular material is common practice for many airfield pavements,however the implementation of fundamental design criteria is not a standard procedure. The mainconcern is permanent deformation under the heavy wheel loads of the NLA type of aircraftinfluenced by the non-linear behavior in combination with stress dependency. In the past earlyfailures have been reported due to water trapped in this unbound layer. The use of high qualitycrushed aggregates with good drainage characteristics and extra drainage measures will preventwater being trapped in this layer. An analysis of the behavior of unbound crushed Basalt under awheel load of an A380 was carried out based on its stress dependent characteristics. The materialparameters needed to analyze the permanent deformation behavior are determined in a laboratoryinvestigation by use of cyclic triaxial testing [10]. The triaxial cell used has a diameter of 300mm and a height of 600 mm. The stress dependent resilient modulus Mr is most commonlydescribed by the Mr-? model:
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