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Distresses on asphalt pavements are associated to the traffic and moisture both in asphalt and granular layers. The traffic on road pavements is responsible by the occurrence of cracks that promote the pavement failure. The quality of the asphalt mixes, measured by its density, is an important factor to ensure the integrity of the pavements. The water in pavement surface decreases the driving comfort and reduces the asphalt-aggregate bond leading to the degradation of the asphalt materials. Thus, this paper uses Ground Penetrating Radar (GPR) tests to assess density and moisture content on asphalt mix slabs. Six asphalt mixes were produced in laboratory with the same aggregate gradation and asphalt type, varying the binder content (4.0, 5.0 and 6.0%) and the air-void content (from 3.7% up to 16.9%). For the assessment of the moisture content, each mix was tested with 5, 10, 20 and 40% of the air-void volume …