Compaction values for four soil types (specific weight and optimum water content) - according to AASHTO Standard and Modified compaction tests (SN 670 330 b) - will be obtained in the laboratory of the Federal Institute of Technology, Institute of Geotechnical Engineering. The correlation between the specific weights resulting from AASHTO Standard and Modified tests will then be calculated. This correlation is important for compaction testing in the field, since usually heavy compaction machinery is used. The finding obtained can be adopted in a future revision of SN 670 330 b.