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During the past few years, the implementation of the nuclear gauge method of testing hot mix asphalt for desired compaction has proven a non-destructive and timesaving option. However, discrepancies between contractors and WisDOT readings have led to this research which serves to investigate the relationship between the temperature and density of newly placed hot mix asphalt. The theory states that as asphalt cools, it becomes denser. Hence, if a nuclear gauge is used to measure density after the asphalt has been allowed to cool, it should record a higher reading than when the asphalt was measured just after cold rolling the previous day. This research investigation has found a model that has not reinforced this theory. The research has shown that testing a road for density the morning following paving will not result in a significant difference in density than if it is tested the same day of paving.