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A hot-to-cold longitudinal joint can look perfectly smooth and still be short on density. A few lessons on edge preparation, extra mix for compaction, overlap and where to put the first roller pass.
Asphalt density depends on how long the mix stays hot enough to work, and on roller speed and vibration settings. Once the mat has cooled, extra passes do very little.
When the mat goes thick and thin, the screed is usually the first thing people adjust, even though the cause is often somewhere else. A few lessons from the job site on adjusting, paver speed and the mix in front of the augers.