This month, the toolbox tips have focused on quality control/quality assurance (QC/QA), especially as it relates to the lab. Today, let’s look at the data we’re gathering in the field.
QC/QA must include verifying and modifying roller patterns in the field. As we all know, achieving best compaction of the asphalt mat will directly affect the longevity of the pavement—and that’s a sustainability win. The sooner a roller operator can get feedback on his or her rolling pattern success, the better for the project, the pay and the carbon footprint overall.
When using the non-destructive density profiling system (DPS) to gather data, the QC/QA personnel will typically use one of two patterns immediately following the intermediate roller.
The swerve pattern sees the DPS scanner moving back and forth in a zig-zag pattern moving in the direction of construction—toward the paver.
The transverse slice pattern sees the DPS scanner moving back and forth straight across the width of the lane at pre-determined intervals.
Data gathered and interpreted in real time from either method can help the QC/QA team determine areas of uniform density where the rolling pattern is adequate and areas of inadequate density where rolling patterns or paving practices may need adjustment.
Don’t forget to run the DPS along the longitudinal joint as well.
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