||An Evaluation of the Potential Use of Non-Nuclear Pavement Density Testing Devices for Hot-Mix Asphalt (HMA) Acceptance
This study will determine if two new non-nuclear density gauges (PaveTracker Plus and PQI 301) are equally or better suited for hot-mix asphalt acceptance as currently specified nuclear gauges. Non-nuclear density gauges contain no radioactive source materials.
VDOT follows Virginia Test Method 76 for HMA acceptance in the field. This specifies a two-step procedure with both a control strip and the mainline pavement (the rest of the works besides the control strip).
Within the control strip, a nuclear density gauge measures the pavement density at 10 stratified random locations. Next, cores or plugs are collected at the three locations where the density reading is nearest the average nuclear density gauge reading.
If the average density is acceptable, the control strip is accepted as part of the permanent works. The average density gauge reading of the 10 stratified random locations – the target density – forms the basis for acceptance of the remainder of the project.