MaineDOT Uses GPR for Pavement Evaluation

摘要

Maine is one of several states that have conducted pilot studies using PaveScan RDM equipment. The PaveScan RDM uses one or three 2-GHz sensors mounted on a portable push cart that can scan up to a 6-foot width. Each antenna collects a continuous line of dielectric/density. An onboard computer captures dielectric values, which can be correlated to core densities. Operators scan a pavement section and the device identifies high, low, and median density locations. They take a static reading directly over each location, obtain cores at each location, and then test the cores, entering the results in the software. Correlation accuracy depends on obtaining core densities over the entire range of measured dielectric values.