Ground penetrating radar as a quality assurance method for paved and gravel roads in finland

Abstract

This paper describes a new quality assurance procedure developed by Roadscanners Oy for gravel and paved road evaluation. Ground-penetrating radar (GPR) techniques have been successfully applied in different road rehabilitation projects in Finland. Quality assurance measurements are done with 1.0 or 2.2 GHz air-coupled antennas and 400 MHz groundcoupled antennas together with supporting information gathered from core samples, rutting and roughness data. A video and Global Positioning System (GPS) data are collected together with the GPR data. GPR techniques have been used to measure layer thickness, to identify transition wedges and their inclination, to detect steel nets and bedrock surface location.