The response of ground penetrating radar (GPR) to changes in temperature and moisture condition of pavement materials

The dielectric properties of pavement materials are of great importance when conducting GPR investigations, and Daniels (2004) provides a good overview. Dielectric substances are those which are poor conductors of electricity, but support electrostatic fields well, and the dielectric permittivity of a substance refers to its ability to store (i.e. ‘permit’) an electric field which has been applied to it.