Ground penetrating radar is a nondestructive test method, which involves
the transmission and reflection of electromagnetic waves into the
structure or material. The principal of surface penetrating or ground
penetrating radar is analogous to pulse echo ultrasonic techniques, except
that it uses electromagnetic instead of acoustic waves.
The GPR test method is commonly used to: estimate the thickness of
concrete members and multi-layer systems, locate embedded
reinforcement and underground utilities, measure concrete cover
thickness, locate moisture variations, locate voids and delineate its size,
locate honeycombing, cracking, and delaminations in concrete.
GPR is also used to investigate other construction materials such as stone
and masonry. It is very effective in determining the grout conditions of
CMU wall systems.