Characterization of Aging Infrastructure Using Ground Penetrating Radar

Speaker:
Nyambeni, Ngeletshedzo; Vaal University of Technology; South Africa

Authors:
Mabuza, B.R.; Vaal University of Technology; South Africa
Nyambeni, N.; Vaal University of Technology; South Africa

ID: ECNDT-0394-2018
Session: Civil Infrastructure - GPR
Room: J1
Date: 2018-06-12
Time: 10:50 - 11:10

This paper aims to study the aging infrastructure using Ground Penetrating Radar (GPR) as a Nondestructive Testing method. Applications of Nondestructive testing method to infrastructure focus on object identification such as steel bars, pipes and voids. For decades, GPR has been popular for characterization of the shallow subsurface systems. The method is commonly applied in the field of Civil engineering. GPR makes use of an antenna (consisting of a transmitter and receiver) that transmits electromagnetic waves into the subsurface which are then reflected back when they encounter an interface with two differing dielectric constants.

In our study, GPR is performed on concrete, building flooring and pathway pavement. Through these three civil infrastructures, we investigate the effects of the buried objects on the GPR responses. Special attention has been given to the processing of the acquired data where depth calculations are made, unwanted noise and interference is filtered out and adjustment of appropriate enhancements is done. From the results obtained, it is evident that various buried objects provides different responses displayed on the radargram. It has also been noted that appropriate adjustments to the radargram are necessary for effective interpretation of the radargram responses.