Innovative Sensor Technologies for Nondestructive Imaging of Concrete Structures: Novel Tools Utilising Radar and Induction Technologies

Abstract

Nondestructive testing methods in building construction and civil engineering are needed to avoid costly damages caused by cutting reinforcement during drilling and coring and to image structures for condition assessment and evaluation. In this paper, the technology and application of two of Hilti’s nondestructive imaging tools are presented. The handheld wall penetrating radar system is suited to locate various objects, such as rebar, tendons, conduits, pipes, cables, voids, etc. in concrete. The radar tool comprises an antenna array for quick scanning and high data quality, real-time processing and visualisation for easy interpretation and 3D data representation available at the job-site. Furthermore, reinforcement verification, measurement of concrete coverage and statistical analysis can be performed with the Hilti Ferroscan system based on electromagnetic induction.