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Ground Penetrating Radar Systems

Void Detection

by Amy Hall

Using GPR for Void Detection

Void detection in concrete slabs is possible using Ground Penetrating Radar Systems. The specialized equipment can accurately detect and locate rebar, conduit, cables, and voids in concrete and other non-conductive material. This is an enormous help for transportation and structural engineers when they are in the planning phase of big projects, such as highway, bridge, or building construction.

The use of quality systems using GPR allows engineers to certify on the plans that a certain level of accuracy and comprehensiveness has been provided. Project plans can then move forward as the subsurface utility conditions are known. Non-destructive concrete testing saves on time and money, which is always a bonus as construction projects are notoriously over-budget.

System Operation

Most GPR systems work in basically the same way. A handle or antenna is a tool that is scanned over the targeted area, which is designed to pick up radio pulses from embedded utilities. From a series of scans, the target depth and spacing can be determined and laid out directly on the surface for trouble free cutting, coring, digging, or drilling.

Further analysis can be done when this collected data is downloaded onto a laptop for closer viewing. It is possible to exactly pinpoint all void detection and subsurface utilities using this method, without ever having to disturb the integrity of the surface. This is a huge safety measure, as the chance for cutting into electrical wires or cables is virtually eliminated when a GPR system is in place.

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