The concrete is scanned with ground penetrating radar. A device is passed over the exposed surface of the concrete, sending a signal into the concrete. The signal is deflected back to the device in different patterns depending on the type of material in the concrete and the depth of the material. We use the latest technology, developed by the world's leading GPR manufacturer, to locate and record the details of ducts and services.
Our specialist technicians use a range of antennae that enable us to accurately locate rebar, post-tensioning, ducts and voids within and below slabs, as well as detect utilities, subsidence, services, data, stormwater and sewerage to a depth of up to 5m. We also carry out concrete testing. United Scanning is an expert in the field of concrete scanning, often called concrete x-ray scanning or slab scanning. We provide our clients with fast and accurate information about the structure, strength and composition of their concrete structures.
We provide structural engineers, building contractors, forensic experts and concrete specialists with the essential information they need and serve multinational companies, engineering and construction specialists, local and state government agencies, as well as residential and small business customers. Ground penetrating radar is by far the most common and useful tool used to scan concrete. It is typically used to find rebar, post-tension cables and other embedded objects. It uses conductivity contrast to find these options.
It is fast and provides instant images, which is why it is so popular. Our non-invasive GPR system can quickly scan a concrete space, finding post-tension cables, conduit and rebar. Ground Penetrating Radar (GPR) is a widely used non-destructive method of scanning concrete. GPR uses pulsed electromagnetic radiation to scan concrete.
The GPR consists of a transmitting antenna and a receiving antenna, as well as a signal processing unit. The GPR emits electromagnetic pulses (radar pulses) with a specific centre frequency to scan the underground environment. The waves reflected by the subsurface layers and objects are picked up by the receiving antenna. We offer a selection of systems for concrete scanning, so that you can choose the one that best suits the needs of your project.
The reflected waves are detected by the receiving antenna on the surface, capturing the objects and recording the individual traces and scans. In the following case study, Proceq's GP8800 ground penetrating radar and Pundit PD8000 ultrasonic pulse-echo array were used to scan a section of a steel fibre reinforced concrete floor, used as a foundation to support machinery with high dynamic loading. Instead of hammering the concrete to discover that it has been dug in the wrong place, concrete scanning takes all the guesswork out of your job, allowing you to work on any concreted area safely. Faster than a concrete x-ray, GPR technology is the best tool for a slab scanning and concrete inspection job.
GPR can scan large areas in one or more displacement images producing a vertical sectional view of the test area much like a hospital MRI. In some cases, X-rays are considered to be more accurate than GPR scanning as there is less scope for interpretation of the results, including visualisation of the condition of rebar and areas of corrosion or other defects. It is good to know that there are non-destructive methods of scanning concrete and ground penetrating radar is one of them. I have been using United Scanning for several years and have never encountered a service during drilling or test pitting activities.
The images and image interpretations are provided in a timely manner and the process of acquiring the information is safe, non-destructive and can be done without significantly disturbing the space being scanned.