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Our client needed to core 2 locations in this area. We did some GPR scanning and found clear locations that were clear of steel or other obstructions. One of the locations that were originally planned would have been right on top of a conduit. This is another example of saving money but getting scanning.

In this scan location, we found a high concentration of electrical conduits. The original location of the core was going to pass through two electrical conduits embedded in the slab. This was simple to avoid by moving the location 3 inches to an area clear of any steel or conduits. Call before you dig, and scan before you core.

Ceramics do not inherently affect Ground Penetrating RADAR in a different way than other hard building materials like concrete. What can happen in some cases is that a wire mesh will be placed under the tiles in the grout layer and this creates a faraday cage that will block the signal from above. This effects both GPR and X-ray. However, if the slab is elevated then it can be scanned from the underside. This will show the technician the contents of the slab up to the wire mesh mat layer that is under the tiles. The only case that would not able to be scanned is tile that has the wire mesh layer in the grout and is slab-on-grade or elevated slab with metal pan.

In many cases, a hole needs to be cored through a metal wall track to run electrical conduit for wall boxes. When this happends we will remove the wall track on the floor in the sections the scans are located and scan both sides of the wall. The job from the picture above, we found that the beam stopped just at the edge of the wall, and no steel was running parallel inside the wall. We did locate a run of electrical conduits that ran right through the third section of the wall. This was also the main location that was set to be cored with 4 cores. They just relocated the cores to the second and fourth sections and were able to avoid the electrical conduits all together. This was billed as 3 scans and came out to be about 1/15 of the price of hitting the conduits. In the long run, it is always cheaper to scan.

This is an office building in Charlotte, North Carolina. We were called because they thought there might be posttension cables / pretension cable in the slab on grade as is the case with many buildings located in Charlotte North Carolina. This is a cross-section from the electrical room that was slab on grade although we found no Post tension cables or Pre tension cables. We were able to prevent them from hitting two electrical conduits. Using GPR is a great way to locate and avoid issues before they become an expensive problem to fix.

On this job we located one of the building's main electrical runs going right though zone that was set to be saw cut. This would of cost alot of time and money to repair. Situations like what could of happened can be easily avoided with GPR concrete scanning. #ground_penetrating_radar #concrete_scanning #electrical_conduit #elevated_slab #slab_on_grade

GPR scanning uses the contrasting properties of materials to view layers or objects located inside of those layers. When waves transition from one material to another and a portion of the waves reflect. The amount that reflects is based on the change in dielectric constant. An example of this is an air-filled pvc pipe vs a water-filled pvc pipe. The concrete has a dielectric constant of around 9 - 12 and air being 1 would give a contrast of around 10 and water being 81 would give a contrast of around 71. Both would be visible to the GPR technician however the water-filled pipe would show 7 times brighter on the GPR screen. Metal like that in electrical conduits, PT cable, and rebar have a contrast of 100, this means 100% of the signal is reflected back to the GPR receiver creating very dark pecks. This makes locating objects in a concrete slab a perfect case for GPR.


Like all things in the Charlotte, North Carolina market the GPR scanning
market is seeing massive growth as well. Many more building managers and owners are requiring it. This is due to three main factors. The reduced risk of damage done to structural elements like that of PT cable. The increased safety of those who are cutting, coring, or drilling by avoiding electrical conduit. The quality of the experience for the clients, no one wants to lose power to their office for a week due to the remodel going on one floor above. Because of these things stacked alongside the overall growth of the commercial market we have seen a significant increase in inquires for GPR from the Charlotte, North Carolina region.

Concrete scanning of an elevated slab leaves a very clear image for GPR as we can see the bottom of the slab and everything in between. The only thing we can not see doing concrete scanning is directly under steel like rebar. This is why we recommend on all concrete scanning jobs to not drill, cut, or core on our lines. If a conduit is directly under rebar our system would not be able to detect it. However the clear space between our lines are 100% risk free and guaranteed by us as safe to drill, cut, or core.

Our Goal at Xenogenesis RADAR is to help you hit nothing but concrete. We try to help our customers avoid all Rebar, Conduits, PT, Beams, and Anchors. Some times there just is no clear location and moving the hole over a foot in another direction is not an option. In these cases, we try to help you pick the safest option available. In the picture above there was not a good option to avoid all contents of the concrete slab, so the technician would choose the clearest example of rebar and make a recommendation of where to core.

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