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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.

This Ground Penetrating RADAR (GPR) Scan was for a floor box. The area was scanned and the box was able to be relocated to avoid any damages to the surrounding conduits. This saved alot of money and headache for the client as well as being much safer for the coring company that would of been coring the hole.

This outdoor Slab on grade job took an unusual turn. The slab was about 20 feet by 30 feet. We needed to locate the depth of the slab and if there was rebar and if so the spacing. This patio slab held two storage tanks. My guess would have been 6 to 8 inches and wire mesh. So we took out the 2600 Mhz rig and start rolling and can't see the bottom of the slab, so we moved to a 1600 Mhz, 900mhz and then finally on the 400 Mhz antenna we found the bottom of this small slab on grade area at over 3 feet deep and rebar 1 foot on center 15 inches deep. This is deeper than footers I have seen in large hospital buildings. My guess for each tank would be somewhere between 4 to 6 tones. My guess for the strength of the concrete slab supporting them 13,500 to 27,000 tones. So to the question at hand, will it hold the added weight of a new tank? It should do an ok job at supporting the weight for the next 100,000 years or so.

Ground Penetrating RADAR (GPR) can locate voids or anchors in concrete slabs. By mapping out the rebar mat and scanning the areas in between you can identify any anchors that may be present. GPR can also get an accurate thickness of the slab. Because of this concrete beams can easily be located and avoided.

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.

GPR Viewer from www.gpr-archaeology.com is one of the best tools for viewing GPR data. This is a FREE tool made by Lawrence B. Conyers. When compared with options like RADAN 7 offered by GSSI it may be lacking features, but when you are talking free vs $4000 per computer it's an amazing solution. I have used GprViewer many times for large and small projects even on occasion over RADAN 7 of with we have a full copy. When I am having issues interpreting the data I am looking at throwing some passes in GprViewer and taking a better look has saved me more than a few times. One of my personal favorite features is how it handles gain. You can vary the gain at different depths and get a clearer picture of what is going on. I would love to see this ported to Android or IOS for use on a tablet, but being as this is a free program that would be a value option at several hundred dollars you really can't complain.

The ground penetrating radar (GPR) market is expected to grow from USD 493 million by 2019 to USD 726 million by 2024 at a CAGR of 8.1% from 2019 to 2024

Safety concerns and the protection of underground utilities are a large segment of the growing market, as well as evaluating aging infrastructures such as highways and bridges. The advantages of GPR over other traditional destructive technologies such as taking core samples, and government support for the implementation of GPR are among the key factors driving the market growth.

Although Europe is representing 50% of the total GPR market it is expected that the US market will be catching up as more high-value lines such as fiber become more prevalent.

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 Ground Penetrating Radar - Archaeology - GPR - GPR Concrete Scanning - Geophysical Survey - Structural Analysis  - gpr concrete scanning

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