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Why does Ground Penetrating RADAR (GPR) work so well for Concrete Scanning

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.

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