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GPR Concrete Scanning and False Peaks

In GPR Concrete Scanning context and experience is very important. Knowing what peaks are the steel you are looking for and what peaks to ignore. GPR reads the contrast of materials ie (the difference in relative dielectric constant) It is not just looking for metal objects. The reason GPR is used to locate metal in so many applications is that metal is 100 on the dielectric scale where most concrete falls between 4 to 12 with even very green concrete no going to much past that point. This means the contrast is always going to be massive. Air is 1 on the dielectric scale and water is an 80 this is important because there is about the same change in the dielectric constant going from concrete to metal as there is in air to water. In the picture above there are two rebar ties(green) and an expansion joint(red). This data was collected on a rainy day and the join had collected some runoff. This made each joint we passed leave a strong hyperbola. There are lots of other causes for "false peaks" but with experience they become easy to spot.

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