| Project Background |
| The investigated area consisted of a
40,000 square foot warehouse constructed of concrete
floor slabs poured at grade. The specified floor
thickness was 5", however, the slab was found to be
cracking at several heavily-used areas, and site
personnel suspected this was due to a concrete thickness
of less than 5". Geo-Graf was retained to perform a
nonintrusive geophysical investigation in an attempt to
delineate potential concrete "thin spots". |
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| Geo-Graf Investigation |
| Geo-Graf performed the investigation utilizing 4
different nonintrusive geophysical delineation
techniques, including Ground Penetrating Radar (GPR). The
collected GPR data was incorporated into a contour map
indicating areas of thin concrete. The GPR data showed
that approximately half of the floor contained a
thickness less than the 5" as specified, with a
margin of error of +/- 0.25". |
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| GPR Data Profile |
| Please Wait as
the image below loads. It is actual radar data from a
concrete slab assessment project collected by Geo-Graf
engineers utilizing a 900 MHz GPR antenna. |
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| Above: A GPR data profile showing a
thin spot of concrete. 900 MHz GPR antenna system. |
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