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The most important quality of our service is that we can isolate the hazards in your concrete and find you a safe place to cut or drill.
Ground Penetrating Radar (GPR) can be utilized to image both concrete slabs and walls.
The NDT team at DCSS can help you locate and map the positions of rebar, Post-Tensioned cables, conduit, and other near-surface anomalies before they lead to catastrophe. We will give you a safe place to drill!
Above is small part of a Post-Tensioned shop drawing showing the elevator core and detailing the numerous Post-Tensioned cable tie-in points to the corners of the elevator shaft. In the top left of the drawing are 26 PT Cables that are anchored on one corner of the main elevator shaft. It is at this location that our client wished to create a cutout for a piece of mechanical equipment. Below are the results of our scans.
Directly Above is a GPR image of the banded cables detailed in the Post-Tensioned shop drawings (above).
Above is a Ferroscan image of the same area scanned with the Radar. The Ferroscan is a tool that Digital Concrete uses on a daily basis. The Ferroscan displays its results as a 2D image which shows how the Post-Tensioned cables spread out near their anchorage zone. Digital Concrete is the world expert in the application of both the Ferroscan and GPR in the construction environment.
Above is the area that was imaged using the GPR and Ferroscan (seen in the images above). It is a column anchorage area for 26 Post-Tensioned cables (detailed in the PT Shop Drawings above). The client had originally wanted to create a 8" x 20" cutout right in the middle of the large area of banded cables. This would have led to a catastrophic loss of support within the structure. Destruction in this area of the slab would be extremely difficult to repair.
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GPR can accurately locate metallic and non-metallic reinforcement and pipes in and below concrete slabs.
In addition, GPR can detect flaws in concrete structures. We have experience in detecting the absence of grout in concrete block walls, and missing rebar. We can verify slab thickness and determine the depth of material cover on reinforcement. GPR technology uses high frequency electromagnetic waves. The wavelength is typically between 400 - 1500 MHz. These reflected waves are then detected by the radar equipment and allow us to determine the locations of objects within the concrete.
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