Sample GPR Profile Showing Detected Rebar and Other Subsurface Features

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Applications:

During construction, repair, and modification of concrete structures there is commonly a need to evaluate, verify and locate specific features inside the concrete slab. AGS specializes in providing non-destructive concrete evaluation and imaging services utilizing highly experienced geophysicists and the latest Ground Penetrating
Radar instrumentation to:

· Examine the structural integrity of roads, bridges and buildings

· Verify construction specifications

· Locate and map re-bar

· Locate and map pre-stressed members

· Determine slab thicknesses when only one side of structure can be accessed

· Clear boring locations

· Identify voids and honeycombs in walls and slabs

· Determine success of void grouting

· Map utility chases in building walls

· Identify penetrative cracks

Post Tension Tendon Survey

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Concrete Services

Advanced Geological Services

Providing Comprehensive Geophysical Solutions

Information:

Since its inception, AGS has specialized in non-destructive testing of concrete structures.  AGS maintains both 1 GigaHertz (GHz) and 1.5 GHz antennas to provide finely detailed images of subsurface features. The real-time results provided by GPR methods are ideal for rapid turn-around and flexibility required during concrete coring operations.  Experienced post-graduate level geophysicists are provided on-site for data acquisition and interpretation to ensure accurate and insightful analysis and interpretation of GPR responses.  In addition to performing a real-time mark out of rebar, tension cables, and conduits during active construction, AGS can provide overlays to existing AutoCAD plot plans identifying and documenting additional object locations and depths.

Advantages:

GPR signals do not penetrate metal, therefore access to the opposite side of a wall or floor (i.e. lower level ceiling) may be required to identify features beneath or behind metal sheeting or a closely spaced metal mesh.  Access to both sides of a wall or floor may also be required when there is an upper and lower level of re-bar.

Limitations:

Concrete evaluation using GPR methods provides data acquisition flexibility, high-resolution visual data and realtime results. Data can be collected allowing minimal disruption of normal site activities, in locations such as active and/or operating hospitals, universities, shopping malls or office buildings. In addition, unlike conventional ultrasound and x-ray methods, data collection only requires access to one side of the concrete slab or wall to be imaged.