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GPR Scanning & Imaging

Are you confident that you know what is within your structure?

What is GPR?

Principal:

GPR is an acronym for Ground Penetrating Radar.
GPR technology uses high frequency electromagnetic waves.
These reflected waves are then detected by the radar equipment and allows us to determine the locations of objects within the structure. 
Ground can be soil, rock, concrete, asphalt, wood, any substance non-metallic.

Data Accumulation:

The radar unit emits and receives reflected signals up to a thousand times per second.
These signals are viewed by the field operator on site and an immediate analysis is performed.
The data can be collected in simple line or grid format.
Cobra does both of these scan types at every location.
The grid scan format will produce a map of any targets or flaws located in the concrete. This is then mapped out by the operator and they will transfer the data to the grid which is left behind for the clients to review the findings.
Using this method, both the line scan and grid scan, we can see virtual slices in the image to determine the depth and sometimes an estimated size of the object.
The data is then downloaded to a computer and stored for further data analysis if required.
A 3D image of the data can also be created for engineering purposes.
All data is required by law to be kept on file for 7 years.

GPR Data Analysis:

GPR travels through many different materials. Different types of concrete, asphalt and fill material may have varying amounts of water saturation and this will have different dielectric and conductive properties which will effect the GPR waves.
After freshly poured concrete, it is recommended to wait 1 month after it has cured to perform scanning.




















The most important quality of  concrete scanning is to isolate the hazards in your concrete and find you a safe place to cut or drill.

Why Scan?

Safety when cutting or coring
• cutting a gas line can be fatal
• cost future work
• project delays
• be extremely costly

Structural Integrity
• severing a post-tension cable can
  be dangerous and compromise
• structural engineers often prefer
  you avoid rebar

GPR can accurately detect metallic and non-metallic reinforcement, pipes and current carrying electrical in and below slabs up to a limited depth. GPR can also detect flaws and voids, the absence of mortar in concrete block walls, map rebar, post tension cable and pipe. We can verify slab thickness, determine the depth and size of the object in most cases.
GPR vs Radiography

 Facts

 GPR

 Radiography

 Transmission  radio waves  gamma rays
 Radiation
 hazard
 yes  no
 Evacuate
 people
 no  yes
 Need access
 to both sides
 no  yes
 Consumables   no  yes                 
 Licence
 required
 no  yes                 
 Interference
 during business
 hours
 no  yes
 Slab on grade  yes  no
 Walls on grade  yes  no
 On site results  yes                  no
 Determine
 depth
 yes 30"  with calculation 
 16" depth
 Large scan
 areas
 continuous
 8' x 8'
 multiple exposes
 16" x 16"
 Cost  less expensive  most expensive
 Persons
 required
 1  multiple, 2 for
 x-ray & security
 to block all
 entrances to area
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