Ground Penetrating Radar or Ground Probing Radar is a nondestructive and non invasive method to investigate subsurface of metallic and non metallic structures such as concrete, rock, soil, ice, pavement, voids, water, cracks and RCC structure.
Some of the uses of ground penetrating radar (GPR) are:
- Inspection of interior structure of new construction for quality assurance control
- Evaluation of existing structure for rehabilitation purposes
- Inspection of members of a structure like a wall, floor, deck, column, and beam etc
- Investigation of tunnel walls, roofs and inverts
- Finding location of rebars, conduits and tension cables
- Finding location of voids and internal cracks in walls and under concrete surface
- Estimating thickness of concrete layers
- Locating metallic and non metallic objects in the subsurface
- Finding position and location of power cables
Why is Ground Penetrating Radar (GPR) used?
Ground Penetrating Radar (GPR) is a non invasive method which supervises, diagnose and investigate the quality of the reinforced concrete without coring or breaking the surface. The property of reinforced concrete and limitations on the testing site interferes and obtains comparatively low quality result in case of other non destructive methods such as ultrasonic testing, pulse-echo testing, and infrared ray testing.
Here are some features of the Ground Penetrating Radar (GPR) result:
- It is accurate and precise
- It is presented in easy to understand formats such as engineering CAD plans, elevations, and section
- Result can be obtained even of the original building plan is not available
- Estimate the quantity and quality of concrete structure
- Displays cracks, voids, rebar position in 2D illustrations
- It can be used to monitor the progression of any internal damage of deterioration
- It can be used as future reference
Ground Penetrating Radar can be adapted for different requirements like surveying, inspection, quality assurance or monitoring. It is possible with its interchangeable antenna units. There are two types of antennas which serve different purposes such as:
- Low-frequency antenna can locate deeply seated voids and large steel elements
- High-frequency antennas are used for locating rebar, tie bar, cable duct, the integrity of brickwork and reinforced concrete, small voids, delamination and other structural defects.
How is it important for bridge inspection?
For years ground penetrating radar has been used to find utilities. Today department of transportations have started to use gpr to inspect bridge decks and bridge approach ways. For the most part companies performing gpr do not provide any actionable data to the bridge asset managers. It was not until companies like Infrastructure Preservation Corporation increased the sensitivity of gpr and its interpretation based on bridge components to provide actionable items that the asset owners can use to properly allocate assets to make repairs in a timely manner.
Ground Penetrating Radar will become an essential part of not just the follow-up inspection but will be integrated into routine inspection. It can easily locate internal defects in less time. If used properly it can determine the thickness of concrete slab and element, find rebar spacing and evaluate the condition of steelwork in the structure. It can also find the zones of water penetration and corrosion progression inside a damaged concrete surface. Timely bridge inspection by using Ground Penetrating Radar (GPR) can save time, money and labor as it can help in prioritizing the repairing needs of the bridge surface and members.
Infrastructure Preservation Corporation (IPC) provides advanced Ground Penetrating Radar (GPR) services from many decades for road and Bridge Inspection. Our efficient and experienced inspection team can inspect any structure in short time and provide accurate condition assessment report of the structure in a provided time frame.
To get a free estimate of our Ground Penetrating Radar (GPR) services, provide your contact details at our site https://www.infrastructurepc.com/. You can also visit our site to know our other services and products in detail.