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GEORADAR DETECTION – OUR CONCRETE SCAN SERVICES
Ground Penetrating Radar uses electromagnetic wave propagation to visualize and identify changes in the electrical and magnetic properties of the ground. GPR systems are used to locate underground utility lines, concrete reinforcement and post-tensioning, structural integrity monitoring of aircraft runways, groundwater surveys, unexploded landmine detection, forensic research, and land surveying for construction purposes.
We apply the GPR technique for locating public infrastructure to ensure that construction work does not damage underground infrastructure.
What is Ground Penetrating Radar?
Ground Penetrating Radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This non-destructive method uses electromagnetic energy in the microwave band (UHF/VHF frequencies) of the radio spectrum and detects signals reflected from underground structures.
Ground Penetrating Radar uses several high-frequency radio waves, typically in the 10 MHz to 2.6 GHz range. A GPR transmitter emits electromagnetic energy into the ground. When the energy encounters a buried object or a boundary between materials with different dielectric constants, some of the propagated energy is reflected or refracted back to the surface.
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GPR Procedure
Ground Penetrating Radar (GPR) works by sending a tiny pulse of energy into a material and recording the intensity and time it takes for any reflected signal to return. A series of pulses over the same area is called a scan. Reflections occur when the energy pulse enters a material that has different electrical conduction properties or dielectric permittivity than the material it left.
The intensity, or amplitude, of the reflection is determined by the contrast between the dielectric constants and conductivities of the two materials. While some of the energy pulse from the GPR is reflected to the antenna, the energy also continues to move through the material until it dissipates (attenuates) or the GPR control unit has closed its time window. The rate of signal attenuation is highly variable and depends on the properties of the material through which the pulse travels.
What is the Depth Level?
This is probably one of the most frequently asked questions. In most cases, the depth can be accurately estimated based on the surface material and the frequency of the ground penetrating radar antenna. For applications requiring higher resolution, such as locating rebar or conduits in concrete, a higher frequency (1000 MHz) ground-penetrating radar system is used.
This provides high resolution detail to a depth of approximately 24 inches. Applications that require deeper soil penetration require a lower frequency (12.5 MHz to 500 MHz). Depending on the subsurface material, the depth can range from a few inches to thousands of feet (as shown in the table).
GEORADAR DETECTION ALLOWS YOU TO
SAVE TIME
SAVE MONEY
MANAGE RISKS
BUILD YOUR REPUTATION
AVOID DISASTERS DURING SAWING AND DRILLING OF CONCRETE
Ground Penetrating Radar detection services quickly and accurately locate cracks, objects, and other hazards in concrete structures and other environments using secure radar capabilities before the ground is broken. Bridges, walls, dams, and all concrete structures are difficult to inspect due to their impenetrable qualities.
Avoid Damage Before Excavation
Locating obstructions buried beneath the surface of concrete and other substances can prevent hazards and keep project operations from running into obstacles. Before cutting, drilling, or coring a surface, it helps to know what underneath with Georadar Detection’s ground-penetrating detection services is.
Georadar Detection is an expert in the inspection, testing and evaluation of concrete structures. Because we are engineers, we understand the impact of structural behavior on test area selection. We are also experts in concrete durability, so we know how exposure and structure interact and what is critical to service life.
Concrete placement inspection and concrete testing to verify compliance with project plans and specifications. Concrete testing includes slump, air content, temperature, yield, unit weight, water-cement ratio, in addition to casting concrete cylinders for compressive and flexural strength.
The main disadvantage of using X-rays to find underground utilities is that it requires access to both sides of the concrete, since one side must receive the radioactive material while the film is positioned on the other side. This restriction generally limits the use of X-ray to elevated slabs. The GPR only requires access to one side of the concrete, so you can use it for concrete slabs on grade where the concrete has been poured directly on the ground.
The GPR itself does not identify the specific material inside the concrete, so technicians must use other data to determine if the internal structure is rebar or conduit. This process typically involves marking the location of each anomaly and studying the resulting pattern to determine what each mark indicates.
For example, a series of anomalies spaced 12 to 18 inches apart is most likely rebar, while more evenly spaced anomalies are likely post-tensioning cables. Anomalies that form an angle with the slab are usually conduits, depending on whether the images show bands or a uniform consistency.
Securing Your Projects
UNDERGROUND DETECTION
Detection of underground services is an integral part of project planning and is essential before any construction or excavation activity begins. Using a range of electromagnetic and penetrating radar equipment, Georadar Detection’s experienced team will locate, identify, and map your underground services and assets.
Our services include:
- Cable detection
- Clearance of monitoring well and borehole locations prior to drilling
- Brief detection report with photos of identified services
- Detection and surveying of services for design purposes
- Marking of identified services with surface spray paint or painted stakes
- Survey drawing in CAD format
- Pipe detection
- Clearing trench positions for various construction applications
- Other services
Our line of underground detection locators can easily locate buried cables, pipes, telecom cables, and most services and utilities more accurately and quickly than ever before, minimizing the risk of property and personal damage from unseen hazards such as underground cables and pipes.
OUR SERVICES APPLY TO THE FOLLOWING SECTORS
Commercial
Industrial
Institutional
Residential
Underground Tank Detection
Underground storage tanks (USTs), such as steel fuel tanks, or buried drums can be detected using a range of geophysical tools including ground penetrating radar, metal detection, magnetometers, line tracing, time domain electromagnetic conductivity.
Whether you are looking to add wells or other buried infrastructure to your property or need help locating old tank excavations, we are here to help. We provide professional GPR underground tank detection services. We work with a wide variety of professionals and organizations, from structural engineers to contractors to utility companies.
Corrosion Detection Services
Georadar Detection’s technical capabilities have been developed over decades of providing specialized technical support to the power industry. In the area of concrete corrosion assessment, we offer comprehensive services to evaluate the root cause of failures, and test corrosion variables to determine and predict future component life.
Our advanced testing methodologies can simulate system conditions or in-service corrosion degradation mechanisms. Tests can be conducted in an accelerated mode to provide rapid results. The studies aim to provide a practical model of in-service corrosion and data to optimize facility maintenance strategies for any building.
Why is GPR detection essential?
Service providers need to integrate seamlessly into their clients’ workflow and project management, especially for large projects. In fact, they can gain a competitive advantage by offering ways to reduce the time and money spent on large project processes. For example, real-time evaluation of scan results by off-site reviewers can reduce the time between scanning and cutting, often avoiding a second site visit.
What is the best-case scenario when you unintentionally hit an underground hazard? Maybe you spend a few hours reporting and resolving the problem. Maybe a public service is interrupted. In the worst-case scenario, people are seriously or even fatally injured.
A collision with a live conduit, for example, can result in electrocution. A post-tensioning cable can break and endanger contractors and crew members. The fact is, there are many things that can go wrong if you don’t take the time to do a concrete sweep. A safe job site is job one.
If one has never used digitizing services, one may think that digitizing concrete is simply an additional cost for a project. Digitizing can save a lot of money! By having a clear picture of the proposed cut, core, or trench area, you are no longer guessing.
This represents a significant financial benefit by avoiding the additional repairs and services that result from hitting an underground object. As mentioned earlier, concrete sweeping helps your projects stay on schedule. A project that falls behind schedule can cost more.
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