Mapping Voids Below Reinforced Concrete

Voids beneath reinforced concrete can develop from various factors, such as soil settlement, erosion, or poor construction practices. These voids may compromise the structural integrity of the concrete, leading to reduced load-bearing capacity, cracking, or even failure in extreme cases. Addressing these voids is crucial to maintaining the safety and longevity of reinforced concrete structures, as undetected or unaddressed voids can result in costly repairs and potential hazards.

At TRACE-SI, we use the latest equipment and methods for finding voids below reinforced concrete. Our team of experts is trained in several non-intrusive techniques and can provide detailed and accurate information about the subsurface. We are committed to providing our clients with the best service and results possible. In addition, we offer a range of non-destructive testing services to meet the specific needs of our clients.

Typically, the reinforced concrete surface is scanned with a GPR antenna, high-frequency electromagnetic waves are emitted into the ground and reflected back when they encounter a void. The GPR data is then analysed to create an image of the subsurface, allowing engineers and contractors to identify and address voids, ensuring the structural integrity of the reinforced concrete.

However, in some cases, GPR may not be suitable for mapping voids, especially when the concrete is thicker than what GPR can cope with or contains steel fibre reinforcement, which GPR cannot see through. In these cases, ultrasonic arrays can be used to map voiding. Ultrasonic arrays work by transmitting high-frequency sound waves through the concrete and measuring the time it takes for the waves to bounce back. This allows for the detection of voids in thicker concrete and steel fibre reinforced concrete that GPR cannot penetrate.

Ultrasonic arrays can also be used in combination with GPR for even more accurate results. By utilising both techniques, engineers and contractors can gain a better understanding of the subsurface and address any voids that may be present, ensuring the structural integrity of the reinforced concrete.

Adding geospatial data to the system can further enhance the analysis of the subsurface. By incorporating geospatial data such as GPS or local coordinates and elevation data, the location and depth to the voids can be accurately determined and visualised in a 3D model, improving the accuracy and efficiency of mapping voids below reinforced concrete.

In conclusion, mapping voids below reinforced concrete is an essential task to ensure the safety and longevity of a structure. GPR and ultrasonic arrays are valuable techniques that can be used to identify and map voids below reinforced concrete. Adding geospatial data to the system can further enhance the analysis of the subsurface. At TRACE-SI, we use the latest equipment and methods for non-destructive testing to provide our clients with accurate and efficient results. Contact us today to learn more about our services and how we can help you map voids below reinforced concrete