Concrete Scanners

Concrete Scanning for Non-destructive Concrete Investigations.

What is concrete scanning

Concrete scanning is a non-destructive testing method used to assess and locate objects embedded within concrete structures. This technique employs various technologies such as Ground Penetrating Radar (GPR) or electromagnetic scanners to detect and visualise the presence of reinforcing bars, conduits, post-tension cables, and other subsurface features without causing damage to the concrete.

Concrete scanning is commonly employed in construction and civil engineering projects to ensure the structural integrity of buildings, bridges, and other concrete structures. It aids in avoiding accidental damage to hidden elements during renovations, drilling, or cutting activities, enhancing safety and minimising the risk of structural compromise. The information obtained through concrete scanning allows project managers and engineers to make informed decisions and plan construction or maintenance activities more effectively.

We offer concrete scanning in Auckland and throughout all New Zealand

Equipped with advanced Ground Penetrating Radar (GPR) and ultrasonic scanners, we excel in non-destructively detecting and visualising subsurface elements within concrete structures.

Whether you’re embarking on construction, renovation, or maintenance projects, our experienced team ensures the structural integrity of your buildings and bridges. By leveraging cutting-edge technology, we mitigate risks and minimise the potential for accidental damage to vital structural components, empowering you to execute projects with trust.

Discover our range of scanners we use for concrete scanning

Our team use a variety of tools to further investigate void depth, utilities and steel reinforcement in concrete. For example, the Ground Penetrating Radar (GPR) can be used to accurately locate steel reinforcement.

GPR is a rapid, cost-effective and 100% non-intrusive method. GPR can help inspectors and engineers verify the as-built reinforcement, identify top and bottom rebar locations (i.e. in slabs, and walls), and find the configuration of transverse reinforcement. 

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For example, if structural engineers need to verify the spacing of the reinforcement in the potential plastic hinging zone, GPR can help verify the spacing of the stirrups. GPR can also be used to identify the amount of concrete cover over the reinforcement. Additionally, the use of a Ferroscanner verifies concrete cover and identifies ties in brick walls.

Another important group of tests is ultrasonic testing of concrete. Ultrasonic methods, such as Ultrasonic Pulse Echo can be used to predict the thickness of concrete elements with one-side access. Ultrasonic Pulse Echo can also be used for determination of grout fill of Drossbachs, ReidBar Grout Sleeves and Post-tension (PT) Ducts. The Ultrasonic Device and GPR can be used to identify voids in concrete.

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The 900Mhz GSSI antenna/scanner has capability to scan for large voids and reinforcement up to 1m depth.

concrete scanning NDT

The GSSI Bridge Scan Radar is useful for detecting deterioration of reinforcement in bridge and wharf decks over large areas. The Bridge Scan Radar can produce a cover survey of reinforcement for Quality Assurance.

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Looking for a quote from our specialist team?

Get in touch today via our non-obligation estimate form below. We’ll be able to help you out with the information you need.

Request Estimate


Some of our Projects

Grand Millennium Anchor Testing

November 3rd, 2022

Read along to find out more about the latest Anchor Testing Project that we completed for our special clients; Hospitality […]

Britomart Tunnel Easter Shutdown Works

May 26th, 2022

Over the Easter break, the Directors at CSI have been working hard in the Britomart Tunnels to provide effective service […]

Paying Attention to Deep Reflections using GPR

March 2nd, 2022

PROJECT REQUIREMENTS To help construct an extra ICU space in a hospital, sinks had to be added.  This required coring […]


Kurtis and his team showed highly skilled reading of scan results. These allowed them to be the only ones who successfully located the defects (random voids) in Polystyrene blocks filled with concrete and lined with Gib in a prepared area...

Maynard Marks

Engaging CSI to conduct the Pile Integrity Testing on the large 1.8m diameter piles was a wise choice. Their technicians were knowledgeable, approachable, punctual, health and safety conscious and flexible when we encountered late changes to the works programme. Results...

Fulton Hogan

As requested, the workers from CSI ltd contacted this office on arrival at the site and invited me (Kevin J Heays) to site visit and get an understanding of the intended works. I was impressed with the workers knowledge of...

Kevin Heays (ECANZ)

The CSI team were great and they did a good job for us. They were employed to complete QA on a Wellington Apartment Development using Pile Integrity Testing. We would recommend CSI to others in the future.

Richardson Drilling

CSI did a good job for us at an Auckland Apartment building; saving our team from drilling through services which would have caused considerable delays. We would recommend CSI to others for scanning

Allendale Electrical

CSI provided a great service. We could not advise them on areas of improvement as their service was highly professional.

Wilson Building

We found CSI via their website and were grateful that we had. Their service was highly professional.

Artisan Developments Ltd

CSI have completed several jobs for us. They are highly skilled operators.

Tracer Construction

CSI was recommended by a health board, and they did a great job for Q Interiors. We are already looking at employing them for future work.

Q Interiors

The service and follow-up of CSI Ltd was excellent. We would definitely use them again.

Grayburn Property Service

CSI Ltd did a great job for us. When we were asked what improvements could be made, we could think of no gaps in their professional service.

Trademark Building Services

CSI Ltd were recommended to us and did a great job. We would be happy to recommend them to others.

Stanley Construction

We were recommended CSI by an Engineer and he was absolutely correct; their GM particularly communicated well and was highly professional.

MSC Consulting Group

CSI has completed some exciting projects with Novare Design “I am very impressed at the responsiveness, relevance and accuracy of the testing and data supplied to Novare for some recent strengthening projects. We have worked with CSI on several projects...

Novare Design

Darren, Ali and the team at CSI have been a great help at the Oaks Shores refurbishment project. CSI was willing to work through the difficulties of travel under various Covid-19 levels, ensuring they could be of assistance in Queenstown...

Brosnan Construction