Concrete Imaging

Sandberg Remains Open During This Challenging Time

Whilst many of our staff are working from home during these unprecedented times, all our activities remain open for business in line with government guidelines. We have adjusted our operations so that staff remain safe. Currently, although we are working at a reduced capacity, we are meeting client demands and are welcoming new enquiries.

Ground penetrating radar (GPR) is regularly applied to examine concrete structures such as walls, floors, columns and bridges. It has recently gained popularity for concrete imaging. GPR’s advantages over more traditional methods such as covermeter and Ferroscan are many:

Greater depth penetration (up to 500mm at high resolution)
Resolve second layer of rebar (subject to spacing)
Determine slab thickness
Detect air voids, conduits and pipes (including plastic), tensioning cables, etc.
Screed does not have to be removed to map rebar in floor slabs
Generally only one sided access required
Capable of depth slice images and 3D models

Historically only X-ray technology created a photographic image of the concrete interior but it required access to both sides of the structure and involved the use of hazardous X-ray sources. The Ferroscan does offer imaging, but this is poor and limited in comparison.

Detailed imaging of reinforcement can be achieved by scanning at close centres on a regular orthogonal grid. The data is processed using specialist software and depth slices or a 3D model of the reinforcement can be produced.

Alternatively, if depth and rebar spacing is required, this information can be shown graphically or exported to a spreadsheet for statistical analysis including contour plotting.

For further information contact: Ewa Krylowicz, GPR Manager
Direct Tel: 020 7565 7056
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