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Reinforced concrete corrosion mapping

The corrosion of reinforcement within concrete structures or more specifically moisture/chemical induced corrosion of the steel reinforcing leads to concrete delamination and, if left unchecked, total structural failure. This is a major problem throughout the world, especially with regards to bridge decks and carparks where salts are interduce into the concrete.

historically, there was no decent method of undertaking the inspection and mapping of corrosion within a concrete structure. Regular methods of corrosion mapping involved half-cell mapping or chain drags, both of which require the top of the slab to be removed and more intrusive works. GPR allows the mapping of corrosion activity quickly, accurately and is totally non-intrusive. We can scan the structures through existing surface finishes and can even be undertaken at traffic speed.

In the past using GPR to analyses the presence of corrosion was inaccurate and utilised automatic analysis of the data. This automatic analysis did not consider the complexities of the structure, often resulting in poor or erroneous results. GPR Pro undertake the data analyses utilising the latest method, visual analysis by trained staff, to assess the data to provide accurate results.

Our survey teams can scan the structure using high-frequency GPR, this data is then post-processed to determine the presence of corrosion. Once processed we provide a map of the structure showing the areas of corrosion, possible/minor corrosion and clean concrete.

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