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Finger on the pulse Advances in impulse radar technology are opening up new possibilities in concrete investigation. Dave Parker looks at a new Concrete Society guide, and reports on one company's rec

Ground penetrating radar was first used to investigate concrete structures more than 25 years ago, initially to look for voids under concrete footpaths. The basic principles have remained largely unchanged, even though there have been massive advances in associated technology such as control systems and software, and in the understanding of how electromagnetic pulses behave inside concrete elements.

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