Abstract
The usefulness of Ground Penetrating Radar (GPR) for examining areas of deterioration in bridge decks was tested in Finland, with the aim of assessing whether the method can be used to estimate pavement thickness, deterioration of the protective concrete and slab and damage to the water-proofing. Some tests were also performed to locate cracks in the slab. The surveys were performed using ground-coupled dipole «bow-tie» antennae with frequencies of 900 MHz, 1.0 GHz and 1.5 GHz, and 2.5 GHz TEM horn antennae were also tested. The measured GPR data were compared with information obtained from drill cores and damage mapping during repair of the bridges. The results show that GPR can be used to map areas of deterioration in bridge decks
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