“…GPR is a very versatile technique that has been successfully employed in many infrastructure condition assessment and geophysical survey applications . These applications include pavement thickness measurement [16], defect detection in concrete or composite bridge decks [17,25], reinforcing steel location in concrete [22,23,34], archaeological investigation [18,19], detection of landmines [28], snow thickness measurement and/or subglacial topography detailing [27,31], tree root detection [20,21,26], irrigation and soil water content monitoring [36,37], detection of cracks in concrete or pipe walls [24,30], and underground/concrete void detection [29,38]. GPR has also been used for buried container and pipe/utility detection [15,32,33,35], but these applications include the detection of metal pipes or pipes filled with water, which are much easier to detect using GPR compared to non-metallic buried pipes, which may not have water inside it.…”