Non-Destructive Testing Techniques for Condition Assessment of Reinforced Concrete Overhead Transmission Foundations

Overhead line (OHL) support structures typically rely on shallow reinforced concrete foundations that become difficult inspect once buried, significantly limiting direct inspection and condition assessment. This creates significant uncertainty during refurbishment and life extension activities, often resulting in conservative design assumptions or premature replacement. Support structure concepts that prioritise inspect ability, modularity, and whole life performance therefore present a clear opportunity to reduce risk and improve the long-term sustainability of OHL infrastructure. For lattice towers, foundations are typically embedded at depths of approximately 1.5 – 3 m, depending on soil conditions and loading requirements. Full excavation of these foundations is generally avoided, as…