Fig. 1
From: Inspecting the corrosion state of underground reinforced concrete structures
Current inspection methods for RC retaining walls. The corrosion damage is marked in red at the backside of the wall: A Excavation of backfill, followed by concrete cover removal and visual inspection of the corrosion state from the backside; B Removal of concrete with hydro-jetting and visual inspection of the corrosion damage from the front side; C Extraction of drilling cores from the front side for analysis in the laboratory