Environmental influences and errors during the processing of concrete as a building material often lead to costly damage in structures such as bridges, underground parking garages, and others. These structures are also exposed to various environmental influences such as cold, heat, humidity, and condensation water. Over the years, effects associated with chloride lead to pitting corrosion of the steel used for reinforcing the concrete.
The concrete is therefore checked for chloride content as part of the inspection of the integrity of the affected structures. Drill dust samples are collected from various pre-determined points in the structure, generally from different depths, for chloride content determination.