Examination techniques, which are well known for rock, can also be used for aged porous mass concrete structures. These structures have intensively been used in German waterways for weir systems and river locks in the first half of the 20th century. Due to aging, the maintenance and renovation of these structures are essential, and lasts for several decades. In many cases these structures exceeded their design lifespan. They do not possess the required tightness anymore against seepage flow within the construction material or within its foundation. Additionally, they exhibit damage due to frequent static and dynamic load changes. The rolling-weir gate in the city of Koblenz is one example, for which the investigation and the measures to increase the overall stability are presented.

This content is only available via PDF.
You can access this article if you purchase or spend a download.