Hydroabrasionsbeanspruchung von Verkehrswasserbauwerken

Hydroabrasive exposure of hydraulic structures

In the field of waterways engineering concrete surfaces are exposed to hydroabrasion in different intensity (e. g. stilling basin, weir body). A description of the exposure to and the concrete's resistance against hydroabrasion is not included in the current European standard EN 206-1 respectively EN 206. In the German National Application Document (DIN 1045-2) used with EN 206-1 it is only considered rudimentarily. The specific regulations for hydraulic engineering regarding construction (ZTV-W LB 215) and repair (ZTV-W LB 219) refer to the regulations of DIN 1045-2 for exposure of concrete to wear (XM). A research project of the Federal Waterways Engineering and Research Institute in Karlsruhe, in collaboration with different research institutes, pursuits to verify these regulations for concrete constituent materials, concrete mix design and concrete properties to assure a sufficient resistance of the concrete against hydroabrasion. The formulation of a classification in line with the system of exposure classes for concrete exposed to wear according to DIN 1045-2 is an integral part of this project. The following contribution presents the current activities to characterise the exposure to hydroabrasion.