Hydroabrasive Exposure and Concrete Resistance against Abrasion Erosion

摘要

Hydraulic structures like weirs or locks can be exposed to a severe hydro-abrasive exposure caused by waterborne particles. In Germany currently about 10 percent of the weirs under the responsibility of the Federal Ministry of Transport and Digital Infrastructure reveal damages caused by hydro-abrasive exposure which impair the serviceability or load-bearing capacity. Unlike as for other exposure such as freeze-thaw attack there are no regulations in European standards which give requirements to assure a sufficient durability against hydro-abrasive exposure. For this reason, the Federal Waterways Engineering and Research Institute has initiated a research project with the aim to describe and classify the exposure of hydro-abrasive attack on concrete structures. Concrete requirements to assure a sufficient durability are to be developed. The paper presents investigations on the hydro-abrasive exposure of hydraulic structures with abrasion erosion damages. Flow velocities and abrasive loads are considered to comprehend the damages and to evaluate the intensity of the hydro-abrasive attack. Results of laboratory tests with the method according to ASTM C1138, the Bania-method and a new test method are presented focusing on the influence of the intensity of the test methods and the influence of aggregate properties on the abrasion resistance of concrete.