Long-term experiences with an asphalt membrane at Agger Dam

摘要

In 1967 the Agger Dam, a 45 m high concrete gravity dam build 1927 to 1929 with 19,300 X 10~3 Mio. m~3 storage, was supplied with a composite sealing made of a 12 cm asphalt membrane and a 28 cm concrete wall. The reinforced concrete covers the asphalt concrete and leads the weight of the new construction to the solid concrete of the old dam by anchorage with 1 meter distance between each other. The leakage rate from the reservoir into the dam drop down to 10 to 20 cm~3/s till today. In 2002 the anchorage plates need a new corrosion protection and the surface of the 1967th concrete has to be rehabilitated. The Aggerverband decided to remove a 1.5 cm concrete layer and supply a 3.0 cm Shot-Polymer-Cement-Concrete (SPCC). After this the Aggerverband expects another lifecycle of at least 30 years of operation for the asphalt membrane.