For over 50 years, asphalt concrete has been used as a specialist method of constructing an impermeable central core liner to seal large embankment dams. Today there are over 140 such dams around the world with a perfect no-leakage record.
Extensive technological research and development of modern specialized machinery as our recently developed Asphalt Core Paver have amplified interest in WALO’s Asphalt Concrete Core (ACC) Embankment Dams solution and positioned WALO as the world-wide leader.
Why use DAC to construct a core for an earth embankment dam?
The construction of a watertight membrane using DAC, in the axis of the embankment, is made simultaneously with the earthworks. The asphalt and the materials for the adjacent transition layers are placed into a core finisher – a highly sophisticated, technologically advanced machine specially developed for this task by our engineers.
The core finisher travels along the embankment axis and applies both the asphaltic concrete core and the two transition layers (also called ‘filter zones’) in the center of the structure. The asphalt layers are 8 – 10 inch (200 – 250 mm) thick and are heated using infra-red heating appliances, enabling them to be perfectly sealed. The core finisher applies the initial compaction to both the asphalt core and the filter zones, and vibrating rollers do the finishing works.
To ensure consistent quality standards, the WALO laboratory regularly makes on-site checks of all materials.
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