In the near future Europe`s underground construction industry is expected to excavate around 800 million tons of mineral resources from tunnels, metros and other underground constructions like underground powerhouses, sewage tunnels etc. Currently, this excavation material is usually disposed of in landfills. Efficient use and recycling on site or in other industrial sectors is therefore of great economic and environmental interest. This approach would substitute a large amount of primary mineral resources and substantially reduce environmental problems and CO2 emissions involved in landfilling and transport.

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