Building materials are becoming scarce: recycling is rarely used
Gravel, sand and gravel are becoming scarce and more expensive. Recycled building materials could help. But despite sophisticated technology, there are major hurdles, especially in public projects. By Johannes Lenz.
Kies, Sand und Schotter werden knapp und teurer. Recycling-Baustoffe kΓΆnnten helfen. Doch trotz ausgereifter Technik gibt es vor allem bei ΓΆffentlichen Projekten groΓe HΓΌrden. Von Johannes Lenz.