Substitution of natural mineral building materials by substitute building materials in earthworks and civil engineering


  • Legal obligation to recycle (mineral) waste of the highest possible quality (§7 KrWG)
  • Statutory recycling rate for non-hazardous construction and demolition waste of 70 wt.% by 2020 (Section 14 KrWG)


  • Reduction of the consumption of finite primary raw materials and protection of valuable landfill areas.
  • Sustainable use of materials and creation of a closed cycle economy

BUT: Still low acceptance and lack of experience with RC building materials!

Research subject

  1. Further development of large-scale processing methods for the production of defined material groups
  2. Determination of the soil engineering properties of different RC building materials by laboratory tests; comparison with natural building materials
  3. Tests on compactibility with typical compaction equipment used in earth-moving practice -> Derivation of installation recommendations
  4. Checking and, if necessary, adapting the compaction requirements and test methods of the earthworks regulations for RC building materials
  5. Determination of special areas of application for RC building materials (use of substance-specific properties, e.g. the water absorption capacity of porous materials for soil improvement)