Investigation of sealing possibilities under consideration of the requirements according to RiStWag


Requirements for mineral sealing materials according to RiStWag with regard to permittivity:

ψ < 1 x 10-7 1/s (~k < 10-9 m/s)

in the event of unfavourable events, such as

  • desiccation
  • saline penetration
  • chemical changes due to cation exchange of sodium bentonite in calcium carbonate (for geosynthetic clay liner GTD)


Investigation of different sealing options

  • Geosynthetic clay liner - GTD
  • Geosynthetic swelling nonwoven fabric


Laboratory tests:

  • Dry-wet exchange test
  • freeze-thaw test
  • Determination of permittivity