It is composed of 16% cement, 39% halite, 16% limestone powder, 14% water and 15% sand.
[1] Salt-concrete was used for the first time in 1984 in the potash mine in Rocanville in Canada.
[2] A salt-concrete seal was also installed in the Asse II mine in Lower Saxony in 1995.
[3] Since the end of the repository for radioactive waste Morsleben in 1998, the salt dome stability deteriorated to a state where it could collapse.
Since 2003, a volume of 480,000 m3 of salt-concrete has been pumped into the pit to temporarily stabilize the upper levels.