Salt-concrete

Salt-concrete (or salzbeton) is a construction
material that is used to reduce the water inflow
in mining shafts in salt mines. It is composed of
16% cement , 39% halite, 16% limestone
powder, 14% water and 15% sand. [1]
History
Salt-concrete was used for the first time in 1984
in the Kali mine in Rocanville in Canada . [2] A
salt-concrete seal was also installed in the Asse
II mine in Lower Saxony in 1995. [3]
Filling tunnels
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 m 3 of
saltconcrete has been pumped into the pit to
temporarily stabilize the upper levels. In
addition another 4.000.000 m 3 of saltconcrete
will be used to temporarily stabilize the lower
levels. [4]