Saltcrete

Saltcrete is a mixture of cement with salts and
brine , usually originating from liquid waste
treatment plants. Its role is to immobilize
hazardous waste and in some cases lower-level
radioactive waste in the form of solid material.
It is a form of mixed waste.
Saltcrete is being replaced by saltstone , which
is less permeable and leachable. Saltstone is a
mixture of the salt cake (mostly sodium nitrate
and other salts) with concrete and fly ash.