soil cement
 n.— «Soil contaminated with metal is tougher to treat because the metal cannot be broken down. An alternative to using it in industrial landfills is creating what is known as “soil cement.” The metal is immobilized and the soil turned into a hard clay that can be used in roadbeds.» —“Brownfields come clean” by Theresa Boyle Toronto Star (Canada) June 24, 2006. (source: Double-Tongued Dictionary)

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