Ciments Francais

Stephanie Delair

Bruno Le Rolland

Emmanuel Moudilou

Cyril Guerandel

A hydraulic binder based on a sulfoaluminate clinker including the mineralogical phases ye'elimite CA$, mayenite CA, free lime CaO, and optionally belite C2S, characterized in that, in the clinker, the mineralogical phases are 20% to 50% by weight of ye'elimite C4A3$ phase, 5% to 80% by weight of mayenite CAphase, and 1% to 5% by weight of free lime CaO, the weight ratio between the mayenite CAand ye'elimite CA$ phases being between 0.1 and 10. The binder can be used to treat polluted soils, in particular soils with a leachable fraction greater than 0.4% that contains predominantly anions and/or heavy metal cations by mixing the soil with the hydraulic binder, in soil/binder weight proportions of between 1 and 40 parts of binder for 100 parts of soil. It makes it possible to stabilize soils which are polluted or to stabilize soils before dumping.

Sulfoaluminate clinker based hydraulic binder and use thereof in a process for treating polluted soils

A process for treating polluted soils, in particular soils with a leachable fraction greater than 0.4%, wherein the leachable fraction contains predominantly anions, in particular sulfate ions, and/or heavy metals, includes mixing the soil with a sulfoaluminate-clinker-based hydraulic binder, in soil/binder weight proportions of between 1 and 40 parts of binder per 100 parts of soil, the sulfoaluminate clinker containing more than 50% by weight of ye'elimite CAS phase, less than 15% by weight of belite C2S phase, and from 1% to 5% by weight of free lime CaO. The process is used for stabilizing soils in situ or before dumping, soils polluted in particular with sulfate anions and/or heavy metal cations.

Growing community of inventors

Poissy, France

Stephanie Delair