Cohen, Pontani, Lieberman & Pavane
Hydraulic binder resulting from mixing a sulfate binder and a binder comprising the mineral compound C4A3{overscore (S)}
The present invention relates to a method of preparing a hydraulic binder wherein at least the following two binders are mixed together:a) a first hydraulic binder having as one of its main components the mineral compound C4A3{overscore (S)}; andb) a sulfate second binder based on calcium sulfate hemihydrate and/or anhydrite obtained by applying heat treatment to gypsum.The present invention also provides a binder comprising amongst its main components:a) a mineral compound C4A3{overscore (S)}; andb) a compound comprising a hemihydrate of calcium sulfate of &agr; or &bgr; form and of general formula CaSO4, &frac12;H2O and/or an anhydrite of III form of general formula CaSO4, &egr;H2O with &egr; lying in the range 0 to 0.5, preferably in the range 0.06 to 0.11, or an anhydrite of II form of formula CaSO4.
C
C04B
inventional
Hugues Jean Guanshu
Hornain Couturier Li