Ultra-light mineral foam
AssigneeHolcim Technology Ltd
InventorsCorinne Neyrand, Florent Dalas, Mélanie Dykman, Patrick Tintiller, Serge Sabio
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Abstract
A process for the production of a mineral foam includes (i) separately preparing a slurry of cement and an aqueous foam, wherein the cement slurry includes water and Portland cement; (ii) contacting the slurry of cement with the aqueous foam to obtain a slurry of foamed cement; (iii) adding a magnesium salt source before, during or after step (ii); and (iv) casting the slurry of foamed cement and leave it to set.
Claims22
A process for the production of a mineral foam comprising the following steps:
- (i) separately preparing a slurry of cement and an aqueous foam that does not contain a magnesium salt source as an accelerator, wherein the cement slurry comprises water and Portland cement;
- (ii) contacting the slurry of cement with the aqueous foam to obtain a slurry of foamed cement;
- (iii) adding a magnesium salt source as an accelerator during or after step (ii);
- (iv) casting the slurry of foamed cement and leave it to set, wherein the mineral foam is substantially free of particles with a mean diameter D50<2 μm, wherein magnesium chloride (MgCl2) and/or magnesium sulfate (MgSO4) and/or magnesium nitrate (Mg(NO3)2) are used as said magnesium salt source.
A method comprising utilizing a magnesium salt source for enhancing the mechanical stability and/or reducing the collapse of a slurry of foamed cement, the magnesium salt source being magnesium chloride and/or magnesium sulfate (MgSO4) and/or magnesium nitrate (Mg(NO3)2), said slurry of foamed cement being obtained by
- (i) separately preparing a slurry of cement and an aqueous foam that does not contain an magnesium salt source as an accelerator, wherein the cement slurry comprises water and Portland cement;
- (ii) contacting the slurry of cement with the aqueous foam to obtain a slurry of foamed cement, and
- (iii) adding a magnesium salt source as an accelerator during or after step (ii).
Dependencies are inferred from the claim text.