Cement board
AssigneeSaint-Gobain Placo
InventorsSonia NAIDU, Luc NICOLEAU
Life of this patent
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Abstract
A cement board includes a lightweight core between a first covering layer and a second covering layer, wherein the lightweight core results from the curing of an aqueous cementitious composition including, based on the total dry matter, 20 to 90 wt % of a reactive binder mixture and 10 to 80 wt % of fillers, wherein the reactive binder mixture includes, based on the total dry matter of the reactive binder mixture: 15 to 25 wt % hydraulic cement, 50 to 65 wt % calcium sulphate hemihydrate, and 10 to 35 wt % pozzolanic material; and at least one of the first and second covering layers includes a glass fibre-based sheeting, the sheeting being fully or partially embedded in a cementitious matrix.
Claims17
A cement board comprising a lightweight core between a first covering layer and a second covering layer, wherein the lightweight core results from the curing of an aqueous cementitious composition comprising, based on the total dry matter, 20 to 90 wt % of a reactive binder mixture and 10 to 80 wt % of fillers, wherein said reactive binder mixture comprises, based on the total dry matter of the reactive binder mixture:
- 15 to 25 wt % hydraulic cement,
- 50 to 65 wt % calcium sulphate hemihydrate, and
- 10 to 35 wt % pozzolanic material;
- and
- at least one of the first and second covering layers (11, 12) comprises a glass fibre-based sheeting, said sheeting being fully or partially embedded in a cementitious matrix.
Dependencies are inferred from the claim text.