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US 7,419,544 B2Granted
Additive for dewaterable slurry and slurry incorporating same
AssigneeJames Hardie International Finance B.V.
InventorsBasil Naji, Milton O'Chee
Life of this patent
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Abstract
A cementitious slurry comprising fly ash having a predominant particle size of up to about 10 microns, and/or aluminous material having a predominant particle size of up to about 150 microns. The additive acts as a water reduction agent and can replace either wholly or partially a conventional plasticiser.
Claims11
A cementitious slurry comprising:
- cement;
- water;
- a plasticiser;
- a dewatering additive including a component selected from the group consisting of:
- (i) a fly ash having particles with a predominant size up to about 10 microns forming about 30 wt % to 100 wt % based on the weight of said cement in the slurry;
- (ii) aluminous material having particles with a predominant size less than about 150 microns forming about 5-30 wt % based on the weight of said cement in the slurry, wherein the aluminous material is selected from the group consisting of hydrated alumina, partially hydrated alumina and unhydrated alumina;
- and
- (iii) both the fly ash of (i) and the aluminous material of (ii);
- wherein the components (i), (ii), or (iii) of said dewatering additive are added to provide water reduction, and the amount of said fly ash having said particle sizes is greater than the amount of said cement by weight percentage.
6 more elements
A cementitious slurry comprising:
- a hydraulic binder for cement;
- water;
- a water reducer selected from the group consisting of:
- (i) fly ash having particle sizes up to about 10 microns;
- (ii) an aluminous material selected from the group consisting of hydrated alumina, partially hydrated alumina, unhydrated alumina and mixtures thereof;
- wherein said water reducer reduces by about 20%-40% the amount of water required in the slurry to achieve substantially the same slurry viscosity as a cementitious slurry of an equivalent formulation substantially identical in composition to the formulation of the cementitious slurry but without said water reducer.
3 more elements
Dependencies are inferred from the claim text.