Cement-based powdered water-repellent composition, and its applications
OwnerRichard Kraszewski, Jean J. Damiguetinventors
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Abstract
This invention relates to a cement-based powdered water-repellent composition, comprising, expressed as dry weight: (a) 20-60% of a cement, (b) 30-70% of an inorganic or organic filler, (c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres, (d) 0.2-1% of plasticizers for cement, (e) 1-3% of an adhesive, (f) 0.1-0.5% of a water-repellent. This composition is useful for the production of coatings and molded products, having very high mechanical strength and water-repellent properties. This composition may additionally contain 0.1-2% alkalinity-reducing buffer salts.
Claims12
Cement-based powdered water-repellent composition, comprising, expressed as dry weight:
- (a) 20-60% of a cement,
- (b) 30-70% of an inorganic or organic filler,
- (c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,
- (d) 0.2-1% of plasticizers for cement,
- (e) 1-3% of an adhesive,
- (f) 0.1-0.5% of a water-repellent.
Composition as claimed in claim 1, comprising additionally, per 100 parts by weight of the composition of claim 1, 1-20 parts by weight of a coloring agent, 0.1-0.5 parts by weight of an air-removing agent, 0.1-0.5 parts by weight of a water-retaining agent.
Process for the preparation of a cement-based powdered water-repellent composition, comprising, expressed as dry weight:
- (a) 20-60% of a cement,
- (b) 30-70% of an inorganic or organic filler,
- (c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,
- (d) 0.2-1% of plasticizers for cement,
- (e) 1-3% of an adhesive,
- (f) 0.1-0.5% of a water-repellent,
- comprising first mixing the silicate fibres, optionally together with the buffer salts and the adhesive, then adding the water-repellent agent, and then adding to the resulting mixture the cement and the plasticizer previously dispersed in the filler.
Coating or molded product, prepared with a cement-based powdered water-repellent composition, comprising, expressed as dry weight:
- (a) 20-60% of a cement,
- (b) 30-70% of an inorganic or organic filler,
- (c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,
- (d) 0.2-1% of plasticizers for cement,
- (e) 1-3% of an adhesive,
- (f) 0.1-0.5% of a water-repellent,
- diluted with 10-40 wt% water with respect to its weight, and then applied to a substrate or a mold by any suitable means.
Member for collecting solar energy, comprising a cured cement-based powdered water-repellent composition, comprising, expressed as dry weight:
- (a) 20-60% of a cement,
- (b) 30-70% of an inorganic or organic filler,
- (c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,
- (d) 0.2-1% of plasticizers for cement,
- (e) 1-3% of an adhesive,
- (f) 0.1-0.5% of a water-repellent,
- in which are provided channels for the flow of a heat-carrying fluid.
Dependencies are inferred from the claim text.