WATER-REPELLENT FINISHING CONSTRUCTION MATERIAL PRODUCING METHOD Russian patent published in 2009 - IPC C04B28/02 C04B111/20 

FIELD: construction industry.

SUBSTANCE: invention refers to dry mortar preparation method, and is meant for being used in construction materials industry. Producing method of dry water-repellent construction finishing material involves mixing of portland cement, ground chalkstone, sand of the Sychevsky field with fineness modulus M_fineness=3.2-3.8, which is preheated up to 90-110°C, and water-repellent chalkstone in the form of fine powder consisting of round chalkstone particles coated with water-repellent agent- 1% of synthetic fatty acids of C fraction 17-20. Mixing is carried out in multiple-blade mixer of continuous or cyclic action, which is inclined to 45°, during 5-10 minutes, at the following component ratio (wt %): portland cement 18-22, the above sand 45-55, ground chalkstone 15-25, and the above water-repellent chalkstone 10-15.

EFFECT: producing water-repellent construction material maintaining looseness and activity during storage and transportation in dry condition; improving strength and cold resistance of ready-made items; improving placeability and reducing adhesion to metal of finishing dip prepared based on proposed material; and improving whiteness of finishing material and ready-made items based thereon.

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