Patent ID: 6379601
Filing Date: 2002-04-30
Classification: C04B,E04D,E04F

Abstract:
A method of manufacturing a precast concrete plate having a top surface and a bottom surface, the plate being adapted for arrangement with other like plates to form a decorative and/or protective covering with the top surface of the plate disposed to face outwardly and the bottom surface disposed to face inwardly towards an underlying support, said plate comprising at least one layer of a concrete composition, said composition comprising a polymeric modifier, at a concentration of about 0.2% to about 5% by weight of the concrete composition, having a Tg of above âˆ’40Â° C.,wherein at least 60% by weight of said modifier is distributed in no more than about 50% of the thickness of said plate, when measured from the bottom surface of said plate towards the top surface of said plate, which method comprises superimposing two or more layers of mortars of different compositions and characteristics, one of which layers comprises both the bottom surface of the plate and the highest concentration of said polymeric modifier in all of said layers which form the plate.