Patent ID: 6776838
Filing Date: 2004-08-17
Classification: C03C,C04B,Y10T

Abstract:
A blended pozzolanic cement produced by blending with portland cement, from 5 to 40% by weight of the total composition of a fine white pozzolan comprising a finely ground vitreous calcium aumino-silicate (CaOâ€”Al2O3â€”SiO2) powder derived from previously discarded glass fibers having low alkali and low iron content and low levels of discolorants;said powder having an alkali content by weight of not more than 2% as (Na2O+K2O), an iron content by weight of not more than 0.8% as Fe2O3, and being substantially white in color with a reflectance value of at least 80 as measured by a Technibrite TB-1C colorimeter according to the ISO 2467, 2471 method; at least 95% by weight of the powder comprising particles of less than 45 microns E.S.D. and said particles having a blocky, relatively equi-dimensional particle shape wherein the average aspect ratio of the particles is less than 2:1, and with substantially no residual high aspect ratio fibers.