ALKALINE SULFOALUMINOSILICATE HYDRAULIC CEMENT AND PROCESS FOR ITS MANUFACTURE

摘要

An alkaline sulfoaluminosilicate hydraulic cement contains water, calcium magnesium aluminosilicate glass, portland cement clinker, sinter made from sodium zeolite and an SO4<2->-containing component, metakaolin and alkali metal compounds. Used as zeolites may be either synthetic zeolite and zeolite-containing rock in which the main rock-forming minerals are clinoptilolite, mordenite, gmelinite and analcime. Used as a SO4<2->-containing component is a technical product, Na2SO4 or natural raw materials, by-products or alumino-potassium alums. The sinter is obtained by thermal activation in the temperature range 500 DEG to 800 DEG C of sodium zeolite and SO4<2->-containing component taken in a ratio ranging between 1:1 to 4:1. A bonding matrix obtained from the alkaline sulfoaluminosilicate hydraulic cement upon mixing with water comprises alkaline sulfoaluminate and sulfoaluminosilicate phases. The concrete composition exhibits high sulfate resistance, stable strength characteristics under alternate wetting-drying as well as low shrinkage along with high compressive strength and rapid strength gain.