ALKALINE ALUMINOFERROSILICATE HYDRAULIC CEMENT

摘要

An alkaline aluminoferrosilicate hydraulic cement contains water, calcinated dolomite, portland cement clinker, metallurgical slag selected from nonferrous, blast furnace electrothermophosphorous, reactive silica, and alkali metal compounds. The calcinated dolomite essentially consists of, in % by weight, 50 to 55 CaO and 30 to 35 MgO and is obtained by sintering a dolomite CaMg(CO3)2 at a temperature of between 800 DEG and 950 DEG C until CaCO3 and MgCO3 have undergone full decomposition. The reactive silica is a silica fume, fly ash from coal combustion, amorphous silica or silicic acid. The alkali metal compound is a K, Na or Li compound causing an alkaline reaction in an aqueous medium, or a mixture thereof. A bonding matrix obtained from the blended alkaline alimunoferrosilicate hydraulic cement after mixing with water essentially consists of the molecular formula: (Li, K, Na)1-8Mg0-3Ca4-15[Al1-4Fe<2+>3-0Fe<3+>2-16Si6-24O15-50](8-15)H2O. The cement is produced by mixing in a certain sequence all of the components. The cement can be used as a neat cement or with fillers, such as sand, gravel, slags, crushed serpentinite rock to make mortars and concrete, standing out for a high abrasion resistance, good adhesion to metals and protective properties against gamma and neutron radiation.