MANUFACTURE OF SUPERHIGH EARLY STRENGTH PORTLAND CEMENT

A CEMENT WITH A ONE-DAY COMPRESSIVE STRENGTH TWICE THAT OF CONVENTIONAL HIGH EARLY STRENGTH PORTLAND CEMENT WAS OBTAINED BY FINELY GRINDING CLINKER CONTAINING SMALL AMOUNTS OF CR203, MANGANESE OXIDE, AND FLUORINE WITH ABOUT 8% GYPSUM. EFFECTS OF FINESS, GYPSUM CONTENT, COMPOSITION OF MAJOR CLINKER MINERALS, ADDITON OF SPECIAL COMPONENTS TO RAW MIXES, ETC. ON THE EARLY STRENGTH OF PORTLAND CEMENT WERE STUDIED. PROPERTIES OF MORTARS AND CONCRETES OF THE CEMENT THUS OBTAINED WERE DETERMINED. /AUTHOR/