Method of the production of superhigh early strength cements

Abstract

Abstract Method of the production of superhigh early strength cements which comprises using, in addition to the materials such as limestone, clay and pyrite cinder generally used as the raw materials for portland cements, a raw material containing as the major or minor component a chromium compound such as chromite and a raw material containing as the major or minor component a fluoride such as fluorite, in the preparation of raw mixtures which are obtained either by mixing crushed or ground said raw materials or by further grinding the raw mixtures, mixing said raw materials in such a ratio as to provide contents of tricalcium silicate (3CaO.SiO2), tricalcium aluminate (3CaO.Al2O3) chromium oxide (Cr2O3) and fluorine (F) in clinkers which are obtained by sintering said raw mixtures within the ranges set forth in the table Compound or element Scope of content (%) Tricalcium silicate (3CaO.SiO2) 65 to 86 Tricalcium aluminate (3CaO.Al2O3) 7 to 13 Chromium oxide (Cr2O3) 0.3 to 1.5 Fluorine (F) 0.2 to 1.0 IN THE PREPARATION OF CEMENTS BY CRUSHING MIXTURES OF SAID CLINKERS AND GYPSUMS, ADDING TO SAID CLINKERS SUCH AMOUNTS OF GYPSUM THAT CONTENTS OF SULFURIC ANHYDRIDE (SO3) in said cements are within a range between 1.5 and 4.5 percent and grinding the resulting cements to produce specific surface areas of said cements with a range between 4,500 and 6,000 cm2/g.

Inventors

• 👤 Hideo Teramoto
• 👤 Tatsuo Kasakawa

Bibliographic Details