Early strength cements
AssigneeThe Associated Portland Cement Manufacturers Limited
InventorsRansom James Murray, Arthur William Brown
Life of this patent
Estimating the term…
Abstract
An early strength hydraulic cement comprising: from 15 to 90 per cent by weight based on the cement, of an orthorhombic or tetragonal phase XC.sub.14 A.sub.5 which is NC.sub.14 A.sub.5 as herein defined or the corresponding phase in which the place of the sodium oxide is at least partly taken by at least one other alkali metal oxide; the balance being predominantly calcium silicates.
Claims8
An early strength hydraulic cement comprising from 15 to 90 percent by weight, based on the cement, of an alkali metal calcium aluminate phase formed in the calcium oxide-alumina-alkali metal oxide systems by the presence of at least one alkali metal oxide in a total amount of alkali metal oxide in excess of the solid solution limit thereof in cubic tricalcium aluminate, at least part of said at least one alkali metal oxide being sodium oxide and the balance of the cement being predominantly calcium silicates.
A method of preparing an early strength hydraulic cement comprising from 15 to 90 percent by weight, based on the cement, of an alkali metal calcium aluminate phase formed in the calcium oxide-alumina-alkali metal oxide systems by the presence of at least one alkali metal oxide in a total amount of alkali metal oxide in excess of the solid solution limit thereof in cubic tricalcium aluminate, at least part of said at least one alkali metal oxide being sodium oxide and the balance of the cement being predominantly calcium silicates, which method comprises grinding a clinker formed by burning high alumina Portland cement ingredients in the presence of alkali to form in the resultant product the requisite amount of said alkali metal calcium aluminate phase.
A method of preparing an early strength hydraulic cement comprising from 15 to 90 percent by weight, based on the cement, of an alkali metal calcium aluminate phase formed in the calcium oxide-alumina-alkali metal oxide systems by the presence of at least one alkali metal oxide in a total amount of alkali metal oxide in excess of the solid solution limit thereof in cubic tricalcium aluminate, at least part of said at least one alkali metal oxide being sodium oxide and the balance of the cement being predominantly calcium silicates, which method comprises grinding a clinker containing said alkali metal calcium aluminate phase with a Portland cement clinker.
A method of preparing an early strength hydraulic cement comprising from 15 to 90 percent by weight, based on the cement, of an alkali metal calcium aluminate phase formed in the calcium oxide-alumina-alkali metal oxide systems by the presence of at least one alkali metal oxide in a total amount of alkali metal oxide in excess of the solid solution limit thereof in cubic tricalcium aluminate, at least part of said at least one alkali metal oxide being sodium oxide and the balance of the cement being predominantly calcium silicates, which method comprises blending a cement containing said alkali metal calcium aluminate phase with another cement.
Dependencies are inferred from the claim text.