Slag cement
AssigneeSlagcem LLC
InventorLawrence L. Hoffis
Life of this patent
Estimating the term…
Abstract
A slag cement includes ground granulated blast furnace slag and ground limestone combined in a predetermined weight ratio. Limestone and granulated blast furnace slag (GBFS) are fed to a grinding apparatus in a ratio of about 3-5% limestone by weight. The limestone is a cheaper raw material than the GBFS, resulting in a reduction in production costs for the slag cement. Moreover, the addition of limestone to the GBFS surprisingly results in improved compressive strength.
Claims9
A method for producing a slag cement comprising the steps of:
- providing a supply of granulated blast furnace slag;
- providing a supply of limestone;
- combining the granulated blast furnace slag and limestone in a ratio of less than about 15% by weight limestone to granulated blast furnace slag;
- and
- grinding the granulated blast furnace slag and limestone to cement fineness to produce a slag cement consisting essentially of granulated blast furnace slag and limestone.
A method for producing a slag cement comprising the steps of:
- providing a supply of granulated blast furnace slag ground to a cement fineness;
- providing a supply of limestone ground to a cement fineness;
- and
- combining the ground granulated blast furnace slag and ground limestone in a ratio of less than about 15% by weight limestone to granulated blast furnace slag suitable for use as a slag cement consisting essentially of granulated blast furnace slag and limestone.
A slag cement comprising ground granulated blast furnace slag and about 3-15% by weight ground limestone.
Dependencies are inferred from the claim text.