Patent ID: 8323399

Claim:
A blended cement composition comprising: a hydraulic cement fraction comprised of differently sized hydraulic cement particles, wherein the hydraulic cement fraction, when mixed with water, provides excess calcium hydroxide that is available for reaction with a pozzolan, the hydraulic cement fraction having a Blaine fineness greater than about 500 m 2 /kg, the hydraulic cement fraction comprising Portland cement and ground granulated blast-furnace slag; and a pozzolan fraction comprised of differently sized pozzolan particles selected from the group consisting of fly ash, ground slag, and/or natural pozzolan that reacts with calcium hydroxide in the presence of water, including calcium hydroxide provided by the hydraulic cement fraction when mixed with water, in order to form solid hydration products having cementitious properties, the pozzolan fraction having a Blaine fineness that is less than the Blaine fineness of the hydraulic cement fraction.