High early strength cement-SCM blends

A cementitious blend comprising:

• a hydraulic cement fraction selected from the group consisting of Portland cement, calcium aluminate cement, magnesium silicate cement, oil well cement, and hydraulic cement having a tricalcium silicate content of at least 50% by weight, the hydraulic cement fraction having a d90 greater than 10 μm, a d50 greater than 5.75, a d10 greater than 1.0 μm, and a ratio d90/d10 less than or equal to about 25;
• a first supplementary cementitious material (SCM) fraction that contributes ultrafine SCM particles below the d10 of the hydraulic cement fraction so that at least 30% of combined SCM and hydraulic cement particles in the cementitious blend less than 2 μm comprise SCM and less than 70% comprise hydraulic cement;
• and
• a second SCM fraction that contributes coarse SCM particles above the d90 of the hydraulic cement fraction so that at least 50% of combined SCM and hydraulic cement particles in the cementitious blend larger than about 25 μm comprise SCM and less than 50% comprise hydraulic cement.

A cementitious blend comprising:

• a hydraulic cement fraction selected from the group consisting of Portland cement and hydraulic cement having a tricalcium silicate content of at least 50% by weight, the hydraulic cement fraction having a d90 greater than 10 μm, a d50 greater than 5.75, and a d10 greater than 1.0 μm;
• a first supplementary cementitious material (SCM) fraction that contributes ultrafine SCM particles below the d10 of the hydraulic cement fraction so that at least 30% of combined SCM and hydraulic cement particles in the cementitious blend less than 1 μm comprise SCM and less than 70% comprise hydraulic cement;
• and
• a second SCM fraction that contributes coarse SCM particles above the d90 of the hydraulic cement fraction so that at least 75% of combined SCM and hydraulic cement particles in the cementitious blend larger than the d90 of the hydraulic cement fraction comprise SCM and less than 25% comprise hydraulic cement.