A high early strength pozzolan cement includes larger sized pozzolan particlesand smaller sized hydraulic cementparticles which contain tricalcium silicate (e.g., Portland cement). Particleslarger than 10 µm are predominantly (50%, 65%, 75%,85% or 95%) pozzolan particles, and particles smaller than 10 µm arepredominantly (50%, 65%, 75%, 85% or 95%) hydrauliccement particles. Excess calcium from the hydraulic cement forms calciumhydroxide available for reaction with the pozzolanparticles, optionally in combination with supplemental lime. At least 30%,40%, 45%, 55%, 65% or 75% of the pozzolan cement(combined pozzolan and hydraulic cement particles) consists of pozzolan, andless than 70%, 60%, 55%, 45%, 35% or 25%consists of hydraulic cement.
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