Pozzolana cements are those which, by definition, contain fly ash, silica fume or a variety of natural pozzolans as an additive.
The rate of strength gain is excellent, and unlike other cements, significant strength development after 28 days may be achieved, attaining highest compressive strength at age 90-120 days.
These cements have a low-heat hydration. This unique attribute makes them ideal for mass concrete pours, reinforced or unreinforced, in which temperature control becomes an issue, as well as at construction sites where marine chlorides may induce corrosion of reinforcement steel in concrete.