ABSTRACT
Pozzolanas, or pozzolanic materials, are defined as siliceous and aluminous materials that on their own possess little or no cementitious value, but which will - if present in finely divided form and in the presence of moisture - react chemically with calcium hydroxide at ordinary temperature to form compounds possessing cementitious properties (ASTM C 619-89). The required calcium hydroxide may also be introduced in the form of materials that liberate this compound in the course of their hydration, such as Portland cement.
