Definition of pozzolana

i. A leucitic tuff quarried near Pozzuoli, Italy, and used in the manufacture of hydraulic cement. The term is now applied more generally to a number of natural and manufactured materials, such as ash and slag, that impart specific properties to cement. Pozzolanic cements have superior strength when cured and are resistant to saline and acidic solutions. Also spelled: pozzolan; pozzuolana; pozzuolane.



See Also: gaize

ii. A material that is capable of reacting with lime in the presence of water at ordinary temperature to produce a cementitious compound. Natural pozzolanas are siliceous material of volcanic origin. They include trass and Santorin earth. Blast furnace slag is used to produce artificial pozzolanas.

Ref: CCD, 2