Where Does Pozzolanic Cement Come from?

Pozzolanic cements are mixtures of portland cement and a pozzolanic material that may be either natural or artificial. The natural pozzolanas are mainly materials of volcanic origin but include some diatomaceous earths. Artificial materials include fly ash, burned clays, and shales.

How is pozzolana cement made?

Pozzolana, also spelled pozzuolana, or pozzolan, hydraulic cement discovered by the Romans and still used in some countries, made by grinding pozzolana (a type of slag that may be either natural—i.e., volcanic—or artificial, from a blast furnace) with powdered hydrated lime.

What are pozzolanic materials and how they are derived?

The natural pozzolanas are mainly volcanic dust and ash materials, the term 'pozzolana' being derived from the Roman source of zeolitic tuff at Pozzuoli in the foothills of Mount Vesuvius.