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Pozzolan
The most common modern pozzolan is fly ash, like this split fly ash being collected in the Emory River. The spherical particles in fly ash make the cement made from it especially workable and reduce water demand, and the use of fly ash does not add to any carbon impact.
Pozzolan is a category of materials that exhibit cement-like properties when combined with calcium hydro xide (slaked lime) and that are typically added as a cement extender to Portland cement concrete mixtures. The category takes its name from pozzolana, a volcanic ash discovered in Pozzuoli, Italy, in the Mt. Vesuvius region. Siliceous and aluminous (containing silicon dioxide and aluminum oxide), pozzolana reacts with calcium hydroxide when mixed with it and water, forming a cement-like substance at ...
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