The general definition of a pozzolan embraces a large number of materials which vary widely in terms of origin, composition and properties. Both natural and artificial (man-made) materials …

A pozzolan is a siliceous or siliceous and aluminous material that in itself possesses little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically …

Natural pozzolan can replace up to 40 percent (by weight) the Portland cement in a concrete mix as a Supplementary Cementitious Material (SCM) helping to offset the cement’s carbon …

pozzolana, hydraulic cement perfected by the Romans and still used in some countries, traditionally made by grinding a material of volcanic origin (the pozzolan) with powdered …

Most pozzolans are used individually, but blends of two or more different pozzolans can be used to take advantage of the characteristics each pozzolan offers. Typical examples are fly ash …

The modern definition of pozzolana encompasses any volcanic material (pumice or volcanic ash), predominantly composed of fine volcanic glass, that is used as a pozzolan. Note the difference …

The Natural Pozzolan Association is a network of natural pozzolan producers working to improve the performance and durability of the nation’s concrete infrastructure through the increased …

Fly ash—in particular Class F fly ash—has played the role of a natural pozzolan replacement for many decades. But as Bob Dylan wrote: “the times, they are a-changing.” The number of …

Natural pozzolan is an aggregate industrial material used principally as a replacement for coal fired fly ash and secondarily as a partial replacement for Portland cement in concrete. Natural …

Pozzolan (as it is called in English) is an incoherent, very porous, volcaniclastic rock, formed in remote times by rapid cooling of a liquid magma, ejected during a hydromagmatic eruption. …