A siliceous or siliceous and aluminous material which by itself possesses little or no cementitious value but that will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ambient temperatures to form compounds which exhibit cementitious properties. Pozzolans can be man-made such as fly ash, or naturally occurring.
a finely-divided material that reacts with calcium hydroxide and alkalies to form compounds possessing cementitious properties
a material that reacts in the presence of water with an activator such as lime, Portland Cement or kiln dust, to produce a cementitious material
a siliceous/aluminous material that, when mixed with lime and water, forms a cementitious compound
cement: Volcanic rock powdered and used in making hydraulic cement.
A mineral admixture that reacts chemically with calcium hydroxide formed during portland cement hydration to create supplementary cementitious materials. MetaMax® is a pozzolanic material.
(ASTM C 618) A siliceous, or siliceous and aluminous material, which in itself possesses little or no cementitious value but will, in a finely divided form, such as a powder or liquid and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to form permanent, insoluble compounds possessing cementitious properties.
A siliceous and aluminous material that, in the presence of moisture, chemically reacts with calcium hydroxide to form compounds possessing cementitious properties. (Also see cement replacement). primer – The first coat of material applied to a concrete surface to improve bonding or adherence of subsequent coats. See also bond coat.
A type of silicon/alumina material that occurs naturally and is produced as a byproduct of coal combustion. When powdered and moistened it will react with calcium hydroxide and water. Its most useable form is fly ash.
A fine material that is not a cement but which reacts with cement to form a cementitious binder. Flyash is a pozzolanic admixture. SI – Abbreviation for pounds per square inch.
A pozzolan is a material which, when combined with calcium hydroxide, exhibits cementitious properties. Pozzolans are commonly used as an addition to Portland cement concrete mixtures to increase the long-term strength and other material properties of portland cement concrete. Pozzolans are primarily vitreous siliceous materials which react with calcium hydroxide to form calcium silicates; other cementitious materials may also be formed depending on the constituents of the pozzolan.