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Pozzolana

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Pozzolana 

(also pozzuolana or pozzolan), rocks consisting of loose products of volcanic eruptions (ash, tuffs, pumice). Owing to its hydraulic activity (the absorption of milligrams of CaO from 1 g of lime solution), pozzolana is used as a hydraulic additive in the production of binding materials called pozzolana cements. Similar hydraulic cements are called trasses. Large deposits of pozzolana are located in Italy. In the USSR deposits of pozzolana and trass are found in the Northern Caucasus (city of Nal’chik), in the Crimea (Mount Karadag), and the Armenian SSR.



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The cement industry concludes the following contents -Cement clinker -Portland cement, Ordinary Portland cement, Slag cement, Portland Cement Fly Ash, Portland Pozzolana cement, Composite Portland cement, etc.
It was the contemporaneous development of the arch and discovery of pozzolana mortar, with a new need for large gathering spaces for social institutions, and the availability of wealth from conquests and taxation which provided the wherewithal for buildings that met a compelling 'desire to match the architectural accomplishments of conquered territories in the Hellenistic Greek world'.
The Romans invented concrete, mixed from pozzolana, a volcanic ash mined on the slopes of Mount Vesuvius, which forms a natural cement when combined with lime.
 
 
 
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