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Pozzolana From Wikipedia, the free encyclopedia Jump to: navigation, oceanrch Pozzolana, also cognize as pozzolanic change (pulvis puteolanus in Latin), is a siliceous or siliceous and aluminous material which reacts with calcium hydroxide in the front of pee at room temperature (cf. pozzolanic answer). In this reaction water-insoluble calcium silicate hydrate and calcium aluminate hydrate compounds are chance variable possessing cementitious properties. The designation pozzolana is derived from one of the primary deposits of volcanic ash tree use by the Romans in Italy, at Pozzuoli. Nowadays the explanation of pozzolana encompasses any volcanic material (pumice or volcanic ash), preponderantly composed of fine volcanic glass, that is used as a pozzolan. Note the difference with the term pozzolan, which exerts no bearing on the specific origin of the material, as opposed to pozzolana, which can further be used for pozzolans of volcanic origin, primarily composed of vo lcanic glass. Historical use Pozzolanas such as Santorin earth were used in the Eastern Mediterranean since 500-400 BC. Although pioneered by the ancient Greeks, it was the Romans that evetu whollyy ingurgitate developed the potential of spread out-pozzolan pastes as binder word form in Roman concrete used for buildings and underwater construction. Vitruvius speaks of tetrad types of pozzolana: black, white, grey, and red, all of which can be found in the volcanic areas of Italy, such as Naples. Typically it was very thoroughly involved two-to-one with lime just prior to mixing with water. The Roman style at Cosa was built of pozzolana-lime concrete that was poured underwater, apparently using a persistent tube to carefully lay it up without allowing sea water to mix with it. The three piers are still evident today, with the underwater portions in generally excellent condition even afterwards more than 2100 years. Geochemistry and mineralogy The major pozzolanically active component of volcanic pumices and as! hes is a highly porous glass.[1] The easily...If you want to get a full essay, order it on our website: OrderEssay.net

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