/pot'seuh lah"neuh/; It. /pawt'tsaw lah"nah/, n.
a porous variety of volcanic tuff or ash used in making hydraulic cement.
Also, pozzolan /pot"seuh leuhn/, pozzuolana /pot'sweuh lah"neuh/; It. /pawt'tswaw lah"nah/, puzzolan, puzzolana.
[1905-10; < It < L puteolana, fem. of puteolanus of POZZUOLI ( < L Puteoli lit., little springs); see -AN]

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also spelled  pozzuolana , or  pozzolan 

      hydraulic cement discovered by the Romans and still used in some countries, made by grinding pozzolana (a type of slag that may be either natural—i.e., volcanic—or artificial, from a blast furnace) with powdered hydrated lime. Roman engineers used two parts by weight of pozzolana mixed with one part of lime to give strength to mortar and concrete in bridges and other masonry and brickwork. During the 3rd century BC, the Romans used pozzolana instead of sand in concrete and mortared rubblework, giving extraordinary strength. Used with an aggregate of broken tuff, travertine, brick, or marble, the material contributed to the evolution of new architectural forms in such monumental constructions as the Pantheon and the Baths of Caracalla at Rome.

      Pozzolana was first found at Puteoli (modern Pozzuoli), near Naples, where there are still extensive beds, and also around Rome. Natural pozzolana is composed mainly of a fine, chocolate-red volcanic earth. An artificial pozzolana has been developed that combines a fly ash and water-quenched boiler slag.

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Universalium. 2010.

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  • Pozzolana — Pozzolana, also known as pozzolanic ash, is a fine, sandy volcanic ash, originally discovered and dug in Italy at Pozzuoli in the region around Vesuvius, but later at a number of other sites. Vitruvius speaks of four types of pozzolana: black,… …   Wikipedia

  • Pozzolana — Pozzuolana Poz zu*o*la na, Pozzolana Poz zo*la *na, n. [It.] Volcanic ashes from Pozzuoli, in Italy, used in the manufacture of a kind of mortar which hardens under water. [1913 Webster] …   The Collaborative International Dictionary of English

  • pozzolana — or pozzolan noun Etymology: Italian pozzolana Date: circa 1706 finely divided siliceous or siliceous and aluminous material that reacts chemically with slaked lime at ordinary temperature and in the presence of moisture to form a strong slow… …   New Collegiate Dictionary

  • pozzolana — 1poz·zo·là·na s.f. TS mar. piccola imbarcazione usata nel Napoletano per la pesca con le nasse e i tramagli; anche agg.: barca pozzolana {{line}} {{/line}} DATA: 1937. ETIMO: der. del lat. Puteolanus, der. di Puteoli, nome di una località in… …   Dizionario italiano

  • pozzolana — noun A type of volcanic ash used for mortar or for cement which sets under water. See Also: pozzolan, pozzolanic …   Wiktionary

  • pozzolana — {{hw}}{{pozzolana}}{{/hw}}s. f.  (pl. pozzolane ) (geol.) Tufo recente, poco cementato, di colore grigio o rossastro, usato per far malte idrauliche …   Enciclopedia di italiano

  • pozzolana — pozzolana1 pl.f. pozzolane pozzolana2 pl.f. pozzolane …   Dizionario dei sinonimi e contrari

  • pozzolana — [ˌpɒtsə lα:nə] noun a type of volcanic ash used for mortar or for cement that sets under water. Origin C18: from Ital., from pozz(u)olana (earth) of Pozzuoli , a town near Naples …   English new terms dictionary

  • pozzolana — poz·zo·la·na …   English syllables

  • pozzolana — n. (also puzzolana) a volcanic ash used for mortar or hydraulic cement. Etymology: It., f. pozz(u)olano (adj.) of Pozzuoli near Naples …   Useful english dictionary

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