pozzolana

[pot-suh-lah-nuh; Italian pawt-tsaw-lah-nah]
noun
a porous variety of volcanic tuff or ash used in making hydraulic cement.
Also, pozzolan [pot-suh-luhn] , pozzuolana [pot-swuh-lah-nuh; Italian pawt-tswaw-lah-nah] , puzzolan, puzzolana.


Origin:
1905–10; < Italian < Latin puteolāna, feminine of puteolānus of Pozzuoli (< Latin Puteolī literally, little springs); see -an

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Collins
World English Dictionary
pozzuolana or pozzolana (ˌpɒtswəˈlɑːnə, ˌpɒtsəˈlɑːnə)
 
n
1.  a type of porous volcanic ash used in making hydraulic cements
2.  any of various artificial substitutes for this ash used in cements
 
[C18: from Italian: of Pozzuoli]
 
pozzolana or pozzolana
 
n
 
[C18: from Italian: of Pozzuoli]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

pozzolana

hydraulichydraulic 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

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Artificial pozzolana are materials such as blast- furnace slag, ground brick, and some fly ashes from powdered coal furnaces.
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