Pozzolana or pozzuolana (/ˌpɒts(w)əˈlɑːnə/POT-s(w)ə-LAH-nə, Italian:[potts(w)oˈlaːna]), also known as pozzolanic ash (Latin: pulvis puteolanus), is a natural siliceous or siliceous-aluminous material which reacts with calcium hydroxide in the presence of water at room temperature (cf. pozzolanic reaction). In this reaction insoluble calcium silicate hydrate and calcium aluminate hydrate compounds are formed possessing cementitious properties. The designation pozzolana is derived from one of the primary deposits of volcanic ash used by the Romans in Italy, at Pozzuoli. The modern definition of pozzolana encompasses any volcanic material (pumice or volcanic ash), predominantly 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 only be used for pozzolans of volcanic origin, primarily composed of volcanic glass.
Pozzolana or pozzuolana (/ˌpɒts(w)əˈlɑːnə/ POT-s(w)ə-LAH-nə, Italian: [potts(w)oˈlaːna]), also known as pozzolanic ash (Latin: pulvis puteolanus), is...
as binders. Volcanic dusts, called pozzolana or "pit sand", were favoured where they could be obtained. Pozzolana makes the concrete more resistant to...
calcium hydroxide and water is given by measuring its pozzolanic activity. Pozzolana are naturally occurring pozzolans of volcanic origin. Mixtures of calcined...
mineral resource. Italy is one of the world's leading producers of pumice, pozzolana, and feldspar. Another notable mineral resource is marble, especially...
were made of lime and pozzolana, a type of volcanic ash, set into an underwater concrete. Herod imported over 24,000 m3 of pozzolana from the name-giving...
its nesting sites being taken over by tourism. In Italy the beaches of Pozzolana di Ponente on Linosa and Isola dei conigli on Lampedusa are two of the...
as pozzolana mortar. Pozzolana is a volcanic clay substance located in and around Naples. The mixture ratio for the cement was two parts pozzolana and...
for hydraulic cement was found by ancient Romans who used volcanic ash (pozzolana) with added lime (calcium oxide). Non-hydraulic cement (less common) does...
food consumed in Cape Verde is imported. Mineral resources include salt, pozzolana (a volcanic rock used in cement production), and limestone. Its small...
Rajasthan. It was started in 2010 under RK Group. It manufactures Portland pozzolana and ordinary Portland cement for plaster, brickwork, and other construction...
and may be regarded as a trachytic tuff. It much resembles the Italian pozzolana and is applied to like purposes. Mixed with lime and sand, or with Portland...
invented in the late 3rd century BC. It was a powerful cement derived from pozzolana, and soon supplanted marble as the chief Roman building material and allowed...
the 1990s begun researching into Pozzolana cement, an alternative cement to the Portland cement for building. Pozzolana cement cost less than Portland cement...
coal, or oil. Italy is one of the world's leading producers of pumice, pozzolana, and feldspar. Another mineral resource for which Italy is well-known...
Empire, Roman concrete (or opus caementicium) was made from quicklime, pozzolana and an aggregate of pumice. Its widespread use in many Roman structures...
combinations of different limestones and additives, including trass and pozzolanas, intended for the construction of a lighthouse, now known as Smeaton's...
273 BC. Ancient Roman concrete was a mixture of lime mortar, aggregate, pozzolana, water, and stones, and was stronger than previously used concretes. The...
as La Pucelle. Another theory is that Pucela comes from the fact that Pozzolana cement was sold there, the only city in Spain that sold it. Valladolid...
the preparation of lime mortars. For structural mortars, he recommended pozzolana, which were volcanic sands from the sandlike beds of Pozzuoli brownish-yellow-gray...
aqueduct was built of local limestone. Stones were attached with the use of pozzolana. It was this successful feature that gave most praise to Bontadini. The...
variation of strength found in natural stone. One type of cement, called pozzolana, consisted of water, lime, sand, and volcanic rock. Brick and mortar bridges...
for raising exquisite snails.[citation needed] The local volcanic sand, pozzolana (Latin: pulvis puteolanus, "dust of Puteoli") formed the basis for the...
of Maio; limestone on the islands of Boa Vista, Sal, and Santo Antão; pozzolana on the island of Santo Antão; and salt on the islands of Maio and Sal...
height of 44 m (144 ft) Internal courts: 67 m × 29 m (220 ft × 95 ft) Pozzolana: 341,000 m3 (12,000,000 cu ft) Quick lime: 35,000 m3 (1,200,000 cu ft)...
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