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Pozzolana from Mount Vesuvius volcano, Italy. Pozzolana or pozzuolana (/ ˌ p ɒ t s (w) ə ˈ l ɑː n ə / 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).
Natural pozzolana (volcanic ash) deposits situated in Southern California in the United States. Pozzolans are a broad class of siliceous and aluminous materials which, in themselves, possess little or no cementitious value but which will, in finely divided form and in the presence of water, react chemically with calcium hydroxide (Ca(OH) 2) at ordinary temperature to form compounds possessing ...
The harbour of Caesarea is an example (22-15 BC) of the use of underwater Roman concrete technology on a large scale, [10] for which enormous quantities of pozzolana were imported from Puteoli. [13] For rebuilding Rome after the fire in 64 AD which destroyed large portions of the city, Nero's new building code largely called for brick-faced ...
The pozzolanic activity is a measure for the degree of reaction over time or the reaction rate between a pozzolan and Ca 2+ or calcium hydroxide (Ca(OH) 2) in the presence of water.
Portland cement, blast furnace slag or fly ash and pozzolana * Constituents that are permitted in portland-composite cements are artificial pozzolans (blast furnace slag (in fact a latent hydraulic binder), silica fume, and fly ashes), or natural pozzolans (siliceous or siliceous aluminous materials such as volcanic ash glasses, calcined clays ...
Pozzolana also is a decomposed tuff, but of basic character, originally obtained near Naples and used as a cement, but this name is now applied to a number of ...
In Italy the beaches of Pozzolana di Ponente on Linosa and Isola dei conigli on Lampedusa are two of the last remaining sites where the turtle regularly lays its eggs, the others (larger) being in southern Calabria (close to Reggio Calabria). The Area Marina Protetta Isole Pelagie nature reserve, covering all three islands, was instituted in 2002.
Caesarea (/ ˌ s ɛ z ə ˈ r iː ə, ˌ s ɛ s-, ˌ s iː z-/) [a] also Caesarea Maritima, Caesarea Palaestinae or Caesarea Stratonis, [1] [2] [b] was an ancient and medieval port city on the coast of the eastern Mediterranean, and later a small fishing village.