| The secret of Roman success in making cement was traced to the mixing of slaked lime with pozzolana, a volcanic ash from Mount Vesuvius. |
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| Mixtures of lime and pozzolana still find some application but largely have been superseded by the modern pozzolanic cement. |
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| Les sorted materials whose diameter is lower than 400 mm are called pozzolana of Auvergne. |
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| Vessel in experimental sample which has been plugged by a thin layer of pozzolana ash in rosin oil. |
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| Hydration of the portland cement fraction releases the lime required to combine with the pozzolana. |
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| The Romans also discovered a natural cement, called pozzolana, which they used for piers in rivers. |
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| The Romans invented concrete, mixed from pozzolana, a volcanic ash mined on the slopes of Mount Vesuvius, which forms a natural cement when combined with lime. |
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| Finally, the mortar of lime, sand, water, and pozzolana was mixed with stones and broken brick to form a true concrete, called opus caementicium. |
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| The wood surface was at this point completely obscured by the pozzolana powder. |
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| In Fig. 5b, it is not possible to discern the presence of the pozzolana layer. |
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| This effect has been replicated in the experimental sample shown in Fig.5b, where a very thin layer of finely ground pozzolana ash has been used as a barrier layer. |
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| When mixed with lime, pozzolana forms a natural cement that is much stronger and more weather-resistant than lime mortar alone and that will harden even under water. |
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| The first category includes granulated blast furnace slags from the iron producing industry and fly ashes from power station firing systems, while natural pozzolana and limestone are examples for the second category. |
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| The pozzolana was applied in a water-based slurry, and allowed to dry. |
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| The main area of application of this version of the arched plate conveyor is the hopper discharge of moist and sticky materials e.g. clay, marl, natural or FGD-gypsum, anhydrite, pozzolana etc. |
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| Since then Pozzuoli has been living on the profits derived from many local glass and ceramics manufactures, from the exportation of sulphur and alum and from the pozzolana quarries. |
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| More than 20 raw materials are used on the site: humus, old peat, younger peat, algae, manure, grape marc, pozzolana, bark, vegetable compost, etc. |
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| It was a powerful cement derived from pozzolana, and soon supplanted marble as the chief Roman building material and allowed many daring architectural forms. |
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| After the Roman Empire, the use of burned lime and pozzolana was greatly reduced until the technique was all but forgotten between 500 and the 14th century. |
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| Al-Rajhi Cement Jordan operates a cement manufacturing plant in Al-Mafraq, Jordan, producing gypsum, limestone, white cement and Pozzolana Portland cement. |
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