Pozzolana

Related to Pozzolana: fly ash

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Pozzolana

(also pozzuolana or pozzolan), rocks consisting of loose products of volcanic eruptions (ash, tuffs, pumice). Owing to its hydraulic activity (the absorption of milligrams of CaO from 1 g of lime solution), pozzolana is used as a hydraulic additive in the production of binding materials called pozzolana cements. Similar hydraulic cements are called trasses. Large deposits of pozzolana are located in Italy. In the USSR deposits of pozzolana and trass are found in the Northern Caucasus (city of Nal’chik), in the Crimea (Mount Karadag), and the Armenian SSR.

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References in periodicals archive ?

To this aim, an experimental procedure was suitably developed and applied to cement pastes made with two types of pozzolanic cements containing natural pozzolana or coal fly ash in order to ascertain the existence of a residual capability of alkali binding by long-term hydrated pozzolanic cements.

Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures

Sharma, "Behaviour of self-compacting concrete using Portland pozzolana cement with different levels of fly ash," Materials and Design, vol.

The Influence of Ground Fly Ash on Cement Hydration and Mechanical Property of Mortar

Blended cement exhibits low porosity as a result of increased amount of secondary cementitious materials due to pozzolana reaction [9].

Chloride Ingress in Chemically Activated Calcined Clay-Based Cement

T4 (peat and pozzolana), presents the most interesting performance parameters (high number of main stems, many major mini-tubers), but with a size and a lower weight.

Influence of several substrates on growth parameters and yield of potato minitubers (Solanum tuberusum)

'Development of sugarcane bagasse ash based Portland pozzolana cement and evaluation of compatibility with superplasticizers' Cement & Concrete Composites, 68: 465-475.

Assessment of sugarcane bagasse ash concrete on mechanical and durability properties

The parent company produces most of the varieties of cement such as OPC, SRC, Oil Well and Pozzolana. OPC constitutes the bulk of the cement sale.

In expansion mode

The cement market is dominated by a handful of producers and suppliers including Ghana Cement, Diamond Cement Group, Pozzolana Cement, Dangote Cement and Savannah Cement.

The housing boom takes hold

Natural pozzolans that are available in different areas of Pakistan and have been evaluated to be used in blended cement include Pozzolana deposits in different areas of Khyber Pakhtoon Khwa i.e., Karak, Mohmand Agency, Swabi and Swat and Laterite deposits in Ziarat area, Sibi, Loralai and Muzaffarabad (Imran et al., 2015; Bukhari et al., 2013; Khan et al., 1984; Shah, 1976 and Usmani, 1969).

A LITERATURE REVIEW ON ALKALI SILICA REACTIVITY OF CONCRETE IN PAKISTAN

It is widely used with these physical characteristics as a light-weight construction material, fill material, insulation material, refractor material, cement pozzolana and absorbent material [7-9].

Usage Possibilities of Diatomite in the Concrete Production for Agricultural Buildings

Al-Rajhi Cement Jordan operates a cement manufacturing plant in Al-Mafraq, Jordan, producing gypsum, limestone, white cement and Pozzolana Portland cement.

Jordan clears the way for Sukuk

In groups of five, Italians seized by SS officers were lined up and shot, at close range, in the Ardeatine Caves, a disused pozzolana quarry on the southeastern outskirts of Rome335 in total.