Pozzolana


Also found in: Dictionary, Wikipedia.
Related to Pozzolana: fly ash

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.

References in periodicals archive ?
Raw material : procurement of 5,000mt plus or minus 30 percent in bulkers and 1,000mt plus or minus 30 percent in bags portland pozzolana cement (ppc) as per is 1489 part-i to 2x500mw, ntpc mauda fgd, maharashtra on f.O.R.
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.
Sharma, "Behaviour of self-compacting concrete using Portland pozzolana cement with different levels of fly ash," Materials and Design, vol.
Blended cement exhibits low porosity as a result of increased amount of secondary cementitious materials due to pozzolana reaction [9].
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.
'Development of sugarcane bagasse ash based Portland pozzolana cement and evaluation of compatibility with superplasticizers' Cement & Concrete Composites, 68: 465-475.
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.
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.
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).
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].
Al-Rajhi Cement Jordan operates a cement manufacturing plant in Al-Mafraq, Jordan, producing gypsum, limestone, white cement and Pozzolana Portland cement.
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.