Portland Cement


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Related to Portland Cement: White Portland cement

portland cement

[′pȯrt·lənd si′ment]
(materials)
A hydraulic cement made of pulverized, calcined argillaceous and calcareous materials; the proper name for ordinary cement.

Portland cement

Building material made from limestone, gypsum, and shale or clay that, when mixed with water, binds sand and gravel into concrete. Portland cement was invented in 1824 by Joseph Aspdin, a British stone mason, who named it after a natural stone quarried on the Isle of Portland off the British coast.

Portland Cement

 

a hydraulic binder composed chiefly of calcium silicates. The most widely used cement in modern construction, Portland cement is obtained by pulverizing clinker with gypsum (3–7 percent); active mineral additives (10–15 percent) may be added to the mixture. Clinker is produced upon calcination (to the point of complete sintering) of an artificial mixture of raw materials containing approximately 75 percent calcium carbonate, usually limestone, and 25 percent clay. The raw material is generally calcined in rotary kilns at 1450°-1500°C.

The properties of portland cement depend mainly on the clinker composition and on the degree to which the clinker is pulverized. The most important property of portland cement is its ability to harden upon interaction with water. This property is reflected in the grade of portland cement, which is determined by the compressive and bending (tensile) strengths of standard specimens made from a sand-cement solution after a 28-day setting period under humid conditions; grades of portland cement from 300 to 600 have been established in the USSR.

In addition to ordinary portland cement, other varieties are produced, which differ in composition, properties, and use. They include quick-setting, plastic, hydrophobic, sulfate-resistant and white portland cements, as well as a special type for use in the manufacture of asbestos-cement articles.

REFERENCES

Volzhenskii, A. V., Iu. S. Burov, and V. S. Kolokol’nikov. Mineral’nye viazhushchie veskchestva, 2nd ed. Moscow, 1973.

K. N. POPOV

portland cement

A cementitious binder used in most modern structural concrete; manufactured by grinding and burning a mixture of limestone with clay or shale with a small amount of gypsum. It is mixed with water and an aggregate (such as sand and/or gravel) to form a thick, heavy liquid that dries as a monolithic product. Although cement was developed by the ancient Romans, portland cement was first developed in England in 1824; since then, its tensile strength has greatly increased.
References in periodicals archive ?
A disadvantage of Portland cement is that it has lower radio-opacity and the main advantage is its very low cost.
The median particle size of ash was much bigger than that of Portland cement type I.
Substantial replacement of Portland cement with reclaimed fly ash or slag dramatically reduces the greenhouse gases associated with concrete production.
For California Portland Cement, protecting the environment through sound energy management is a major priority," said Jim Repman, CEO, California Portland Cement.
Portland cement contains silica, and respirable crystalline silica, created when cutting or drilling through cement, has been implicated in silicosis-related death and disease among construction workers.
Cement and Concrete Reference Laboratory Proficiency Sample Program: Final Report Portland Cement Proficiency Samples Number 133 and 134, Cement and Concrete Reference Laboratory, Gaithersburg, MD, September 1999.
California Portland Cement, which also was among the first commercial customers to exercise customer choice in California, has been a New West Energy customer since California's electricity market opened its doors to competition in spring 1998.
WHAT: FLASH, the Portland Cement Association (PCA), the Insurance Information Institute and project partners will gather for a groundbreaking event/rebuilding kickoff at the Hellriegel family home that was destroyed by Superstorm Sandy.
Fracture properties and rigidity can hinge on volume adjustments of three common salts in conjunction with the pyroprocessing behind portland cement and glass.
12, 2014 /PRNewswire/ -- Research and Markets has announced the addition of the "Global Portland Cement Market for Residential, Commercial, Infrastructure and Other Applications (Bricks, Farm Construction) - Trends and Forecast to 2020" report to their offering.
The Portland Cement Company's workers' protest in February 2013

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