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 ?
35 billion tons of Portland cement are made each year.
The aim of this review is to evaluate the dental literature concerning MTA materials and Portland cement.
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.
John Harrison, a technologist from Tasmania, has developed a cement using magnesium carbonate instead of the calcium carbonate used for Portland cement.
He says the physical characteristics of papercrete vary widely, depending upon the relative amounts of sand and Portland cement used.
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.
New West Energy's customer, California Portland Cement, successfully passed a series of tests that confirmed the ISO received real-time meter readings and dispatch signals from power meters installed at customer locations.
Some stabilizing structural steel components are incorporated, as is three per cent Portland cement.
Ohio-based adhesive, sealant, gel and coating specialist Silicone Solutions plans a 2018 World of Concrete launch for a nano-silica admixture that effectively converts Types I and II portland cement to a Type IV low heat binder.
Tenders are invited for work includes approx 1 ls traffic control; 21 sy removal of existing pavements, sidewalks and driveways; 1 ea removal of storm sewer structures; 1 ea storm sewer intake; 13 sy portland cement concrete pavement, non-reinforced; 9 sy portland cement concrete driveway, (6" depth pcc on 6" granular subbase); 70 sf sodding.

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