Portland Cement


Also found in: Dictionary, Thesaurus, Wikipedia.
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 ?
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.
In the two-dimensional image, particle sizes are observed to range between several micrometers and about 100 [micro]m, as is typical of most portland cements (9).
New West Energy has been working with California Portland Cement, Sixth Dimension and the ISO since June in an effort to implement the program.
In portland cement, alite is the chemical compound that is primarily responsible for the onset of early strength.
Better understanding of Portland cement hydration can absolutely promote the performance of cement composites under low temperatures, especially for the application at cold climates.
Furthermore, increasing demand for materials such as concrete, mortar, stucco and grout, which utilize portland cement as a key ingredient, is also catalyzing the growth of the industry.
It is time to wind up Portland Cement. Why keep flogging a dead horse?
The plant capacity will be 1.2 million tons of Portland cement per year, according to the document.
The production of these coatings requires numerous raw materials, including Portland cement, several other cement grades, and polymers (such as acrylic polymers and its derivatives and SBR latex).
Lime, kaolin, Portland cement and bentonite can prevent ruminal acidosis, since these are alkalinizing agents, causing stability of pH in the rumen and increasing nutrient consumption (Pina et al., 2010) and digestibility.
The White Portland Cement used in our study belongs to calcium-silicates chemical group and shown bioactivity similar to Bioglass 45S5 system [23, 37].
Eng Idris bin Hassan al Sinan, civil engineer at the Conformity Department, said that there are many types of cement, the most common of which is Portland cement used in the construction industry.

Full browser ?