Web Definition: Portland Cement
Portland cement is the most common type of cement in general usage, as it is a basic ingredient of concrete & mortar. It consists of a mixture of oxides of calcium, silicon & aluminum. Portland cement & similar materials are made by heating limestone with clay or sand & grinding the product. The resulting powder, when mixed with water, will become a hydrated solid over time. Manufacture of portland cement requires the burning of large quantities of fuel, typically coal, which along with impurities contained in the limestone can result in significant emissions of pollutants regulated in many countries, including greenhouse gases such as nitrogen oxides & sulfur dioxide, as well as particulates, volatile organic compounds & carbon monoxide. Cement plants are known to emit substantial quantites of arsenic, lead & mercury. Portland cement was first manufactured in Britain in the early part of the 19th century & its name is derived from its similarity to Portland Stone, a type of building stone that was quarried on the Isle of Portland in Dorset, England.
Read More »Dictionary Entry: A cement having the color of the Portland stone of England, made by calcining an artificial mixture of carbonate of lime and clay, or sometimes certain natural limestones or chalky clays. It contains a large proportion of clay, and hardens under water.
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