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Old 04-01-2002, 03:47 PM   #2
flatfloor
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Portland Cement

Portland cement: A cement consisting predominantly of calcium silicates which reacts with water to form a hard mass.

In 1824 Joseph Aspdin of England invented portland cement by burning finely ground chalk with finely divided clay in a lime kiln until carbon dioxide was driven off. The sintered product (cause to become a coherent mass by heating without melting) was then ground and he called it portland cement named after the high quality building stones quarried at Portland, England.

Portland cement today, as in Aspdin's day, is a predetermined and carefully proportioned chemical combination of calcium, silicon, iron, and aluminum. Natural cement gave way to portland cement, which is a predictable, known product of consistently high quality.

Types of Portland Cement
Type 1
normal portland cement. Type 1 is a general use cement.

Type 2
is used for structures in water or soil containing moderate amounts of sulfate, or when heat build-up is a concern.

Type 3
high early strength. Used when high strength are desired at very early periods.

Type 4
low heat portland cement. Used where the amount and rate of heat generation must be kept to a minimum.

Type 5
Sulfate resistant portland cement. Used where the water or soil is high in alkali.

Types IA, IIA and IIIA are cements used to make air-entrained concrete. They have the same properties as types I, II, and III, except that they have small quantities of air-entrained materials combined with them.

http://www.concretenetwork.com/concr...tis/index.html
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