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Composition of OPC
Slag cement
setting time

source :tribune.com.pk

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 Introduction: The natural cement is obtained by burning and crushing the stones containing clay, carbonate of lime and some amount of carbonate of magnesia. The clay content in such stones is about 20 to 40 %. The natural cement is brown in colour and its best variety is known as the Roman Cement. The natural cement resembles the eminent hydraulic lime. it sets very quickly after addition of water. It is not so strong as artificial cement and hence it has limited use in practice.The artificial cement is obtained by burning a mixture of specially selected materials at a very high temperature. The mixture of ingredients should be intimate and they should be in correct proportion. The calcined product is known as the clinker. A small quantity of gypsum is added to the clinker and it is then pulverised into very fine powder which is known as the cement.

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