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Cement is made from limestone and clay in a powder form. Manufacturing of cement has started in 1904 in India. Portland Cement is generally referred to as Ordinary Portland Cement (OPC) in our country.
The main ingredients used in the manufacturing of cement are lime, silica, alumina and other oxides. A brief discussion about the contribution of different ingredients in cement is below:
About 60 - 65 % of cement constitutes of lime which contributes to the strength. Proper care should be taken in proportion to make the cement sound and strong, as an excess of lime makes the cement unsound and causes the cement to expand and disintegrate. In case, if lime is deficient, the strength of the cement is reduced and sets quickly.
Silica consists of about 17 - 25 % in cement, which also contributes to the strength of cement due to the formation of dicalcium and tricalcium silicates. Excess presence of silica increases the cement strength but prolongs the setting time of cement.
The percentage of alumina is 3.5 - 9.0 in cement, which imparts quick-setting quality to the cement. Surplus amount of alumina presence in cement leads to the reduction of strength.
Iron oxide is present about 0.5 - 6.0 % in cement, which provides colour, hardness and strength to the cement.
The correct quantity of magnesium oxide imparts hardness and colour to the cement, and the required amount is about 0.5 - 4.0 %. Presence of excess quantity seriously affects the soundness of cement.
It is present in small quantities of about 1 - 2.0 % to make the cement sound. Excess of sulphur trioxide causes the cement to become unsound.
Alkalis like soda or potash should be present only in small quantities up to 0.4 - 1.3 %. Excess quantity of these materials cause efflorescence and straining while using in concrete or mortar.
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Technically Reviewed by Rajesh Pagadala, MS, Founder & CEO - BuildersMart. Written by Vani paspula, Content Manager.
Derib Admasu
posted on Feb 25, 2021 5:55:53 PM