Portland cement is manufactured by using:

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(D) . The raw materials used for the manufacture of Portland cement are limestone $(CaCO_3)$,which provides lime,and clay,which provides silica $(SiO_

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Lime stone,clay and gypsum

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(D) . The raw materials used for the manufacture of Portland cement are limestone $(CaCO_3)$,which provides lime,and clay,which provides silica $(SiO_2)$,alumina $(Al_2O_3)$,and iron oxide $(Fe_2O_3)$. Gypsum $(CaSO_4 \cdot 2H_2O)$ is added in small quantities (about $2-3 \%$) to the clinker during grinding to retard the setting time of the cement.

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