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Give information on percentage proportion of element and mixtures present in Portland cement. |
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Answer» SOLUTION :The average composition of Portland cement is : `CaO:50-60%, SiO_(2):20-25%` `Al_(2)O_(3):5-10%, MgO:2-3%` `Fe_(2)O_(3):1-2%, SO_(3):1-2%` For a good quality cement, the ratio of silica `(SiO_(2))` to alumina `(Al_(2)O_(3))` should be between 2.5 and 4 and the ratio of lime (CaO) to the TOTAL of the oxides of silicon `(SiO_(2))` aluminium `(Al_(2)O_(3))` and iron `(Fe_(2)O_(3))`should be as CLOSE as possible to 2. |
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