The average composition of portland cement is

1.	The average composition of portland cement is
Answer» `CaO:40-50%,SiO_(2):30-40%,Al_(2)O_(3),Fe_(2)O_(3):10-20%` `CaO:50-60%,SiO_(2):20-25%,Al_(2)O_(3):5-10%,MgO:2-3%,Fe_(2)O_(3):1-2% and SO_(3):1-2%` `SiO_(2):40-50%,CaO:30-40%,Al_(2)O_(3):10-20%` `CaO:50%,SiO_(2):50%` Answer :B

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