Give the composition of Portland cement.
(N/A) The average composition of Portland cement is as follows:
$CaO: 50-60 \%$,$SiO_{2}: 20-25 \%$,$Al_{2}O_{3}: 5-10 \%$
$MgO: 2-3 \%$,$Fe_{2}O_{3}: 1-2 \%$,$SO_{3}: 1-2 \%$
$CaO: 50-60 \%$,$SiO_{2}: 20-25 \%$,$Al_{2}O_{3}: 5-10 \%$
$MgO: 2-3 \%$,$Fe_{2}O_{3}: 1-2 \%$,$SO_{3}: 1-2 \%$
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