Four main oxides present in ordinary Portland cement are $C a O, A l_{2} O_{3} S i O_{2} a n d F e_{2} O_{3} .$ Identify the correct ascending order of their proportions in a typical composition of OPC

A l_{2} O_{3}, F e_{2} O_{3}, C a O, S i O_{2}

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A l_{2} O_{3}, C a O, F e_{2} O_{3}, S i O_{2}

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F e_{2} O_{3}, A l_{2} O_{3}, S i O_{2}, C a O,

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A l_{2} O_{3}, F e_{2} O_{3}, C a O, S i O_{2}

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Solution

The correct option is C $F e_{2} O_{3}, A l_{2} O_{3}, S i O_{2}, C a O,$

Constituents Percentage Average

$1. Lime (C a O)$ 62 - 67% 62%

$2. Silica (S i O_{2})$ 17 - 25% 22%

$3. Alumina (A l_{2} O_{3})$ 3 - 8% 5%

$4. Calcium sulphate (Gypsum) - (C a S O_{4})$ 0.1 - 0.5% 0.3%

$5. Iron oxide (F e_{2} O_{3})$ 0.5 - 6% 3%

$6. Magnesia (M g O)$ 1 - 3% 2 %

$7. Sulphur Trioxide (S O_{3})$ 1 - 3% 1%

$8. Soda & Potash (N a_{2} O + K_{2} O)$ 0.5 - 1.3% 1%

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A l_{2} O_{3}

S i O_{2}

F e_{2} O_{3}

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Constituents	Percentage	Average
$1. Lime (C a O)$	62 - 67%	62%
$2. Silica (S i O_{2})$	17 - 25%	22%
$3. Alumina (A l_{2} O_{3})$	3 - 8%	5%
$4. Calcium sulphate (Gypsum) - (C a S O_{4})$	0.1 - 0.5%	0.3%
$5. Iron oxide (F e_{2} O_{3})$	0.5 - 6%	3%
$6. Magnesia (M g O)$	1 - 3%	2 %
$7. Sulphur Trioxide (S O_{3})$	1 - 3%	1%
$8. Soda & Potash (N a_{2} O + K_{2} O)$	0.5 - 1.3%	1%