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Composition and Manufacture and Uses of Cement

The average c...

Question

The average composition of Portland cement is:

C a O : 40 - 50 %

S i O_{2} : 30 - 40 %

A l_{2} O_{3}

and

F e_{2} O_{3} : 10 - 20 %

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C a O : 50 - 60 %

S i O_{2} : 20 - 25 %

A l_{2} O_{3} : 5 - 10 %

M g O : 2 - 3 %, F e_{2} O_{3} : 1 - 2 %

and

S O_{3} : 1 - 2 %

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S i O_{2} : 40 - 50 %

C a O : 30 - 40 %

A l_{2} O_{3} : 10 - 20 %

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C a O : 50 %

S i O_{2} : 50 %

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Solution

The correct option is C $C a O : 50 - 60 %$ , $S i O_{2} : 20 - 25 %$ , $A l_{2} O_{3} : 5 - 10 %$ , $M g O : 2 - 3 %, F e_{2} O_{3} : 1 - 2 %$ and $S O_{3} : 1 - 2 %$
Port land cement consists of raw materials mainly compounds of lime mixed with silica and alumina.
$C a O \to 50 - 60$ %
$S i O_{2} \to 20 - 25$ %
$A l_{2} O_{3} \to 5 - 10$ %
$F e_{2} O_{3} \to 1 - 2$ %
$M g O \to 2 - 3$ %
$S O_{3} \to 1 - 2$ %
and few amount of oxides of iron, magnesium and sulphur.

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Similar questions

A l_{2} O_{3}

S i O_{2}

F e_{2} O_{3}

Among $A l_{2} O_{3}, S i O_{2}, P_{2} O_{3}, a n d S O_{3}$ , the correct order of acid strength is:

S i O_{2} + C a O \to C a S i O_{3}

F e O + S i O_{2} \to F e S i O_{3}

C a O + P_{2} O_{5} \to C a_{3} (P O_{4})_{2}

C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r

M g C O_{3} + S i O_{2} \to M g S i O_{3} + C O_{2}

:

X	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$
F	$5$	$4$	$3$	$2$	$1$

A l_{2} O_{3}, S i O_{2}, P_{2} O_{3}, S O_{2}

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