Which of the following contribute towards the composition of Portland Cement?

$C a O$

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$S i O_{2}$

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$A l_{2} O_{3}$

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$C a C l_{2}$

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Solution

The correct options are
A
$C a O$

B
$S i O_{2}$

C
$A l_{2} O_{3}$

The Average composition of Portland Cement is as follows:

$C a O$ $50 - 60$

$S i O_{2}$ $20 - 25$

$A l_{2} O_{3}$ $5 - 10$

$M g O$ $23$

$F e_{2} O_{3}$ $1 - 2$

$S O_{3}$ $1 - 2$

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