Match the average fundamental compounds with their proper percentage present in Portland cement.
Compound Percentage proportion $1. CaO$ $d. 50-60\%$ $2. Al_2O_3$ $a. 5-10\%$ $3. SO_3$ $b. 1-3\%$
| Compound | Percentage proportion |
| $1. CaO$ | $d. 50-60\%$ |
| $2. Al_2O_3$ | $a. 5-10\%$ |
| $3. SO_3$ | $b. 1-3\%$ |
(C) The composition of Portland cement is approximately:
$CaO$: $50-60\%$
$SiO_2$: $20-25\%$
$Al_2O_3$: $5-10\%$
$MgO$: $2-3\%$
$Fe_2O_3$: $1-2\%$
$SO_3$: $1-3\%$
Therefore,the correct matching is $1-d, 2-a, 3-b$.
$CaO$: $50-60\%$
$SiO_2$: $20-25\%$
$Al_2O_3$: $5-10\%$
$MgO$: $2-3\%$
$Fe_2O_3$: $1-2\%$
$SO_3$: $1-3\%$
Therefore,the correct matching is $1-d, 2-a, 3-b$.
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