Building Materials
Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded finer than normal cement
Larger proportion of lime grounded finer than normal cement
Excess percentage of gypsum
Lesser proportion of lime grounded coarser than normal cement

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Building Materials
Cast iron

Is obtained by purifying pig iron
All listed here
Is manufactured in required shapes
May contain 2 to 5 per cent of carbon with other impurities

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