Building Materials
Rapid hardening cement attains early strength due to

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

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Building Materials
Cast iron

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

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