Building Materials
Gypsum is a

Chemically precipitated sedimentary rock
Metamorphic rock
Igneous rock
Mechanically formed sedimentary rock

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Building Materials
Rapid hardening cement attains early strength due to

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

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