Building Materials
Rapid hardening cement attains early strength due to

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

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Building Materials
In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride
Low-molecular substances are removed from the high molecular substance
All of these
The reaction proceeds with an evolution of ammonia

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