Building Materials
Seasoning of timber is essential to remove

Roughness of timber
Sap from timber
Twisted fibre from timber
Knots from timber

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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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