Building Materials
The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:

Twisted fibres
Heart shakes
Radial shakes
Wind cracks

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Building Materials
When a brick is immersed in water for 24 hours and then dried, if

50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
No grey or white deposits appear on the surface, the brick is free from soluble salts
All listed here

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Building Materials
Rapid hardening cement attains early strength due to

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

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