Per §7.2 ('Aggregate Shape and Texture'), under uniaxial compression v…

Question

Per §7.2 ('Aggregate Shape and Texture'), under uniaxial compression vertical cracking in a concrete specimen typically initiates at a stress in the range:

Accepted Answer

C. {'text': 'About 60 to 75 percent of ultimate load', 'label': 'C'}

1. §7.2 (Aggregate Shape and Texture): 'Concrete specimens subjected to uniaxial compression develops vertical cracking at a load of about 60 to 75 percent of the ultimate load.'
2. Angular and rough-textured aggregates push the cracking load higher because of better interlocking and mechanical bond.
_Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.2, p. 46_

Answer

{'text': 'About 10 to 20 percent of ultimate load', 'label': 'A'}

Answer

{'text': 'About 30 to 45 percent of ultimate load', 'label': 'B'}

Answer

{'text': 'About 95 to 99 percent of ultimate load', 'label': 'D'}