Core TradesQuestion 129 of 700
Standard-cured concrete test cylinders are most commonly broken to verify that the specified compressive strength (f'c) has been reached at what age?
a.7 days
b.14 days
c.56 days
d.28 days
Explanation
The specified compressive strength f'c is conventionally verified at 28 days, when the majority of strength gain has occurred. 7-day breaks are used as an early indicator only. 14 and 56 days are not the standard verification age for typical structural concrete.
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