Core TradesCâu 129 / 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
Giải thích
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.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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