Core TradesCâu 121 / 700
Under normal ambient conditions, what is the MINIMUM period that standard structural concrete should be kept continuously moist to develop adequate strength and durability?
a.24 hours
b.3 days
c.7 days
d.28 days
Giải thích
Cement hydration continues only while moisture is present, so a continuous moist-cure of at least 7 days is the common minimum for standard mixes. 24 hours and 3 days stop hydration too early and reduce strength and surface durability. 28 days is the age at which design strength is typically verified, not the required curing duration.
Trích dẫn luật: 2025 CA Building Code, Chapter 19 (Concrete)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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