Core TradesCâu 3 / 700
During hot-weather placement with a long haul time, a set-retarding admixture is used mainly to:
a.Increase the concrete's final compressive strength
b.Delay setting so the concrete stays workable longer
c.Permanently reduce the water needed in the mix
d.Provide freeze-thaw protection in cold climates
Giải thích
A retarder slows the hydration reaction so fresh concrete remains workable during long hauls or hot weather. It does not raise final strength, is not a water reducer, and offers no freeze-thaw benefit.
Trích dẫn luật: 2025 CA Building Code (CBC) Chapter 19 (Concrete)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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