Core TradesCâu 10 / 700
During hot-weather concreting, plastic shrinkage cracking is BEST prevented by:
a.Increasing the mixing water to raise the slump
b.Adding an accelerating admixture to speed the set
c.Delaying all curing until the next day
d.Reducing surface moisture loss by shading, wind breaks, and prompt curing
Giải thích
Plastic shrinkage cracks form when the surface dries faster than bleed water rises, so limiting evaporation with shading, wind breaks, fog, and prompt curing is the fix. Adding water weakens the concrete, an accelerator worsens rapid drying, and delaying curing increases moisture loss.
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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