Core TradesCâu 124 / 700
Assuming proper placement and curing, which change to a concrete mix will produce the GREATEST increase in compressive strength?
a.Adding extra mixing water to improve workability
b.Lowering the water-cement ratio
c.Increasing the slump
d.Adding more fine aggregate
Giải thích
Compressive strength is governed primarily by the water-cement ratio; a lower ratio yields a denser, stronger cement paste. Adding water or increasing slump raises the water-cement ratio and weakens the concrete. Adding fine aggregate changes gradation and workability but does not directly increase strength.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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