Core TradesQuestion 166 of 700
Holding cement content and curing constant, which change to a concrete mix will generally produce the HIGHEST compressive strength?
a.Lowering the water-to-cement ratio
b.Adding more mixing water for easier placement
c.Increasing the slump
d.Using rounded aggregate instead of angular aggregate
Explanation
Compressive strength is governed mainly by the water-to-cement ratio; lowering it produces a denser, stronger paste. Adding water or increasing slump raises the water-to-cement ratio and weakens the concrete. Aggregate shape affects workability but is not the primary strength driver.
Law Reference: 2025 CA Building Code, Chapter 19 (Concrete) per ACI 318Practice all 700 questions free — no signup required.
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