Core TradesQuestion 70 of 700
A concrete supplier delivers a load with a measured slump much higher than ordered. Before rejecting or accepting, the BEST assumption about the likely cause and its effect is:
a.High slump means higher strength, so accept it
b.Slump does not affect the finished concrete
c.The load is too stiff and needs vibration
d.Water was likely added on site, which raises the water-cement ratio and can reduce strength and durability
Explanation
An unexpectedly high slump usually means water was added, increasing the water-cement ratio and lowering strength and durability. High slump does not indicate higher strength; slump affects workability and quality; a high slump is fluid, not stiff. Field-added water beyond the design must be evaluated before acceptance.
Law Reference: 2025 CA Building Code, Chapter 19 (Concrete)Practice all 700 questions free — no signup required.
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