Practice Quiz

Civil Engineering PE

Category - Struct. Materials

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What is the required cement content of a concrete mix requiring 295 pounds per cubic yard (lb/yd3) of water, air content of 5%, 28-day compressive strength of 4,000 psi and a water/cement ratio of 0.48?
  1. 141.6 lb/yd3
  2. 614.6 lb/yd3
  3. 1,920 lb/yd3
  4. 8,333 lb/yd3
Explanation
Answer: B - The required cement content of the concrete mix is 614.6 lb/yd3.

Solution: Use the water/cement ratio equation to determine the required cement

Weight of concrete = weight of water / (water/cement ratio)

Given,

Weight of water = 295 lb/yd3

Water/cement ratio = 0.48

Therefore,

Weight of concrete = (295 lb/yd3)/ 0.48 = 614.6 lb/yd3
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