Concrete Properties and Admixtures Quiz
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Questions and Answers

What happens to paste strength and stiffness as water/cement ratio (W/C) increases?

  • They decrease (correct)
  • They increase
  • They remain constant
  • They fluctuate
  • How does the shrinkage potential of concrete change with increasing water content?

  • Shrinkage potential increases (correct)
  • Shrinkage potential remains the same
  • Shrinkage potential decreases
  • Shrinkage potential fluctuates
  • How do larger concrete members affect the duration of shrinkage compared to smaller members?

  • The duration is shorter for larger members
  • The duration fluctuates based on member size
  • The duration is the same for all members
  • The duration is longer for larger members (correct)
  • What type of shrinkage occurs before concrete has set?

    <p>Plastic shrinkage</p> Signup and view all the answers

    Which factor influences the rate of shrinkage in concrete?

    <p>Degree of compaction</p> Signup and view all the answers

    What does concrete with a higher aggregate content exhibit in terms of shrinkage?

    <p>Smaller shrinkage</p> Signup and view all the answers

    Which factor affects the resistance of concrete to the shrinkage process?

    <p>Aggregate roughness</p> Signup and view all the answers

    What is the main purpose of using admixtures like accelerator, retarder, or plasticizer in concrete?

    <p>Adjust the setting time or improve workability of concrete</p> Signup and view all the answers

    What happens to the deformation of concrete under sustained loading over time?

    <p>It increases slowly and then decreases as time passes</p> Signup and view all the answers

    Why is achieving low permeability in concrete important?

    <p>To protect embedded steel against corrosion and increase durability</p> Signup and view all the answers

    What are the factors influencing the permeability of concrete?

    <p>Water/Cement Ratio, Curing, and Strength Testing</p> Signup and view all the answers

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