CE 221-Construction Materials and Testing: Aggregates and Size Variation
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Questions and Answers

What is the recommended proportion of cement, sand, and coarse aggregates in the method described?

  • 1n:2n (correct)
  • 1:1:2
  • 1:3:6
  • 1:1:3

    • Why is very coarse sand or very fine sand considered unsatisfactory for making concrete?

  • They lead to lower strength concrete
  • They are difficult to mix with cement
  • They require more water for fluidity (correct)
  • They result in harsh bleeding and segregation

    • What impact does the grading of fine aggregates have on the workability of concrete?

  • Significant impact (correct)
  • Slight improvement
  • No impact
  • Increased strength

    • Why is crushed sand becoming more popular in the concrete industry?

    <p>Natural sand is becoming scarce and expensive</p> Signup and view all the answers

    What type of sand is recommended for good workability in concrete?

    <p>Rounded and smooth textured sand</p> Signup and view all the answers

    Which mix is suitable for use in foundations?

    <p>1:3:6</p> Signup and view all the answers

    What is the main disadvantage of using ordinary crushed sand in concrete production?

    <p>Harsh concrete due to rough texture</p> Signup and view all the answers

    Why is the grading of natural fine sand not always ideal?

    <p>Depends on location</p> Signup and view all the answers

    What characterizes natural fine sand that makes it preferable for concrete work?

    <p>Cubical or rounded with smooth surface texture</p> Signup and view all the answers

    Which type of mix is recommended for use in columns and beams?

    <p>1:1:2 M250</p> Signup and view all the answers

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