Reinforced Cavity Wall Construction Quiz
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Questions and Answers

What is the expected grade/strength of infill concrete in a reinforced cavity wall?

  • 15 MPa (correct)
  • Answer available to our clients only
  • 10 MPa
  • 5 MPa
  • Can you use cement bricks to lift the surface bed rebar/mesh as long as the bricks are cut in half?

  • True (correct)
  • Answer available to our clients only
  • False
  • Makes no difference
  • Within what duration should mortar be used after mixing?

  • 3 Hours
  • Answer available to our clients only
  • 4 Hours
  • 1 Hour (correct)
  • What should be done with mortar in which initial set has occurred (i.e., thumbprint hard)?

    <p>Used within two hours of mixing</p> Signup and view all the answers

    By how much should a masonry wall not overhang the concrete slab of raft foundations?

    <p>30mm</p> Signup and view all the answers

    Which of the following bricks should be wetted before placed?

    <p>Concrete bricks</p> Signup and view all the answers

    What should the grading of mortar be in hollow bricks used for cavity wall foundations?

    <p>1.0 Mpa &amp; 10.0 Mpa</p> Signup and view all the answers

    What is the average compressive strength of the hollow and solid masonry units required for single storey buildings?

    <p>7.0 MPa and 10.0 MPa</p> Signup and view all the answers

    What is the average compressive strength of the hollow and solid masonry units required for the lower storey in double storey buildings?

    <p>3.0 MPa and 7.0 MPa</p> Signup and view all the answers

    What is the average compressive strength for the solid masonry units for a double storey construction?

    <p>15 MPa</p> Signup and view all the answers

    What is the minimum difference in ground levels (h) for a 110-110 cavity retaining wall?

    <p>1200 mm</p> Signup and view all the answers

    What is the maximum height of a masonry foundation wall where the fill is retained behind a 220mm nominal wall thickness?

    <p>The text does not specify a maximum height for this scenario.</p> Signup and view all the answers

    What is the recommended minimum compressive strength for concrete infill in cavity wall construction?

    <p>20 MPa</p> Signup and view all the answers

    Which type of mortar is typically used for laying masonry units in wall construction?

    <p>Cement mortar</p> Signup and view all the answers

    Can cement bricks be used as a substitute for lifting bed reinforcement in masonry wall construction?

    <p>No, steel reinforcement is mandatory and cannot be substituted.</p> Signup and view all the answers

    What is the maximum size of rock or hard fragments allowed in backfill material for masonry wall construction?

    <p>50 mm</p> Signup and view all the answers

    What is the minimum horizontal spacing requirement between a water pipe and a sewer line when laid underground?

    <p>600 mm</p> Signup and view all the answers

    What is the recommended minimum slab thickness for a non-load-bearing masonry wall?

    <p>250 mm</p> Signup and view all the answers

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