Foundations on Expansive Soil Chapter 4 Quiz
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Questions and Answers

What is the result of water entering between the sheets of the units described in the text?

  • They become stronger
  • They become more rigid
  • They expand readily (correct)
  • They shrink in size

    • Which method is used for the determination of swelling potential in the text?

  • Linear shrinkage test
  • Atterberg limits test
  • Oedometer test (correct)
  • Swell pressure test

    • What percentage of montmorillonite mineral in soils can lead to swelling problems?

  • Exactly 20%
  • Less than 10%
  • More than 20% (correct)
  • Between 10% and 20%

    • What does the activity method determine in the text?

    <p>Crack patterns</p> Signup and view all the answers

    What do diagonal cracks around window and door openings indicate according to the text?

    <p>Foundation movement</p> Signup and view all the answers

    What is the main characteristic of expansive soils?

    <p>They swell when moisture increases and shrink when moisture decreases</p> Signup and view all the answers

    Which mineral is highly expansive among montmorillonite, kaolonite, and illite?

    <p>Montmorillonite</p> Signup and view all the answers

    What is the estimated aerial coverage of expansive soils in Ethiopia?

    <p>24.7 million acres</p> Signup and view all the answers

    What type of structure is particularly susceptible to damage from expansive soils?

    <p>Pavements</p> Signup and view all the answers

    Which type of rock mainly forms montmorillonite?

    <p>Igneous rock</p> Signup and view all the answers

    What causes expansive soils to swell and shrink?

    <p>Change in moisture</p> Signup and view all the answers

    Which natural hazard can expansive soils cause more damage to, according to the text?

    <p>Floods</p> Signup and view all the answers

    What is the main characteristic of montmorillonite mineral?

    <p>Highly expansive</p> Signup and view all the answers

    Which type of rock mainly forms kaolonite and illite minerals?

    <p>Sedimentary rocks</p> Signup and view all the answers

    What is the estimated aerial coverage of expansive soils in Ethiopia?

    <p>24.7 million acres</p> Signup and view all the answers

    What is the result of structures not being designed to withstand the stresses and strains caused by expansive soils?

    <p>Structural cracking</p> Signup and view all the answers

    What is the swelling potential defined as in the text?

    <p>The percentage of swell of a laterally confined sample in an oedometer test under a surcharge load</p> Signup and view all the answers

    What do diagonal cracks around window and door openings indicate according to the text?

    <p>Foundation movement</p> Signup and view all the answers

    What is the most well known example of expansive soils mentioned in the text?

    <p>Black cotton soil</p> Signup and view all the answers

    What is the swelling pressure defined as in the text?

    <p>The pressure required for preventing volume expansion in soil in contact with water</p> Signup and view all the answers

    What is used for the determination of swelling potential according to the text?

    <p>Free swell tests</p> Signup and view all the answers

    What is the relation between the swelling potential of clays and the plasticity index based on the text?

    <p>It is directly proportional</p> Signup and view all the answers

    What does black cotton soil look like?

    <p>Grey to black in color</p> Signup and view all the answers

    What is the structure similar to that of expansive soils according to the text?

    <p>A book with leaves stacked one above the other</p> Signup and view all the answers

    What characteristic causes swelling problems in soils according to the text?

    <p>The percentage of montmorillonite mineral exceeding 20%</p> Signup and view all the answers

    What method provides information on the amount of heaving that is to be anticipated?

    <p>Free swell tests</p> Signup and view all the answers

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