ASTM D422-63 (Reapproved 2002) Soil Particle-Size Analysis Quiz
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Questions and Answers

How is the distribution of particle sizes larger than 75 μm determined?

  • By sedimentation process
  • By air dispersion
  • By sieving (correct)
  • By using a hydrometer

    • What does ASTM D 422 standard test method cover?

  • Qualitative determination of soil permeability
  • Quantitative determination of soil color
  • Qualitative determination of the distribution of particle sizes in soils
  • Quantitative determination of the distribution of particle sizes in soils (correct)

    • What is the purpose of the ASTM hydrometer mentioned in the text?

  • To measure the particle size distribution (correct)
  • To determine the soil type
  • To weigh the material retained on a No. 10 sieve
  • To remove the water from air lines

    • What does the use of air dispersion devices produce, according to the text?

    <p>More positive dispersion of plastic soils below the 20-μm size</p> Signup and view all the answers

    Why is the use of air dispersion recommended, according to the text?

    <p>It provides definite advantages favoring air dispersion</p> Signup and view all the answers

    What is the function of apparatus A mentioned in the text?

    <p>To hold the sample while it is being dispersed</p> Signup and view all the answers

    Which balance is used for weighing the material retained on a No. 10 sieve?

    <p>Sensitive to 0.1 % of the mass of the sample</p> Signup and view all the answers

    What is the purpose of the stirring apparatus mentioned in the text?

    <p>To disperse the sample</p> Signup and view all the answers

    What is the purpose of Balances mentioned in the text?

    <p>To weigh the material retained on a No. 10 sieve</p> Signup and view all the answers

    What does the air-jet dispersion cup mentioned in the text consist of?

    <p>An air-jet dispersion cup and an air compressors</p> Signup and view all the answers

    What does ASTM D 422 standard test method cover?

    <p>Quantitative determination of particle sizes in soils</p> Signup and view all the answers

    What is the purpose of the hydrometer mentioned in the text?

    <p>To secure necessary data for particle size analysis</p> Signup and view all the answers

    Why is the use of air dispersion recommended, according to the text?

    <p>It produces a more positive dispersion of plastic soils below the 20-μm size</p> Signup and view all the answers

    How is the distribution of particle sizes larger than 75 μm determined?

    <p>By sieving using a No. 200 sieve</p> Signup and view all the answers

    What is the purpose of the ASTM hydrometer mentioned in the text?

    <p>To measure the specific gravity of the suspension</p> Signup and view all the answers

    What is the function of apparatus A mentioned in the text?

    <p>To stir the sample with a mechanically operated stirring device</p> Signup and view all the answers

    What is the purpose of Balances mentioned in the text?

    <p>To weigh the material retained on a No. 10 sieve</p> Signup and view all the answers

    Which balance is used for weighing the material retained on a No. 10 sieve?

    <p>A balance sensitive to 0.1 % of the mass of the sample</p> Signup and view all the answers

    What does the air-jet dispersion cup mentioned in the text consist of?

    <p>An air-jet dispersion cup conforming to general details and requiring air supply</p> Signup and view all the answers

    What is the use of air dispersion devices recommended for, according to the text?

    <p>For eliminating the need for transferring the slurry</p> Signup and view all the answers

    Study Notes

    Particle Size Distribution

    • The distribution of particle sizes larger than 75 μm is determined by sieving.

    ASTM D 422 Standard Test Method

    • The ASTM D 422 standard test method covers the determination of particle-size distribution of soils.

    ASTM Hydrometer

    • The ASTM hydrometer is used to determine the particle-size distribution of finer particles, typically smaller than 75 μm.
    • The purpose of the ASTM hydrometer is to measure the density of the soil suspension.

    Air Dispersion Devices

    • The use of air dispersion devices produces a uniform dispersion of particles.
    • The use of air dispersion is recommended to break down agglomerates and ensure a uniform dispersion of particles.

    Apparatus A

    • Apparatus A is used to disaggregate the soil particles.

    Balances

    • The purpose of balances is to weigh the material retained on a No. 10 sieve.
    • A balance is used to weigh the material retained on a No. 10 sieve.

    Stirring Apparatus

    • The purpose of the stirring apparatus is to mix the soil suspension.

    Air-Jet Dispersion Cup

    • The air-jet dispersion cup consists of a cup and an air jet nozzle that disperses the particles.

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    Description

    Test your knowledge of the ASTM D422-63 (Reapproved 2002) standard test method for particle-size analysis of soils with this quiz. Explore the scope, procedures, and applications of this test method.

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