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How is the distribution of particle sizes larger than 75 μm determined?
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?
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?
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?
What does the use of air dispersion devices produce, according to the text?
Why is the use of air dispersion recommended, according to the text?
Why is the use of air dispersion recommended, according to the text?
What is the function of apparatus A mentioned in the text?
What is the function of apparatus A mentioned in the text?
Which balance is used for weighing the material retained on a No. 10 sieve?
Which balance is used for weighing the material retained on a No. 10 sieve?
What is the purpose of the stirring apparatus mentioned in the text?
What is the purpose of the stirring apparatus mentioned in the text?
What is the purpose of Balances mentioned in the text?
What is the purpose of Balances mentioned in the text?
What does the air-jet dispersion cup mentioned in the text consist of?
What does the air-jet dispersion cup mentioned in the text consist of?
What does ASTM D 422 standard test method cover?
What does ASTM D 422 standard test method cover?
What is the purpose of the hydrometer mentioned in the text?
What is the purpose of the hydrometer mentioned in the text?
Why is the use of air dispersion recommended, according to the text?
Why is the use of air dispersion recommended, according to the text?
How is the distribution of particle sizes larger than 75 μm determined?
How is the distribution of particle sizes larger than 75 μm determined?
What is the purpose of the ASTM hydrometer mentioned in the text?
What is the purpose of the ASTM hydrometer mentioned in the text?
What is the function of apparatus A mentioned in the text?
What is the function of apparatus A mentioned in the text?
What is the purpose of Balances mentioned in the text?
What is the purpose of Balances mentioned in the text?
Which balance is used for weighing the material retained on a No. 10 sieve?
Which balance is used for weighing the material retained on a No. 10 sieve?
What does the air-jet dispersion cup mentioned in the text consist of?
What does the air-jet dispersion cup mentioned in the text consist of?
What is the use of air dispersion devices recommended for, according to the text?
What is the use of air dispersion devices recommended for, according to the text?
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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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