ASTM D422 Soil Particle-Size Analysis Quiz and Flashcards

Questions and Answers

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

By sieving

What does ASTM D 422 standard test method cover?

Quantitative determination of the distribution of particle sizes in soils

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

To measure the particle size distribution

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

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

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

It provides definite advantages favoring air dispersion Signup and view all the answers

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

To hold the sample while it is being dispersed Signup and view all the answers

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

Sensitive to 0.1 % of the mass of the sample Signup and view all the answers

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

To disperse the sample Signup and view all the answers

What is the purpose of Balances mentioned in the text?

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

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

An air-jet dispersion cup and an air compressors Signup and view all the answers

What does ASTM D 422 standard test method cover?

Quantitative determination of particle sizes in soils Signup and view all the answers

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

To secure necessary data for particle size analysis Signup and view all the answers

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

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

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

By sieving using a No. 200 sieve Signup and view all the answers

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

To measure the specific gravity of the suspension Signup and view all the answers

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

To stir the sample with a mechanically operated stirring device Signup and view all the answers

What is the purpose of Balances mentioned in the text?

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

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

A balance sensitive to 0.1 % of the mass of the sample Signup and view all the answers

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

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

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

For eliminating the need for transferring the slurry 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.