What Is a Proctor Soil Test?

Save

Proctor soil tests are performed in laboratories to discover the maximum dry unit weight as well as the optimum moisture content, or the overall density, of soil. There are two types of proctor tests---standard and modified. During the test, the soil is compacted into a standard mold using various methods that depend on the type of soil.

Different Types of Proctor Tests

  • The standard proctor test uses 1/30 cubic foot of soil in a 4-inch diameter mold that compacts three separate lifts of soil with 25 blows by a 5.5-lb. hammer with a fall of 12 inches. The modified test uses the same mold with a 10-lb. hammer delivering 25 blows with a fall of 18 inches.

Purpose of Proctor Tests

  • The tests determine the maximum achievable density for different soils and are used mostly in geotechnical engineering.

Soil Compaction

  • Compaction is how soil density increases when air is driven out of the soil.

Types of Tools Used

  • Various types of rollers, depending on the type of soil--for example, gravel, sand or clay--compact the soil after the proctor test is performed. Rubber-tired and vibratory rollers are two types of tools used.

Purpose of Knowing Soil Density

  • Soil density is key to various engineering projects, such as building roads and parking lots.

References

  • Photo Credit cracked soil image by Ana de Sousa from Fotolia.com
Promoted By Zergnet

Comments

You May Also Like

  • Test Proctor Job Description

    Test proctor and test administrator jobs involve facilitating the testing of large numbers of students at high schools, colleges, universities, professional testing...

  • How to Get a Job Proctoring an SAT Test

    Proctoring an SAT test is a part-time position that is typically available only to adults with a high school diploma. Usually, it's...

  • How to Calculate the Soil Compaction Factor

    Proper soil compaction ensures that things stay in place after they are built. Whether it's an underground pipe, a sidewalk, a home,...

  • How to Find an Exam Proctor

    Many college students are required to designate proctors to administer exams, especially those who take courses online and do not live near...

  • Soil Compaction Testing Methods

    Whether you want to cultivate a lush backyard garden or construct an addition to your home, soil compaction is an important factor...

  • Moisture Testing Method for Soils

    An ordinary moisture probe, commonly available at hardware stores, provides a useful moisture testing method for soils, although you can also look...

Related Searches

Check It Out

How to Make a Vertical Clay Pot Garden

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!