The Proctor Compaction Test establishes the maximum unit weight that a particular type of soil can be compacted to using a controlled compactive force at an optimum water content.

What is Proctor in soil testing?

The Proctor Compaction Test establishes the maximum unit weight that a particular type of soil can be compacted to using a controlled compactive force at an optimum water content.

What is the purpose of Proctor test?

The Proctor test measures soil compaction to determine the point at which soils can most efficiently be compacted using construction equipment, based on their optimal moisture content and maximum dry weight.

How do you do a soil Proctor test?

The procedure of the Proctor Compaction Test consists of the following steps:

  1. Obtain about 3 kg of soil.
  2. Pass the soil through the No.
  3. Weight the soil mass and the mold without the collar (Wm).
  4. Place the soil in the mixer and gradually add water to reach the desired moisture content (w).
  5. Apply lubricant to the collar.

What is Proctor value of soil?

The Proctor compaction test provides a standardized method of determining a soil’s resistance to compaction over a range of soil water contents under a constant value of compaction energy. The optimum water content (OWC) is the amount of water required to produce a maximum dry density (MDD) from the test procedure.

Why is Proctor compaction test important?

Standard Proctor test or Proctor compaction test establishes the variation of the unit weight of soil and degree of compaction with the moisture content. It also helps us find out the optimum moisture content for the highest practical density.

What are the purpose of compaction on site?

3.1 Purpose of Compaction Compaction increases the shear strength of the soil. through soil. This is important if the soil is being used to retain water such as would be required for an earth dam. Compaction can prevent the build up of large water pressures that cause soil to liquefy during earthquakes.

What does 95% compaction mean?

95 percent compaction means that the soil has been compacted to 95 percent of the possible density of the soil through compactive efforts. Maximum dry density, along with optimum moisture content, is determined in the laboratory and provides the target for field compaction.

Which equipment is used in Proctor test?

Standard Proctor Test Apparatus: Cylindrical Metal Mold, having internal diameter 4” (10.16 cm) or 6” (15.24 cm), the internal effective height of 4.6” (11.7 cm); and the mold should have detachable base plate & collar of 2 inches (5.08 cm).

What does 95 Mod Aashto mean?

Compaction requirements should be specified in terms of the required percentage of the Mod AASHTO maximum dry density (typically 93% or 95% Mod AASHTO MDD) and the moisture content at which compaction should take place (typically within 2% of the optimum moisture content).

Who invented the standard Proctor test?

Ralph Proctor
A range of standard compaction tests are available for determining the moisture–density relationship of a soil. The choice of test depends on the type of soil and the envisaged end use. One of the earliest tests was developed by Ralph Proctor in California in 1933 (O’Flaherty, 2002).

What is the objective of compaction test?

What is the purpose of the compaction test? The test aims to establish the maximum dry density that may be attained for a given soil with a standard amount of compaction effort. When a series of soil samples are compacted at different water content, the plot usually shows a peak.

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