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modified proctor test procedure


Compaction of soil:

 Compaction of soil is actually the phenomenon of densification of soil by applying some external load.By this way the particles of soil are packed together due to which our soil properties are improved which are discussed below.

 Why we do compaction?

The main pupose of compaction is to increase the strength of soil which is done by increasing the density of soil. By this way the soil particles get packed more tightly due which the soil can take load more than the loose soil.
And Also compaction increases the shear strength of soil.

Modified proctor test



Test used for measuring of Compaction:
  1. Standard proctor test
  2. Modified proctor test
 [for reading standard proctor test click on link below] 


https://onlinecivilstudy.blogspot.com/2018/12/compaction-tests-compaction-is-process.html

 Modified Proctor test:

 Objective

To obtain the graphical relationship of the “dry density’ to “moisture content” in the form of “compaction curve’, for determining the values of Optimum Moisture Content (OMC)
and Maximum Dry Density (MDD)

Apparatus details:

Compaction tests


Procedure:

A Modified Proctor test is conducted by placing soil in a standard mold and compacted with a standard ram.
Modified Proctor Test Procedure:
  •  Soil that needs to be compacted is placed in a standard mold and compacted
  •  Compaction of soil is done by dropping a standard ram 25 times for each layer of soil from a standard distance. Typically, soil is placed in five layers and compacted.
  •  After compaction of all five layers, the weight of the soil is obtained. The soil contains solids and water. Solids are basically soil particles.
    • M=Ms+Mw
      M = total mass of soil including water
        Ms = mass of solid portion of soil
          Mw = mass of water

        • Find the moisture content of the soil.
          • Moisture content is defined as Mw/Ms.
          Small sample of soil is taken and placed in the oven and measured

        • Find the dry density of soil:
          • Dry density of soil is given by Ms/V.
          Ms is the dry weight of soil and “V” is the total volume.

        •  Repeat the test few times with different moisture content and plot a graph between dry density and moisture content

        Difference between modified and standard proctor test:

        The difference is expained in a better way by the following image

        Compaction of soil tests
        Read More topics:



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