Skip to main content

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:



        Labels:

        Comments

        Post a Comment

        Popular posts from this blog

        Compaction test

        Compaction tests: Compaction is the process of  densification of soil particles by apply the external load                          Mainly two test are done in the laboratory for the compaction test. Standard proctor test  Modified proctor test Standard proctor test: As we know that the degree of compaction is measured in terms of dry density. And dry density depends upon moisture content. The dry density is maximum at the Optimum moisture content. So for this test a curve is drawn between dry density and water content. Because by drawing this curve we can obtain the maximum dry density and also the OMC. Apparatus Required for the test: Compaction mould Hammer 2.6kg Collor 60mm Oven Detachable base plate Dessicator Spatula I.S seive, 4.75mm Weighting balance Calculator Dimensions of Apparatus: The Proctor compaction mold and hammer is 101.6mm in diameter and 116.4...
        Post a Comment
        Read more

        Issb preparation

        Issb notes Future officer Every one of us want to become A military officer. And we know that ISSB is the platform for the selection of military officers We must pass this exam for selection. SO the below link contain All the test data which is helpful for the student appearing in the test. And also the most asked interview questions are present in these notes. SO share our website with your friends. for more help write your problems in comment section, click the below link For showing the notes you must sign in from your Google account  If you like this then please follow us for more interesting activities  https://drive.google.com/file/d/0BzlTnFJuK7-IWThuTXRHWlhVMm8/view?usp=drive_web
        2 comments
        Read more

        how does a drinking water treatment plant work?

        Water Treatment Plant: The process of making water suitable for use is called water treatment As all living things require water for their lives also the use of water in industries and in other practical works is significant. And we all know that at every palace in the world the pure water or clean water is not available so we use Some techniques to improve the water quality.  One of them is a water treatment plant. The concept of Water treatment plant is now a days widely used by many of countries. Although its initial cost is very high but its performance is very good. So now I am going to share with you that how this work.. Conventional water treatment plant: The flow chart of conventional water treatment plant is given below check out this Source Intake structure → Primary  sedimentation → coagulation and flocculation → Secondary sedimentation → Filtration → Disinfection   → Storage/Distribution. Source: Source is the place from where we get th...
        Post a Comment
        Read more