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Correlation Between Optimum Moisture Content (omc) and Plastic Limit (pl) of Fine Grained Soil

Md. Nahid Rahman
Department of Civil Engineering, Daffodil International University

Md. Murshedul Islam
Department of Civil Engineering, Daffodil International University

A. Ullah
Department of Civil Engineering, Daffodil International University

Abstract/ Executive Summary:

Abstract: Plastic limit (PL) and optimum moisture content (OMC) laboratory tests are essential for any earthwork construction since they play a significant role in any newly started construction site. But it takes an excessive amount of time to determine OMC. Many of the index properties were found to be related to compaction parameters, optimum moisture content, and maximum dry density. The plasticity indices and the proportion of particles had the most significant connections, with the plastic limit having the highest degree of simple correlation. As a result, using the plastic limit of soil, it is necessary to determine these compaction properties. If compaction properties are correlated to plastic limit, it may be easier to determine OMC. Finally, a simple equation has been generated to obtain the optimum moisture content (OMC) and the plastic limit (PL) of all the fine-grained soil. A useful equation and many graphical approaches have been used for quickly predicting compaction characteristics from index properties. The accuracy of these equations and graphical approaches has been assessed in this paper and determined to be adequate with most prediction results. This proposed correlation is going to be an easier method for engineers in quickly assessing their suitability for compaction related purposes.

Keywords: Compaction, Optimum moisture content (OMC), Plastic limit (PL), Earthwork, Fine-grained soil

Location: From nine different districts in Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil Moisture

Objectives:

In this work, a relationship is defined and an equation is developed between these two qualities, OMC and PL, which is highly valuable for a wide range of construction projects.

Methodology:

Samples are collected from nine different districts in Bangladesh. Most of the soil was found in medium and low plasticity soil and some of the soil is found in low plasticity silt. Dhaka soil was collected from the old airport of the Dhaka cantonment. Low plasticity clay (CL) soil was collected from this location. Savar is in the Dhaka district. Savar soil was collected from the main town of Savar, which lies near the new market area of Savar. Low plasticity clay (CL) soil was collected from this location. Sylhet soil was collected from the city of Sylhet. This location produced low plasticity silt (ML) soil. Rangpur soil was gathered from the city of Rangpur. This area produced low plasticity silt (ML). Rangpur Division's Kurigram district is located. Kurigram soil was taken from Jorgas, a village in Chilmari upazila. Low plasticity silt was found in the soil (ML). The district of Gaibandha is part of the Rangpur division. Gaibandha soil was collected in the Gaibandha district's Saghatta Upazila. Low plasticity silt (ML) was found in this location. Bogura is a district in the Rajshahi Division. The soil was collected in Bogura district's Sonatola Upazila. This location produced low plasticity silt (ML) soil. Bhola is a district of the Barisal Division. Soil from Bhola city was collected, and it was found low plasticity silt (ML) soil. Cox's Bazar is located in the Chattogram division. Soil from Cox's Bazar was collected and identified as low plasticity silt (ML) soil. To begin, all of the soil was placed in the oven to dry. After that, #4 ASTM standard sieve was used for the OMC test and #40 ASTM standard sieve was used for the plastic limit test. All the soil was characterized for physical properties namely, grain size analysis test, atterberg limit test, maximum dry density and optimum moisture content. Grain size analysis is performed to determine the soil sample which is finegrained or coarse-grained which are examined by sieve analysis. In this laboratory experiment there are some ASTM standard sieve which are #4, #16, #30, #40, #50, #100, #200 and a pan. This test is required ASTM standard. For optimum moisture content, standard proctor compaction machinery was employed, optimum moisture content (OMC) and maximum dry density (MDD) of soil can be determined by standard proctor compaction test. The compactive effort is the amount of mechanical energy that is applied to the soil mass. Soil samples must be taken extra weight than the test apparatus. ASTM D 698 - Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbs/ft³ (600 kN-m/m3 ), and the most often used method for plastic limit testing was the hand-rolling method, in which wet clay was rolled into threads about 3.2mm in diameter. The results of the compaction are then analyzed using graphical analysis. The maximum dry density (MDD) curve peak point in the graph was used to calculate the optimum moisture content. These are all methods that have been used for determining the values of OMC and PL. Aside from these tests, the laboratory also performs liquid limit testing and grain size analysis tests. The ASTM standard Casagrande apparatus was used to test the liquid limit, and all ASTM standard sieves were used to test sieve analysis. All the tests are followed by American Society for Testing and Materials (ASTM) standards.

Source of Information: DAFFODIL INTERNATIONAL UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY, VOLUME 17, ISSUE 1, JANUARY 2022 ISSN 1818-5878 (Print) 2408-8498 (Online)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This research result has been made from the correlation of optimum moisture content (OMC) and plastic limit (PL) of the soil samples. The correlation between optimum moisture content and plastic limit of fine-grained soils is found to be practicable based on the experimental findings. This study's investigation provided the following correlation below:

y= 0.8556x - 0.2428

OMC can be easily found out by this equation with the help of the plastic limit of soil. So if only knowing the plastic limit result it can easily calculate the OMC value by using the plastic limit value in the equation. For more sophisticated analysis, it is not necessary to determine OMC again by the proctor compaction apparatus where the approximate results have been taken by the equation already. The proposed correlation equations between natural soil compaction properties and their plastic limit will be a useful tool for geotechnical engineers in swiftly analyzing natural soil suitability for compaction-related uses.

Knowledge Management: Journal