4 Liquid Limit by Casagrande Method (1)
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Transcript of 4 Liquid Limit by Casagrande Method (1)
CECE 2230 Geotechnical Engineering – 1 Practical Handout
Course Title: Geotechnical Engineering - 1Course Code: CECE 2230
Level: Advance DiplomaCourse Lecturer : Mr. Sivaram
Laboratory Technician: Mr Boggarapu Srinivas
Experiment - 4Determination of Liquid Limit of Soil by
Casagrande Apparatus
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Student Name
Student ID No.
Section No.
Group No.
Date of Performance
Shinas College of Technology
Department of Engineering
Civil Engineering Section
CECE 2230 Geotechnical Engineering – 1 Practical Handout
DETERMINATION OF LIQUID LIMIT OF SOIL
Experiment No: Date:
Objective :
To determine the Liquid limit of the given soil sample, by using Casagrande type
Liquid limit apparatus Method.
Theoretical Background :
Liquid limit is the water content corresponding to the arbitrary limit between liquid
and plastic state of Consistency of a soil. It is defined as the maximum water content
at which a part of the soil cut by groove of standard dimension will flow together from
a distance of 2 mm under an impact of 25 blows in the device.
Apparatus (or) Equipments Required:
Casagrande liquid limit device consisting of a brass cup
Grooving tool
Evaporating dish
Balance for weighing
Spatula
Wash bottle
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CECE 2230 Geotechnical Engineering – 1 Practical Handout .
Procedure :
1. Take 1000 g of soil sample which passes through 425 micron sieve and desired Quantity of water.
2. Mix the soil with water thoroughly and place the mixed paste in Casagrande liquid limit device almost half filled and level it with the help of spatula.
3. A grooving tool is used to cut the middle of soil in the cup
4. Turn the handle of the apparatus at the rate of 2 revolution per second, Continue until the two parts of the soil come in contact with the bottom of the groove along a distance of 10mm.
5. Record the number of blows required to cause the groove to close for approximately a length of 10mm.
6. Continue the above process in varying water content added.
7. The result of the test is plotted in graph corresponding to water content and Number of blows. From the graph the water content corresponding to 25 blows will give the liquid limit of the sample.
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CECE 2230 Geotechnical Engineering – 1 Practical Handout
Tabulations:
WORKSHEET FOR LIQUID LIMIT
Worksheet No. 1: Determination of Liquid Limit
Soil Description Sample No
Date Depth
LIQUID LIMIT 1 2 3 4 5
Number of blows
Container no.
Mass of container, g
Mass of wet soil + container,
g
Mass of dry soil + container,
g
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CECE 2230 Geotechnical Engineering – 1 Practical HandoutMass of moisture, g
Mass of dry soil, g
Moisture Content (%)
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CECE 2230 Geotechnical Engineering – 1 Practical Handout
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CECE 2230 Geotechnical Engineering – 1 Practical HandoutCalculations:
From graph,
Water content corresponding to 25 blows = ______ %
RESULT:
The Liquid limit of the given soil sample ( WL) = ______ %
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