Transcript
S.VINODHKUMARAP/CIVIL ENGINEERING
KONGU ENGINEERING COLLEGE
Simple Test on Soil
Determination of Moisture Content
IS: 2720 (Part-II)–1973Oven Drying methodSand Bath methodAlcohol methodCalcium carbide methodPycnometer methodTorsion balance methodRadiation method
S.VINODHKUMAR /ASSISTNT PROFESSOR/KONGU ENGINEERING COLLEGE
Oven Drying methodIt is a standard laboratory method.
S.VINODHKUMAR /ASSISTNT PROFESSOR/KONGU ENGINEERING COLLEGE
Sand Bath methodThis is a field method of
determining rough value of the water content.
The container with the soil is placed on a sand bath. Heated over a kerosene stove.
The soil become dry within ½ to 1 hrs.
It should not be used for organic soil or soil containing higher percentage of gypsum.
S.VINODHKUMAR /ASSISTNT PROFESSOR/KONGU ENGINEERING COLLEGE
Alcohol metodMethylated Sprit is added to soil Throughly mixed Heated
S.VINODHKUMAR /ASSISTNT PROFESSOR/KONGU ENGINEERING COLLEGE
Calcium carbide method• ‘Rapid Moisture Tester’ • Reaction between a carbide
reagent and soil moisture. • The wet soil sample is placed
in a sealed container• with calcium carbide, and the
acetylene gas produced exerts pressure on a sensitive
• diaphragm placed at the end of the container.
• This pressure is correlated to the moisture
• content and is calibrated on a dial gauge on the other side of the diaphragm.S.VINODHKUMAR /ASSISTNT
PROFESSOR/KONGU ENGINEERING COLLEGE
Pycnometer method
S.VINODHKUMAR /ASSISTNT PROFESSOR/KONGU ENGINEERING COLLEGE
Torsion balance methodUse of Infra-Red Speedy
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Radiation method
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Specific Gravity Determination
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Specific Gravity DeterminationDensity Bottle methodPycnometer methodMeasuring Flask methodShrinkage limit method
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Procedure
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Measurement of densityWater displacement methodCore cutter methodSand replacement method
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Water displacement method
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Core-cutter Method
• 10 cm in diameter and 12.5 cm in length.
• The dolly is 2.5 cm long.• suitable for soft cohesive soils. • It cannot be used for stiff clays, sandy
soils and soils containing gravel particles, which could damage the cutting edge.
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Sand replacement method1. CALIBRATION OF SAND
DENSITY
2. MEASUREMENT OF SOIL DENSITY in-situ
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CALIBRATION OF SAND DENSITY Take sand passing through 600μ and retain on 300 μ in SPC
upto 1cm from top Let the mass is being M1 Place the SPC over a glass plate and open the slit. Once the
sand stops its movement, close the shutter and weigh the SPC ----- M2
Refill SPC to M1 Place the SPC over the Calibrating container, open slit, Once the
sand stops its movement, close the shutter and weigh the SPC----- M3
The weight of soil in Calibrating container is M1- M2-M3M1- M2-M3
Density of sand = M1-M2-M3Density of sand = M1-M2-M3------------------------------ VVS.VINODHKUMAR /ASSISTNT
PROFESSOR/KONGU ENGINEERING COLLEGE
MEASUREMENT OF SOIL DENSITY
in-situClean the area, place the tray over the area.
Dig out the soil through the hole for a depth of about 10 cm and collect the soil on the plate.
S.VINODHKUMAR /ASSISTNT PROFESSOR/KONGU ENGINEERING COLLEGE
MEASUREMENT OF SOIL DENSITY
in-situTake refilled SPC to the site and place it
over the hole.Open the shutter and close it when there is
no movement of soil inside the SPC.Calculate the volume of hole.Insitu density = Mass of soil excavated
from pit/ volume of pit
S.VINODHKUMAR /ASSISTNT PROFESSOR/KONGU ENGINEERING COLLEGE
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