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Oven Drying Method of Soil

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Oven Drying Method is used for determining the amount of water present in a specific soil.

 

 

Apparatus Required

i) Thermostatically controlled oven maintained at a temperature of 110 ± 5oC

ii) Weighing balance, with an accuracy of 0.04% of the weight of the soil taken

iii) Air-tight container made of non-corrodible material with lid

iv) Tongs

 

Quantity of Soil Required for Water Content Determination

 

Size of particles more than 90% of passingMinimum Quantity ( grams)
425-micron sieve25
2 mm sieve50
4.25 mm sieve200
10 mm sieve300
20 mm sieve500
40 mm sieve1000

 

 

Procedures in Oven Drying Method of Soil

i) Clean the container, dry it and weigh it with the lid (Weight ‘W1‘).

ii) Take the required quantity of the wet soil specimen in the container and weigh it with the lid (Weight ‘W2‘).

iii) Place the container, with its lid removed, in the oven till its weight becomes constant (Normally for 24hrs.).

iv) When the soil has dried, remove the container from the oven, using tongs.

v) Find the weight ‘W3‘ of the container with the lid and the dry soil sample.

Let us consider,

Weight of container with wet soil = W 1

Weight of container with dry soil  = W 2

Weight of Empty container = Wc

Weight of soil only = W1 – Wc

Weight of  dry soil only = W2 – Wc

Weight of water = W1 -W2

From definition,

WATER CONTENT = (Ww / Ws)  100%

= [(W1 – W2) / (W2 – Wc)] * 100%

 

Observations and Calculations of Oven Dry Method

Sl. No.Observations and CalculationsDetermination No.
123
Observation
1Container No.
2Mass of empty container (M1)
3Mass of container + soil (M2)
4Mass of container + dry soil (M3)
Calculations
5Mass of water Mw= M2 – M3
6Mass of solids, Ms= M3 – M1
7Water content= (5)/(6)x100

 

 

Result of Oven Dry Method

Water content of the given soil sample = ______%

 

 

Civil Nepal International

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