Determination of Moisture Content by Oven Drying Method
To determine moisture content of soil by oven drying method.
The water effect the density, shear strength, bulking and swelling of
soil. Its determination is important to incorporate its effect on the performance of any engineering structure.
AASHTO T 265
ASTM D 2216-71
Empty clean container, Moist Sample, Oven, Balance accurate to 0.01gm.
- Take an empty clean container and weigh the container as W3.
- Take the soil sample and place it in container and weigh the container with wet soil sample and record the mass as W1.
- Place the container with wet soil sample in the oven at constant temperature of 110±5°C for 24
- After 24 hours remove the container from oven and weigh the container with dry soil as W2
Observation and Data Collection
The observations to be taken during the test are shown on data Sheet.
|Mass of wet soil + container||W1|
|Mass of dry soil + container||W2|
|Mass of empty container||W3|
|Mass of water (W1 -W2)||Ww|
|Mass of soil (W2 -W3)||Ws|
|Moisture content = (Ww/Ws) x100 (%)||M.C|
Computation and interpretation
The computation to be done after the practical is as following: –
Obtain the mass of water (Ww) in soil and the mass of soil solids in soil (Ws) by using equations:
Ww = W1 – W2 Ws = W2 – W3
To provide a reasonably reliable water content determination, the following wet soil sample mass (Representative samples) are recommended.
Max size of soil particle Min mass of wet soil
No.40 sieve (425 mile micron) 10 – 50 gm
No.4 sieve (4.75 mm) 100 gm
12.5 mm (1/2 in) 300 gm
25 mm (1 in) 500 gm
50 mm (2 in) 1000 gm