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| Bulking of Sand |
The presence
of moisture in sand increases the volume of sand. This is due to fact that
moisture causes film of water around the sand particles which result in the
increase of volume of sand. For a moisture content of 5 to 8 percent, the
increase in volume may be about 5 to 8 percent, depending upon the grading of
sand. The finer the material, the more will be the increase in volume for a
given moisture content. This phenomenon is known as bulking of sand.
When
moisture content is increased by adding more water, sand particles pack near
each other and the amount of bulking of sand is decreased. Thus the dry sand
and the sand completely flooded with water have practically the same volume.
For finding
the bulking of sand, a test is carried out with following procedure.
·
A container is taken and it is filled two
third with the sample of sand to be tested.
·
The height is measured, say 20cm.
·
Sand is taken out of container.
·
The container is filled with water.
·
Sand is then slowly dropped in the container
and it is thoroughly stirred by means of a rod.
·
The height of sand is measured say 16cm, then
bulking of sand =
20-16 4
=
---------------- = -------- or 25%
16 16
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