Earth
is another one binding material that is used in padobe bricks. For producing
padobe bricks, the earth should have clay content more than 30%. So various
samples of earth was collected in our college campus and shake test was
conducted. And finally the earth having clay content 44.44% was used. The following figure shows
the shake test.
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Shake test
The following
steps will explain how the shake test was conducted.
o
First the rock and small stones were removed
from the earth.
o
Then the organic matter that was present in the
earth was removed.
o
A vertical sided transparent vertical one-liter
plastic jar was taken.
o
Then the two third of jar was filled with water
and the remaining was filled with earth.
o
Then the jar was shaked vigorously for two
minutes and then allowed for rest.
o
First the sand and heavier particles settled
down immediately.
o
Above that, silt settled down in a few minutes
to several hours.
o
At last the clay settled on the top of the silt
within several hours to 24hours.
o
Then the total height of deposit was measured.
This was denoted as ‘h’.
o
After that, the height of the clay deposit was
measured. That was denoted as ‘hc’.
o
Then the
clay content was calculated by this formula
% of clay = (hc/h)
x 100
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