Astudy on The Effect of Remolding on The Mechanical Behavior of Addis Ababa Red Clay Soil
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Date
2010-04
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Addis Ababa University
Abstract
This research work tries to see the effect of soil remolding on the
mechanical behavior of red clay of Addis Ababa. It is tried to identify the
effect of remolding by conducting a series of laboratory tests such as
triaxial compression and consolidation tests on the undisturbed and
remolded soil samples. The soil was remolded by compacting at OMC. It
was also done basic tests to see the engineering properties of the soils.
The one dimensional consolidation tests were done on samples of
diameters of 50mm and 70mm and height of 18mm with the effective
consolidation stresses of 50 kpa to 1600 kpa. A total of eight onedimensional
consolidation tests were run, out of which four were
undisturbed and four were remolded samples. The deformation and hydromechanical
/permeability while loading/ behavior were examined using
the one dimensional consolidation test.
The triaxial tests were done on samples of 38mm and height of twice the
diameter. Two triaxial testing machines were employed on the testing
program. Soil samples collected from Kolfe areas were conducted on the
newly acquired Automatic triaxial testing machines and samples collected
from Addisu Gebeya area were tested on the semi automatic triaxial
compression machine procured two years ago. The type of triaxial test
employed was Consolidated undrained/CU/ with pore pressure
measurement and with the effective consolidation pressure of 150 kpa,
250 kpa and 350 kpa. A total of twenty-four triaxial CU tests were run out
of which twelve were undisturbed and twelve were remolded. The results of
triaxial tests were used to examine the stress-strain and strength
behavior. The results show that remolding reduces the peak deviator stress, effective
cohesion and permeability and increases amount of compression and time
required for consolidation
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Keywords
Clay ;soil