The Stablization of Lateritic Soil with Lime as a Pavement Material for the case of Wolayita – Sodo
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Date
2017
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Lateritic soil covers Western and dominantly Southern part of Ethiopia specially in NekemeteWollega,
Dilla,
Hossana,
Chida
and
Wollayita
Sodo
area.
When lateritic soil consist of high plastic clay, the plasticity of the soil may cause cracks and
damage on pavement, road ways, building foundations or any other civil engineering
construction projects. The improvement in the strength and durability of lateritic soil in the
recent time become imperative, this has geared up researchers toward using stabilizing
materials.
In this study, the soil sample was collected from southern Ethiopia region called WollayitaSodo
around
Wadu
area
which
was
one
of
the
sample
area
for
previous
study
called
“Index
and
shear
strength
study of
Lateritic
soil
in
Wollayita
Sodo
area”
by
(Tibebu,2008)
Index
properties
and
Engineering
properties
of
the
soils
were
studied
and
soil
is
classified
as
A7-5
according to AASHTO classification, the PI is about 22% and soaked CBR value of
21.9%.These values does not meet the desired values for competent road base and sub base
material according to ERA pavement manual .Therefore, In this study an attempt was made to
improve the property of the soil by stabilization with increasing percentage of lime until
optimum percentage is found.
As shown from the study, the addition of lime decrease maximum dry density and increase the
optimum moisture content with the same compaction effort and decrease the plasticity by
decreasing the plastic index to 7%.The unconfined compressive strength of Tp1 and Tp2 has
improved from 341.05kpa at 0% to 352.3kpa at 4% and 391.823kpa at 0% to 369.08kpa at 4%
lime content respectively as well as the soaked CBR value has improved from 21.9% at 0% to
54.7% at 4% lime Content.
Therefore, samples do not qualify for base course but can be utilized as a sub base material with
4% lime stabilization.
Description
Keywords
Lateritic Soil, Lime, Stablization, Pavement Material, Wolayita – Sodo