Stabilization of Light Grey and Red Clay Subgrade Soil Using Sa-44/Ls-40 Chemical and Lime
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Date
2008-01
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Addis Ababa University
Abstract
This study is undertaken on a light grey (expansive) and a red
clay soil samples taken from within Addis Ababa. The change in
engineering properties of these soils treated with SA-
44/LS-40 chemical alone, lime alone and combinations of both
at different application rates are investigated.
The investigation of the modifications in engineering properties
of the stabilized soils are made using laboratory tests that
include soaked CBR and CBR swell tests, swelling pressure
test, Atterberg limit tests, percent swell test and free swell tests.
The modifications in engineering properties were evaluated
after curing the treated sample for fourteen days.
From the study, it is observed that the application of lime alone
and SA-44/LS-40 chemical with lime shows improvements of
varying degree on the engineering properties of both the light
grey and the red clay soils. However, no specific mix ratio
showed the maximum improvement in all the engineering
properties of each soil. This suggests that before deciding for
large-scale applications, the desired improvement level of the
engineering properties of a particular soil should be specified
first, and tests be conducted for different mix ratios to arrive at
the optimum one.
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Chemical