Investigation on Improving the Goetechnical Properties of Lateritic Soil by Blending with Chemical Stabilizer
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Date
2011-04
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Addis Ababa University
Abstract
In road construction, earth roads become muddy and slippery during wet season and
cause dust problem during dry season. At the time of road construction obtaining good
road construction material is becoming scarcer and as much as possible use in-situ
material. One of the in-situ materials is laterite soils.
The objective of this research work was to study the usefulness of Con-Aid as a
stabilizer for laterite soil. Sampled from Gidole town (South Ethiopia) has been
investigated.
Four specimens were taken from two test pits at different depths from Gidole town
(South Ethiopia).The geo-chemical characteristics have been investigated on soils
sampled. Accordingly, the soils under considerations were laterites. Moisture contents
determination using oven temperature of 105oC and oven temperature of 50oC with
maximum relative humidity (RH) 30% were also carried out on the soil samples to
investigate presence of loosely bound water of hydration. It was obtained that the soil
samples did not contain loosely bound molecular water in a significant amount.
Atterberg limits were investigated for testing procedure on the soil samples to see effect
of test manipulation on concretionary bond. The liquid limit tests were carried out on
soil specimens mixed for 5 minutes and 30 minutes durations. It was observed from the
test results that the mixing durations has significant effect on the values of liquid limits.
The Atterberg limits, compaction and soaked CBR tests carried out without and with
Con-Aid chemical, to evaluate the change in the engineering properties of the stabilized
soil after curing the treated samples for different periods. From the test results, were not
seen a promising reduction of plasticity, increment of maximum dry density and
improvement of the CBR value. These indicate that the Con-Aid effect does not exceed
the natural effect of the laterite soil. Full reactions of Con-Aid could not take places,
because the soil under investigation in Gidole town was naturally cementeous material
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Keywords
Goetechnical ;lateritic soil