THE EFFECTS OF STABILIZATION ON BLACK COTTON SOIL
THE EFFECTS OF STABILIZATION ON BLACK COTTON SOIL
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Date
1991-08
Authors
AGBOOLA , OYEGUNLE
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Abstract
The addition of traces of chemicals in the
stabilisation and modification of expansive soils have
been a common practice. Basically, lime (hydrated lime
and quick lime) have been found to be most effective in
reducing the swelling properties of potentially
expansive soils. In regions where lime is scarce,
cement has been found to be a suitable alternative.
In Nigeria, the current prices of cement and lime
have been found to be very high, hence the need to look
for suitable alternative stabilizers to replace or
minimise the use of lime and cement.
This thesis considers the effects of local
hydrated lime, sand and calcium carbonate on the black
cotton soil as compared with those of limbux and cement.
From the results of this thesis, it has been found that
calcium carbonate greatly improve the workability of
the Black Cotton Soils because it reduces the cohesive
properties of the soil. For calcium carbonate
addition, up to 10% the cohesion of the Black cotton
soil can be reduced from 70kN/m3 to 22kN/m3.
Although sand can be used to reduce potential
expansion of Black Cotton clay, stringent maintenance
culture will be required and the cost advantage in using
sand depends on the distance through which the sand have vii
to be hauled. When sand is used as a stabilizing agent
in black cotton soil, 1 to 2% cement is recommended to
be added to the soil in order to improve the otherwise
low strength and durability properties of the sand
stabi1ised soi1.
The local lime showed the greatest advantage in
terms of cost. It cost about half the price the imported
lime and the improvements achieve through it use are
high for the calcium oxide content (44.9%) and the
percentage of insoluble residue (13.5fc) in it. In other
to improve the strength and durability of the lime
stabilized soil, it is recommended that a lime/cement
combination should be used.
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Keywords
STABILIZATION, COTTON SOIL