Use Of Additives To Improve The
Engineering Properties Of Swelling Soils In
Thrace, Northern Greece
Author(s)
A. Athanasopoulou & G. Kollaros
Abstract
Highway construction engineers often face the need for more stable, durable and,
at the same time, more economic road structures. This is nowadays true because
of increased traffic volumes and heavier loads on the roadways. As a
consequence, enhanced pavement structures and improved subgrades is a
necessity. The international highway \“New Egnatia” crosses areas in Thrace,
Northern Greece with abundant clayey soils having poor technical properties.
The treatment of physical soils with some substances could bring up new
materials, which would operate better under the traffic and environmental
conditions. This has led to the decision to investigate the possibilities of
improving the existing soil materials using chemical additives. Soil samples were
collected from the abovementioned area and mixed with lime and fly ash, in
various proportions. The modification of the soil properties with special
emphasis on their strength has been examined in the laboratory after different
curing periods.
The experimental results have shown that the unconfined compressive
strength increased as a function of both the percentage of additive in the mixture
and the time of curing. The improvement depended upon the soil mineralogy and
the kind and quantity of exchangeable cations. This holds true when the
influence of the kind and quantity of the additive is taken into account. The
effects of lime on the swelling clayey soils tested were more beneficial than
those of fly ash.
The soils after their treatment could be used as a subgrade or even as a
subbase layer in roadway pavements.
Keywords: stabilization, lime, fly ash, engineering properties, unconfined
compressive strength, optimum moisture.
Keywords
stabilization, lime, fly ash, engineering properties, unconfined
compressive strength, optimum moisture
Related Book
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