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Keywords
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Clayey soil, plastic waste, triaxial test, shear strength, compressibility, swelling
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Abstract
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The main objective of this study is to analyze the
use of plastic waste materials for the reinforcement of
clayey soils. An experimental study was conducted to
investigate the compressibility and undrained shear
behavior of clayey soil mixed with plastic waste. Clayey
soil was mixed with various amounts of plastic waste (i.e.;
0, 0.5, 1.0, 1.5 and 3.0 % in dry weight) and soil compaction, consolidated undrained triaxial and oedometer
consolidation tests were performed on the mixtures to
study the effects of plastic waste, plastic flexibility, confining pressure and initial density on clayey soil behavior.
According to the results, plastic wastes do not affect the
compaction characteristics of clayey soil considerably. The
addition of plastic wastes that exceed a specific value (i.e.,
1.0 % in this research) changes the undrained behavior of
samples from contractive to dilative. The addition of
plastic wastes beyond 1.0 % improves shear strength and
reduces compressibility of the clay. Increasing rate in shear
strength and decreasing rate in compressibility depends on
the confining pressure, flexibility of plastic and the initial
density of the samples. The rate of increasing or decreasing
is more noticeable when plastic rigidity, initial density and
confining pressures are relatively high. Moreover, plastic
waste has negative effects on the free swelling, swelling
pressure and swelling index of samples; such parameters
are therefore higher in plastic waste mixed clay than the
associated values of plain clay.
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