This increases the swelling potential of the aggrecan, and upon removal of the compression the aggrecan will re-swell and restore the original equilibrium.
It is obvious that the two types of lime are effective in reducing swelling potential.
In this paper, a new swelling potential classification and graph, having four respective zones indicating the low, moderate, high, very high swelling potential, was also developed and proposed.
Geotechnical properties investigated include the consistency limits, compaction, California Bearing Ratio, swelling potential and water-permeability.
The buffer materials of lower PI value could decrease swelling potential and increase permeability.
Plasticity index values are varying from minimum 1 % to maximum of 29 %, indicating low to medium swelling potential.
The increased swelling potential is dissipated upon removal of the load as the original equilibrium is restored.
However, Atterberg's consistency limit tests indicate that the samples are moderate to high plastic soils with moderate swelling potential.
Based on the classification proposed by Bekkouche et al. (2000) which defined the swelling potential by the relation between clay content and PI (Figure 7), the INL samples are plotted in the moderate swelling potential area while INL and MCL samples plot toward very high swelling potential area.
The deformation due to the swelling potential also decreased to about 20%.
Several engineering methods were here used to obtained indices used in the estimation of swelling potential in a group of soil samples with a wide variation in swelling and to classify them into swelling potential classes.
