Stabilization of expansive clayey soil modified by lime with an emulsified asphalt addition

الملخص EN

This study deals with the possibility of the stabilization of expansive clayey soil pre-treated by lime, with an emulsified asphalt addition.

Soil from the "2nd Kafaat" District in Mosul was chosen it is classified as medium to high expansiveness in naturally.

The pre-treated soil was performed with (0.5, 1.0, and 1.5%) lime addition by weight.

After short period, emulsified asphalt was added with different percentages namely (2, 4, 6 and 8) by weight, for optimum percentages of an emulsified asphalt to give the most useful stabilization aspects.

The test result of lime addition alone showed that there was a considerable reduction in soil plasticity, 1.5% of lime addition converted the clayey soil towards non-plastic types.

The emulsified asphalt addition to the mixture, caused slight increase in the plasticity but, their values in the whole, remained below the value of the natural soil.

The specific gravity decreased with the emulsified asphalt addition as well as, a general reduction, compatible with the increase in the optimum moisture contents.

The absorption values of the treated soil with the emulsified asphalt showed consequent reduction as compared with the original one.

A significant reduction in swelling pressure and swelling percent were obtained as well as an improvement in some values of the unconfined compressive strength were realized at low percentages of emulsified asphalt addition, compatible with reduction in values of the high percent additions.