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This investigation was conducted to assess the efficacy of the glass, hay and polypropylene fibers for enhancing the unconfined compressive and tensile strengths of clayey soil stabilized with lime. Lime was mixed with the clayey soil in different proportions. Based on the optimum value obtained for lime (according to the unconfined compressive strength values), the compressive and tensile strength characteristics, stressstrain and loaddeflection behaviors of lime stabilized samples mixed with different percents of glass, hay and polypropylene fibers were investigated. Fibers were added to the soil at range of (0.5-1.5 %). All stabilized samples were cured for 7 days at 25 0 C. Results indicate that the inclusion of fibers does not meaningfully improve the compressive strength, but significantly enhances the tensile strength, stressstrain and loaddeflection behaviors. Also, it was found that the stressstrain and load deflection curves can be utilized to evaluate the performance of a fiberreinforced stabilized soil for geotechnical and pavement applications.

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This study concerns with the effect of long-term soaking on the unconfined compressive strength, loss in weight and gypsum dissolution of gypseous soil stabilized with (4%) lime, take into account the following variables: initial water content, water temperature, soaking duration.The results reveals that, the unconfined compressive strength was dropped, and the reduction in values was different according to the initial water content and water temperature, so that the reduction of the unconfined compressive strength of samples soaked in water at low temperatures (5° and 25° C) was greater than those soaked in water temperatures  at (490 and 600 C). The results obtained shows that the increase in soaking period decreases the percentage amount of gypsum and loss in weight for all water temperatures and soaking durations.

This work aims to study the effect of erosion on the strength, loss in weight and gypsum dissolution of gypseous soil stabilized with (4%) lime, take into account the following variables: initial water content, water temperature, soaking duration or flow duration and water velocity. The results indicate that, the unconfined compressive strength decreased for samples soaked in water have low temperature (5 0 and 25 0 C), further decrease in strength with increasing soaking duration. The higher water temperatures (49 0 and 60 0 C) showed increasing in the unconfined compressive strength. High water velocity causes decreasing in unconfined compressive strength, more loss in weight and more loss in gypsum content, for all values of flow duration and water temperature.