الفهرس 
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Abstract
Cal No.:Date: / / 200
Dissertation Title A COMPARATIVE STUDY OF DIFFERENT METHODS OF SOIL STABILIZTION FOR HIGHWAY PURPOSES:
CASE STUDY IN KUWATI SOIL
Dissertation Abstract (One page A4)
This study presents the results of a comprehensive comparative laboratory study for optimization and quantification of the beneficial effects of stabilization of subgrade soils in pavement systems. For this issue, two types of Kuwaiti soils; inorganic silt and clayey sand were selected for use in this study. On the other hand, six groups of stabilizers were used in order to compare amongst them to find out a procedure for quantification of stabilization benefits. Cement, lime, mixture of cement and polystyrene fibers, mixture of lime and polystyrene fibers, mixture of lime and fly ash and finally a mixture of lime, cement and fly ash are the six investigated groups of stabilizers. Unconfined compressive strength tests were performed for all combinations of variable ratios of stabilizers with the two investigated soils. Stress-strain characteristics were evaluated to find out the unconfined compressive strength. Subsequently, the initial tangent was plotted in order to fine out the modulus of elasticity (E-values). For most of the investigated stabilizers, it was found that the unconfined compressive strength increase with the increase of the stabilizer content. On the other hand, E-values have increased till certain ratio and rustically decreased.
A procedure was adopted to quantify the beneficial effect of subgrade soils stabilization benefits which based on the extension of pavement service life of reduction in the base course thickness. Based upon the adopted procedure, cement with content of 7% by dry weight of the soil mass proved to be the best stabilizing group however, the mixture of 7% lime and 15% fly ash yielded the worst stabilizing group amongst the selected groups of stabilizers.