Abstract
In this study effectiveness of lime stabilization and geocell reinforcement techniques of roads was investigated for low bearing capacity subgrades. For this purpose, a large-scale plate load test was designed and used. Clayey soil with high moisture content was reinforced with different percentages of hydrated lime (5%, 10%, 15% dry weight of the soil). The deflection and stress results indicated that lime stabilization or geocell reinforcement alone did not significantly increase subgrade reaction coefficient and bearing capacity values. Promising results were obtained on stabilization of weak subgrade when both techniques were used together. It was determined that cellular reinforcement increased the reaction modulus coefficient value and bearing capacity of the subgrade soil by more than 15% compared to the lime stabilization.
Highlights
Lime stabilization has gained more acceptance compared to any other techniques applied to pavement layers especially on weak subgrade soils to increase the bearing capacity
In case a comparison among lime stabilization and geocell reinforcement based on vertical stresses is made, the results have indicated that the vertical stresses on the base reinforced with geocell were only 10% less than the base stabilized with 15% lime
As a result of the plate loading experiments, it was observed that lime stabilization and cellular confinement system increase the reaction modulus
Summary
Lime stabilization has gained more acceptance compared to any other techniques applied to pavement layers especially on weak subgrade soils to increase the bearing capacity. Lime added to the soil allows for an increase in deformation resistance of the soil by increasing shear strength and resilient module of the soil. Kavak (1996) reviewed unconfined compression resistances of pure bentonite and kaolin clays by stabilizing them with lime. As a result of their experiments, unconfined compression resistance of the clay showed 6 times increase in 1 month. They stated that resistance increases had continued in the long-term.
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