Özet:

The performance of the superstructure in the transportation structures (railway, highway etc.) is directly affected by the characteristics of subgrade. However, it is not always possible to find the desired quality subgrade soil in the areas where both highway and railway routes. In such cases, it is an option to improve the problematic soils in place by using additives (lime, cement etc.). The aim of this study is to investigate the effect of lime on the unconfined compressive strength (UCS) of a low plasticity clayey soil under different curing time (0, 1, 7 and 28 days) and different curing conditions (in a desiccator and soaked). Firstly, geotechnical tests (classification and compaction) were conducted to determine properties of soil. UCS test samples at five different lime contents (2%, 3%, 4%, 5% and 6% by weight) were prepared and cured in desiccator. Then UCS test was conducted immediately at the end of the curing time. On the other hand, the optimum lime content by weight was determined as 4 % by using the pH method. After curing time in the desiccator, the samples prepared with optimum lime content were soaked in water for 4 days and then UCS test was carried out. As a result, with the addition of lime, maximum dry density values decreased, optimum water content values increased. UCS significantly increased with both lime content and curing time. For 28 days, soaked UCS of the samples prepared with 4% optimum lime content decreased by approximately 50% according to unsoaked condition

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