ABSTRACT

The objectives of this study are to investigate and compare strength and stress-strain characteristics of a cohesive soil in natural and lime-treated states. For this purpose, a cohesive soil, which is located in a semi-arid region in Jordan, is selected and subjected to various laboratory tests. The experimental program involves three levels of treatment (3, 6 and 9 percent) with hydrated lime and a range of curing times (0, 7, 14, 21 and 28 days). The experimental results indicated that increasing the percent lime increased grain size, calcium ions, and the pH value while decreased the plasticity index, sodium ions, and dispersion. The compaction characteristics of the soil studied were not significantly affected by lime. Furthermore, the unconfined compressive strength and the undrained angle of internal friction were increased by the addition of lime and curing time. The undrained cohesion decreased with lime treatment up to 3 percent and increased beyond this level ( > 3 percent). A parameter termed lime treatment strength ratio (LSR) is introduced which is defined as the ratio of the unconfined compressive strength of a treated specimen to an untreated one. Greater values of LSR indicates that lime is more effective in stabilizing the soil in as far as strength is concerned. For the soil studied, LSR was found to increase with both lime percentage and curing time. Additionally, the undrained modulus, E_u, was found to increase significantly for LSR between 1.0 and 2.0. For values of LSR > 2.0, the increment in E_u was much smaller.

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