Lime-stabilisation of high plasticity swelling clay from Ethiopia
(2017) European Journal of Environmental and Civil Engineering — p. 1-11 (2017)
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- Abstract
- In the present study, highly expansive clay soils from the Highlands of Ethiopia were studied to evaluate the e ciency of lime treatment to improve their mechanical properties for road subgrades. Soils treated with quick lime at 5, 7 and 9% by dry weight of the soil were cured for seven days under controlled temperature of 40 ± 2 °C and geomechanical laboratory tests were conducted to evaluate its impact on the engineering properties of the soil. Test results show substantial improvements in the properties of the soil after lime treatment. Addition of lime signi cantly reduces the plasticity index and swelling potential of the soil. Similarly, despite the reduction of optimum proctor dry density due to lime treatment, the uncon ned compressive strength and the California bearing ratio show considerable improvements. Based on the current study, expansive soils of the studied area can be e ectively stabilised for road subgrade works with the addition of 7% quick lime by dry weight of the soil. For very problematic soil, as the one investigated here, the drastic reduction of swelling potential is of particular interest for a possible application of road subgrade.
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Negawo, W. J., Di Emidio, G., Bezuijen, A., Verástegui Flores, R. D., & François, B. (2017). Lime-stabilisation of high plasticity swelling clay from Ethiopia. European Journal of Environmental and Civil Engineering, 1-11. https://doi.org/10.1080/19648189.2017.1304272 (Original work published 2017)