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Impact of Combined Stabilization on Strength and Hydraulic Properties of Subgrade Soil

Saad Issa Sarsam


Gypseous subgrade soil provide suitable bearing strength when dry, however, it exhibits weak and collapsible behaviour when flooded with water. The strength and waterproofing properties can be enhanced by combined stabilization. An attempt has been made in the present investigation to implement hydrated lime and cutback asphalt as a combined stabilizing agents to reserve the strength and hydraulic properties of the subgrade soil. California bearing ratio test and unconfined compression test have been conducted for determination of the strength. However, constant head permeability and absorption test were conducted to evaluate the hydraulic properties. It was observed that the coefficient of permeability declines by (78.7 and 87.4) % and the water absorption decreased by (25 and 90) % after implementation of asphalt and combined stabilization processes respectively as compared to control gypseous soil. The unconfined compressive strength increases by 283 % as compared with asphalt stabilized soil. The combined and asphalt stabilized mixtures exhibits the highest load bearing capacity at 12 mm deformation when tested at unsoaked condition, while the load bearing capacity declines after soaking by (30.7 and 61.5) % for combined and asphalt stabilized mixtures respectively. Combined stabilization of gypseous soil with lime and cutback asphalt is recommended to enhance the strength and hydraulic properties of the subgrade.

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Moayyeri, N., Oulapour, M., & Haghighi, A. (2019). Study of geotechnical properties of a gypsiferous soil treated with lime and silica fume. Geomechanics and Engineering, 17(2), 195-206.

Idrus, M. M., Singh, J. S. M., Musbah, A. L. A., & Wijeyesekera, D. C. (2016, July). Investigation of Stabilised Batu Pahat Soft Soil Pertaining on its CBR and Permeability Properties for Road Construction. In IOP Conference Series: Materials Science and Engineering (Vol. 136, No. 1, p. 012026). IOP Publishing.

Dayalan, J., & Dayalan, J. (2016). Comparative study on stabilization of soil with ground granulated blast furnace slag (GGBS) and fly ash. Int. Res. J. Eng. Technol, 3(5), 5.

Sarsam S. (2021). Influence of Lime Stabilization on Compressive, Shear, and Consolidation Properties of Subgrade Soil. Global Journal of Scientific and Research Publications (GJSRP),1(1):6-12.

ukićević, M., Marjanović, M., Pujević, V., & Jocković, S. (2019). The alternatives to traditional materials for subsoil stabilization and embankments. Materials, 12(18), 3018..

Kalidas, N. S. (2014). Strength Characterstics of Stabilized Embankment Using Fly Ash. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE), 11(4), 01-34.

Linsha, R. D., Dharanya, Y. P., Vinodhini, V., & Pavithra, C. (2016). Improvement of shear strength of soil using bitumen emulsion. International Journal of Civil Engineering and Technology, 7(6), 156-165.

Verma, S. K. (2015). A laboratory study on use of bitumen emulsion in black soil. International Research Journal of Engineering and Technology (IRJET), 2(06).

Sarsam, S. I., Al Saidi, A. A., & Al Taie, A. (2017). Influence of combined stabilization on the structural properties of subgrade soil. J. Geotech. Eng, 4(1), 13-24.

Sant'Ana, W. C. (2009). Contribuição ao estudo de solo-emulsão em pavimentos de rodovias de baixo volume de tráfego para o Estado do Maranhão (Doctoral dissertation, Universidade de São Paulo).


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