The Effects of Freezing and Thawing Cycles on Mechanical Properties of Fine-grained Soils Stabilized with Lime and Reinforced with Polypropylene Fiber

Document Type : Research Article


1 M.Sc Student of Soil Mechanics, Islamic Azad University, Central Tehran Branch

2 Assistant professor, Agricultural Engineering Research Institute


Due to the positive effects of adding lime in fine-grained soils and reinforcing these soils with polypropylene fiber, durability evaluation of stabilized or reinforced soils especially in cold regions where are more exposed to periodical freezing and thawing cycles is still necessary. In this research, 12 different treatments were prepared by using three levels of lime (0, 2 and 4 percent by weight of dry soil) and four levels of polypropylene fiber (0, 0.25, 0.5 and 1 percent by weight of dry soil). Each treatments with three replications has been cured for 28 days and undergoes numerous cycles of freezing and thawing including 0, 1, 4, 7 and 10 cycles, then unconfined compressive strength of the specimens were determined. According to results of various tests, it was found that using 4% lime with 0.5% polypropylene fibre is the most appropriate combination for making strongest and most durable mixture, as unconfined shear strength of test samples do not change after taking numerous cycles of freezing and thawing.


Qi, J.L., Zhang, J.M., Zhu, Y.L. , “Influence of freezing-thawing on soil structure and its soils mechanics significance”, Chinese Journal of Rock Mechanics and Engineering (Supp. 2), 2690-2694, 2004.
Qi, J., Ma, W., Song, C., “Influence of freeze-thaw on engineering properties of a silty soil”, Cold Regions Science And Technology 53, 397-404 , 2008.
Rajasekaran, G., Narasimha Rao, S., “Compressibility behavior of lime-treated marine clay”, Ocean Engineering 29, 545-55, 2002.
Tang, C., Shi, B., Gao, W. Chen., “Strength and mechanical behavior of short polypropylene fiber reinforced and cement stabilized clayey soil”, Geotextiles and Geomembranes 24, 1-9, 2006.
Wang, D., Ma, W., Niu, Y., Chang, X., Wen, Z., “Effect of cyclic freezing and thawing on mechanical properties of Qinghai-Tibet clay”, Cold Regions Science And Technology 48, 34-43, 2007.