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Please cite this article as: Changizi F, Haddad A, Strength properties of soft clay treated with mixture of nano-SiO 2 and recycled polyester fiber, Abstract: This paper investigates the effect of recycled polyester fiber, produced from polyethylene (PET) bottles, in combination with nano-SiO2 as a new stabilizer to improve the mechanical properties of soils. We intend to study the effect of adding nano-SiO2 and recycled polyester fiber on soil engineering properties, especially the shear strength and unconfined compressive strength (UCS), using clayey soil with low liquid limit. Three different combinations of fiber-soil ratios ranging between 0.1% and 0.5% as well as three different combinations of nano-soil ratios ranging between 0.5% and 1% are used. The shear strength and UCS of treated specimens are obtained from direct shear test and unconfined compression test, respectively. Results of this study show that the addition of recycled polyester fiber and nano-SiO2 increases the strength of soil specimens. Both the shear strength and UCS are improved by increasing the contents of recycled polyester fiber and nano-SiO2 in the soil mixture. The increase in the nano-SiO2 content leads to a reduction in failure strain, but the increase in the content of recycled polyester fiber leads to an increase in failure strain. The increase in the contents of recycled polyester fiber and nano-SiO2 leads to an increase in elastic modulus of soils. Based on the test results, the addition of recycled polyester fiber improves the mechanical properties of soils stabilized with nano-SiO2 as well as the recycled polyester fiber has a positive effect on soil behaviors.

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To date, the electrokinetic (EK) method has only been used to increase the bearing ca-pacity of steel piles. This study analysed the impact of EK on the bearing capacity of rein-forced cement concrete piles (RCCP), reinforced lime-cement concrete piles (RLCCP), and steel piles (SP) located in kaolin clay. The performance of four different cathodes was also evaluated, and the iron electrode was found to be the most effective cathode for using in EK process. Unlike RLCCP, the bearing capacity of 7-day cured RCCP with 5-day EK decreased due to corrosion in the pile body. However, the addition of lime to RCCP signif-icantly increased the pile bearing capacity by 57.8% with 8-day EK and prevented damage and corrosion in the pile body. It is concluded that EK can effectively increase the bearing capacity of both metallic and even concrete piles.