Shear strength of clayey sand treated by nanoclay mixed with recycled polyester fiber

Abstract

The main objective of this study is to investigate the effects of the nanoclay mixed with recycled polyester fiber on the mechanical behavior of soil as a new stabilizer material. To meet this objective, a series of drained direct shear and compaction tests were performed on unreinforced and reinforced soil specimens with three different combinations of the fiber-soil ratios ranging between 0.1% and 0.5%, as well as three different combinations of nanoclay-soil ratios ranging between 0.5% and 1.5% of the soil dry weight. Results indicated that composition of the nanoclay-recycled polyester fiber with the soil improved the friction angle (Φ) by 41% and cohesion (c) by 174%. The soil particles stick together through viscose gel produced by nanoclay. In addition, the rough and wavy surface of the fibers creates a bond and friction between the soil particles and prevents the movement of soil particles, and as a result, the soil strength is increased.

Keywords

soil treatment / nanoclay / recycled polyester fiber / shear strength / clayey sand

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