Engineering properties of coated fiber-reinforced silty sand using direct shear testing

So far, many studies have been done on the stabilize the weak soil using conventional chemical stabilizers such as lime, cement and different modern materials such asnanoparticles, however, very limited studies were conducted on the effect of coated fibers on the shear strength of stabilized soils. This paper presents the results of a series of direct shear tests on treated soil specimens with ceramic fiber, nano-silica and kaolin. The effects of ceramic fiber addition, fiber length, nano-silica and kaolin contents on the mechanical behaviour and shear strength parameters of silty sand have been investigated. The results show that the addition of ceramic fibers to the silty sand leads to a significant increase in shear strength. The dilative behaviour of soil specimen has been found to decrease with addition of ceramic fibers. The cohesions of fiber-reinforced specimens increase due to coating fiber surface with nano-silica or kaolin particles. The internal friction angle of coated fiber-reinforced specimens decreases due to adding nano-silica particles. However, the internal friction angle of coated fiber-reinforced specimens is almost independent of kaolin content.

کلیدواژه ها:

Silty sand ، Ceramic fiber ، Nano-Silica ، Direct Shear Test ، California Bearing Ratio