Shear Strength Parameters of Soil Reinforced with Ceramic Fibers Coated with Nano-Silica and Kaolin

Document Type : Scientific - Research

Authors

1 PhD student, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Assistant professor, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

3 Professor, Department of Geology, University of Isfahan, Isfahan, Iran

4 Associate professor, Department of Textile Engineering, Isfahan University of Technology, Isfahan, Iran

Abstract

In this paper, the effect of various parameters on the shear strength parameters of soil reinforced with ceramic fibers coated with nano-silica and kaolin particles has been investigated using the results of direct shear tests. The effect of the ceramic fiber content, fiber length, the nano-silica and kaolin contents and the content of fibers coated with nano-silica and kaolin on the shear strength parameters of reinforced silty sand has been investigated. The microscopic structure of the samples and the interaction of nano-silica, kaolin and fibers have also been examined with Scanning Electron Microscope (SEM). The results show that the shear strength parameters of the samples increase by adding ceramic fiber, nano-silica or kaolin particles to the natural soil. The length of ceramic fibers does not have a significant effect on the shear strength parameters of fiber-reinforced specimens, and 0.5% fiber content was recognized as the optimal fiber content. The samples containing kaolin particles have a higher shear strength than those containing nano-silica particles for a constant content of additive. The coating of fibers with kaolin has a greater effect on increasing the shear strength parameters of the samples.

Keywords


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