The effect of water content on shear and compressive behavior of polymeric fiber-reinforced clay
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The effect of water content on shear and compressive behavior of polymeric fiber‑reinforced clay Mahyar Arabani1 · Hamed Haghsheno1 Received: 9 May 2020 / Accepted: 22 September 2020 © Springer Nature Switzerland AG 2020
Abstract Soil reinforcement is a reliable and effective technique for enhancing soil resistance. The present study aims to investigate the impact of water content on the mechanical behavior of a fiber-reinforced clay. To this end, clay specimens were prepared with three water contents (15%, 17.5%, and 20% by clay weight) and three contents of fiber (0.1%, 0.2%, and 0.3% referred to clay weight). Next direct shear and unconfined compressive strength tests were performed to study the effect of water content on the modulus of elasticity, compressive strength, strain energy, shear strength, shear strength ratio, stress–strain behavior, internal friction angle and cohesion coefficient of the prepared clay. The results indicate when the water content is lower than the optimum moisture content (OMC), fiber decreases modulus of elasticity and increases ductile behavior, compressive and shear strength, strain energy, shear strength ratio and cohesion coefficient but when the water content is more than the OMC, fiber increases brittle behavior, compressive and shear strength, strain energy, shear strength ratio and friction angle. Keywords Reinforced clay · Polymeric fibers · Water content · Compressive strength · Shear strength
1 Introduction Soil reinforcement has been long recognized and used as a suitable method for enhancing its stability and resistance [1]. Nowadays, soil reinforcement methods are considered among a specialized branch of geotechnical studies. This science deals with materials suitable to reinforce soil with scientific principles, the use of new technologies, and improving the engineering specifications and mechanical properties such as strength, brittleness, elasticity, deformation, and bearing capacity [2]. Reinforced soil is a combination of two different types of materials, including soil grains (to withstand compressive stresses) and reinforcing materials (to withstand tensile stresses). Materials commonly used in soil reinforcement are made of metals, polymeric materials, and even plants’ fibers. The mechanism of action and behavior of reinforced soil is based on
the interactions between soil and reinforcing element. In this regard, the friction phenomenon between soil and reinforcement element plays an essential role [1]. One of the soil reinforcement methods is to mix fibers with soil. The mixing of soil with fibers creates a composite environment in which the involvement of soil grains with elements of reinforcement improves ductility and strength in different ways. Although various types of fibers distribution can take place inside the soil, a random distribution of fibers inside the soil strengthens the soil in every way and removes the weak surface [3]. In the last few decades, especially since half a century ago, extensive research on the understanding and assessment o
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