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Study on strengthening mechanism of fiber reinforced asphalt concrete based on micromechanical model

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Document pages: 12 pages

Abstract: Short fibers are widely used to prepare fiber reinforced asphalt concrete (frac). However, although frac has been successfully designed using experimental methods, the internal interaction between fiber and other phases of asphalt concrete is not clear. In this paper, the strengthening mechanism of fracturing is studied from the micro point of view by numerical method. Based on Monte Carlo theory, a two-dimensional micromechanical model of fracturing is established. The effects of fiber length and content on the stress state of asphalt mortar, effective modulus and viscoelastic deformation of asphalt concrete were studied. The numerical results are verified by indirect tensile stiffness modulus (ITSM) test and uniaxial creep test. The results show that the maximum stress of asphalt mortar is low to the control concrete when the fiber length is longer than 12 mm. Fiber reduces the stress level of asphalt mortar significantly. Fiber length has no significant influence on the effective modulus of asphalt concrete. Fiber length and content both have notable impacts on the viscoelastic performance of FRAC. Fiber length should be given more attention in the future design of FRAC except the content.

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