Identification of Viscoelastic Functions for Hot-Mix Asphalt Mixtures Using a Modified Harmony Search Algorithm |
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| Authors: | Sungho Mun Sangyum Lee |
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| Affiliation: | 1Assistant Professor, School of Civil Engineering, Seoul National Univ. of Science and Technology, 138 Gongneung-gil, Nowon-gu, Seoul, 139-743, South Korea; formerly, Senior Researcher, Expressway and Transportation Research Institute, Korea Expressway Corporation, 50-5, Sancheok-ri, Dongtan-myeon, Hwaseong-si, Gyeonggi-do, 445-812, South Korea (corresponding author). E-mail: smundyna@gmail.com
2Director, Road Management Division, Seoul Metropolitan Government, Deoksugung-gil 15, Jung-gu, Seoul, 100-110, South Korea. E-mail: slee11@seoul.go.kr
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| Abstract: | This study proposes a modified harmony search (MHS) algorithm for determining the time-domain viscoelastic function of hot-mix asphalt (HMA) concrete materials. This MHS technique, employing a global optimization technique as well as a Wiechert model for the relaxation function, substantially enhances accuracy and consistency in the determination of viscoelastic functions of several HMA mixtures. In addition, this study shows how to determine a time-domain Prony series representation from the complex modulus in the frequency domain using the MHS algorithm. This can be efficiently used for numerical analysis with techniques such as the finite-element method. The results from lab frequency sweep tests of unmodified and lime-modified HMA at various asphalt contents were consistent with the functions obtained from the MHS algorithm. |
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| Keywords: | Viscoelasticity Asphalts Mixtures Algorithms |
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