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http://dx.doi.org/10.12652/Ksce.2019.39.1.0219

An Alternative One-Step Computation Approach for Computing Thermal Stress of Asphalt Mixture: the Laplace Transformation  

Moon, Ki Hoon (Korea Expressway Corporation)
Kwon, Oh Sun (Korea Expressway Corporation)
Cho, Mun Jin (Dokyeong construction CO., LTD)
Cannone, Falchetto Augusto (ISBS Technical University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.39, no.1, 2019 , pp. 219-225 More about this Journal
Abstract
Computing low temperature performance of asphalt mixture is one of the important tasks especially for cold regions. It is well known that experimental creep testing work is needed for computation of thermal stress and critical cracking temperature of given asphalt mixture. Thermal stress is conventionally computed through two steps of computation. First, the relaxation modulus is generated thorough the inter-conversion of the experimental creep stiffness data through the application of Hopkins and Hamming's algorithm. Secondly, thermal stress is numerically estimated solving the convolution integral. In this paper, one-step thermal stress computation methodology based on the Laplace transformation is introduced. After the extensive experimental works and comparisons of two different computation approaches, it is found that Laplace transformation application provides reliable computation results compared to the conventional approach: using two step computation with Hopkins and Hamming's algorithm.
Keywords
Thermal stress; Creep test; Hopkins and hamming's algorithm; Laplace transformation;
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