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- W4281639139 abstract "This paper studies the meso-structural characteristics of porous asphalt (PA) mixture and the influence of heterogeneity on the overall mechanical and thermal properties of pavement. A porous asphalt mixture model considering the temperature-stress dual-field coupling is developed. The effect of temperature stresses generated during the gradual decrease of the internal temperature of porous asphalt mixture from 25 °C to −25 °C on the micro-cracked inside the aggregate, is simulated using the finite element software. The magnitude of the temperature stress values generated inside the mixture when the internal voids of the porous asphalt mixture are filled with air and water, is analyzed. In order to analyze the tendency of expansion of micro-cracks within the aggregates in asphalt mixes under temperature stress, a macroscopic test of the maximum cooling range is carried out with Marshall specimens, and the simulation results of the finite element software are verified. The results show that when there are micro-cracked aggregates in porous asphalt mixtures, as the temperature of the asphalt mixture decreases, stress concentration occurs at the cracks of the aggregate, and the stress concentration at the end of the aggregate crack is the most obvious. The temperature stress value generated at the crack end of the damaged aggregate first reaches the aggregate crushing value. Under the same cooling amplitude, the stress value generated in the mixture when the voids of the porous asphalt mixture are filled with water is larger than that when the voids are filled with air. Finally, the obtained results have a certain reference value for the study of the damage law of porous asphalt mixture by temperature stress, when the ambient temperature decreases." @default.
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- W4281639139 date "2022-08-01" @default.
- W4281639139 modified "2023-10-16" @default.
- W4281639139 title "Meso-structural characteristics of porous asphalt mixture based on temperature-stress coupling and its influence on aggregate damage" @default.
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- W4281639139 doi "https://doi.org/10.1016/j.conbuildmat.2022.128064" @default.
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