Print Email Facebook Twitter Experimental and computational investigation of gas diffusion in bitumen Title Experimental and computational investigation of gas diffusion in bitumen Author Jing, R. (TU Delft Pavement Engineering) van Lent, Diederik (TNO) Kasbergen, C. (TU Delft Pavement Engineering) Scarpas, Athanasios (TU Delft Pavement Engineering) Liu, X. (TU Delft Pavement Engineering) Erkens, S. (TU Delft Pavement Engineering) Date 2017 Abstract When oxygen diffuses in a bituminous film, it also reacts, simultaneously, with the constituents of the bitumen and as such it is gradually depleted. This depletion process masks the characteristics of the actual diffusion process and complicates the determination of the diffusion coefficient needed for computation of oxygen concentration and its effects on bitumen degradation due to aging. In the present study, experiments were carried out to measure objectively oxygen absorption in bitumen at various temperatures independently of oxygen depletion phenomena. To achieve this, an improved version of van Oort’s test set up was utilized and oxygen was replaced by nitrogen. A Laplace transform based numerical technique was developed for processing the test results to determine the diffusion coefficients under various conditions. Once validated, they were used in finite element simulations to demonstrate the influence of time and temperature on gas diffusion and concentration in porous asphalt mixtures. Subject Gas diffusionLaplace transformtheorem of Residuesfinite element methodporous asphalt To reference this document use: http://resolver.tudelft.nl/uuid:95a439c7-16a5-4308-9808-ced78d3febd3 Source Compendium of Papers of the Annual Meeting of the Transportation Research Board 2017: 2017-1-8 to 2017-1-12, Washington DC, United States Event 96th Annual Meeting of the Transportation Research Board, 2017-01-08 → 2017-01-12, Walter E. Washington Convention Center, Washington, United States Part of collection Institutional Repository Document type conference paper Rights © 2017 R. Jing, Diederik van Lent, C. Kasbergen, Athanasios Scarpas, X. Liu, S. Erkens Files PDF 2017_2_Ruxin_Jing_et_al_E ... submit.pdf 1.33 MB Close viewer /islandora/object/uuid:95a439c7-16a5-4308-9808-ced78d3febd3/datastream/OBJ/view