Experimental and computational investigation of gas diffusion in bitumen

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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.
Original languageEnglish
Title of host publicationCompendium of Papers of the Annual Meeting of the Transportation Research Board 2017
Subtitle of host publication2017-1-8 to 2017-1-12, Washington DC, United States
Number of pages13
Publication statusPublished - Jan 2017
Event96th Annual Meeting of the Transportation Research Board: Transportation Innovation: Leading the Way in an Era of Rapid Change - Walter E. Washington Convention Center, Washington, United States
Duration: 8 Jan 201712 Jan 2017
Conference number: 96
http://www.trb.org/AnnualMeeting/AnnualMeeting.aspx

Conference

Conference96th Annual Meeting of the Transportation Research Board
Abbreviated titleTRB 96th anual meeting
CountryUnited States
CityWashington
Period8/01/1712/01/17
OtherThe meeting program will cover all transportation modes, with more than 5,000 presentations in over 800 sessions and workshops, addressing topics of interest to policy makers, administrators, practitioners, researchers, and representatives of government, industry, and academic institutions
Internet address

Keywords

  • Gas diffusion
  • Laplace transform
  • theorem of Residues
  • finite element method
  • porous asphalt

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