Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Water diffusion in bitumen films
Highlights Water absorption data did not show the expected approach to a saturation, equilibrium value. After an initial period the rate of water absorption was approximately constant. The data was not consistent with previous modelling using Fick’s law. A new diffusion-“reaction” model for water absorption was developed that described the experimental data with high precision.
Abstract The diffusion of water into 1.0 mm films of bitumen for up to 14 months was measured gravimetrically at 25 °C. The data did not show any approach to equilibrium but rather showed a continual uptake of water that tended to an approximately constant (linear) rate at longer times. It was hypothesized that the water uptake behaviour observed was due to adsorption of water onto water-soluble salt crystals or similar sites dispersed in the bitumen, as has previously been reported in the literature. The process was modelled as a combination of molecular diffusion obeying Fick’s law and an irreversible adsorption “reaction”, the rate of which was proportional to the water concentration. An equation describing the process was found to fit the data with a high level of accuracy (R2 > 0.99) and values of the diffusion coefficient and rate constant were calculated.
Water diffusion in bitumen films
Highlights Water absorption data did not show the expected approach to a saturation, equilibrium value. After an initial period the rate of water absorption was approximately constant. The data was not consistent with previous modelling using Fick’s law. A new diffusion-“reaction” model for water absorption was developed that described the experimental data with high precision.
Abstract The diffusion of water into 1.0 mm films of bitumen for up to 14 months was measured gravimetrically at 25 °C. The data did not show any approach to equilibrium but rather showed a continual uptake of water that tended to an approximately constant (linear) rate at longer times. It was hypothesized that the water uptake behaviour observed was due to adsorption of water onto water-soluble salt crystals or similar sites dispersed in the bitumen, as has previously been reported in the literature. The process was modelled as a combination of molecular diffusion obeying Fick’s law and an irreversible adsorption “reaction”, the rate of which was proportional to the water concentration. An equation describing the process was found to fit the data with a high level of accuracy (R2 > 0.99) and values of the diffusion coefficient and rate constant were calculated.
Water diffusion in bitumen films
Herrington, Philip R. (Autor:in) / Wu, Jeremy P. (Autor:in) / van den Kerkhof, Lia C. (Autor:in) / Bagshaw, Stephen A. (Autor:in)
30.04.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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