Increasing the temperature of every viscous liquid decreases its viscosity because molecules have greater thermal energy and are more easily able to overcome the attractive forces binding them together.
Unfortunately, I don't know the effect of temperature on the oxidised bitumen. Of course, some molecules will break when the temperature increases and this also reduces the viscosity.
Claude-Alain Roulet
many thanks for the answer. Normally, the viscosity of bitumen generally increases after thermal stress. This is due to the natural aging processes. However, there is the phenomenon that the oxidized bitumen after intense heat of around 250 degrees Celsius is no longer harder after cooling down, as the current state of science has shown, but that it becomes softer after cooling down. I can't find any verifiable sources for it. The only assumption is that the bitumen structure is destroyed in this way on a molecular level. but I would also like to prove that with the help of comparable theses.
Marco Leim
Thank you for the information. The molecular composiution of bitumen before and after thermal stress could be analysed to explain this behaviour.
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