The impact of ageing on the bitumen stiffness modulus using the cam model

Małgorzata Cholewińska, Marek Iwański, Grzegorz Mazurek

Abstract


This article presents the results of the viscoelastic properties of the polymer-modified bitumen produced in Warm Mix Asphalt technology. A Fischer-Tropsch synthetic wax and a liquid surface-active agent (fatty amine) were used as bitumen viscosity-reducing modifiers. All tested parameters were determined after short-term and long-term ageing. The complex modulus G* and phase angle δ were measured with a cone-plate rheometer. All dynamic tests were performed at 60 °C within the frequency range from 0.005 Hz to 10 Hz. On the basis of the rheological index R determined using the Christensen−Anderson−Marasteanu (CAM) model, it was found that the fatty amine additive slowed down the age-hardening process in the bitumen. In contrast, the synthetic wax increased the stiffness of the bitumen at all levels tested, regardless of the type of ageing simulation process.

Keywords:

Christensen−Anderson−Marasteanu (CAM) model; long-term ageing; short-term ageing; viscoelasticity; warm mix asphalt technology

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DOI: 10.3846/bjrbe.2018.386

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Applied Sciences  vol: 9  issue: 5  first page: 846  year: 2019  
doi: 10.3390/app9050846

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