Published: 2025-12-05

The effect of fiber-rubber additive compositions on the rheological properties of asphalt mastics

Krzysztof Maciejewski , Przemysław Zaprzalski , Anna Chomicz-Kowalska , Witalij Zankowicz

Abstract

The article presents the results of research on the effect of the composition of a fibre-rubber additive, which is currently produced on an industrial scale in Poland and is used as a stabilizer for gap-graded mineral-asphalt mixtures, such as SMA. The study included asphalt mastics composed of paving grade bitumen (unmodified) and limestone filler and additives: a rubber powder obtained by grinding at ambient temperature – partially devulcanized and activated – and synthetic fibers from the textile cords of the end-of-life tires. The tests included dynamic viscosity, rheological characterization for the evaluation of dynamic shear modulus with phase angle in oscillatory shear as well as multiple stress creep recovery tests for the evaluation of non-recoverable creep compliance and elastic recovery at incrementally increasing stress values. The results were related to the asphalt mastic without the additive, consisting only of unmodified bitumen and limestone filler. The results of the research allowed for the assessment of the effect of fibre-rubber additive components on the rheological characteristics of asphalt mastics, which allows for further development of technologies for improving the properties of asphalt mixtures in an environmentally sustainable manner and increasing the functionality of these additives.

Keywords:

asphalt mastic, crumb rubber, end-of-life tires, textile cord, tire recycling

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Maciejewski, K., Zaprzalski, P., Chomicz-Kowalska, A., & Zankowicz, W. (2025). The effect of fiber-rubber additive compositions on the rheological properties of asphalt mastics. Roads and Bridges – Drogi I Mosty, 24(4), 481–493. https://doi.org/10.7409/rabdim.025.031

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