Published: 2022-09-22

The effect of the mixing method of the addition of Gilsonite natural bitumen on asphalt mixture properties

Marcin Bilski , Marta Mielczarek , Przemysław Górnaś , Mieczysław Słowik , Patrycja Wojciechowska

Abstract

The paper presents the results of laboratory tests performed on asphalt concrete mixtures modified with addition of Gilsonite natural bitumen (4% content in the weight of binder). Gilsonite was introduced into asphalt concrete using two methods: wet mixing and dry mixing. The laboratory tests encompassed determination of stiffness modulus in indirect tensile test, stiffness modulus in static creep test and resistance to water and frost. Based on statistical analysis of the obtained results, significance of differences was evaluated for the parameters of asphalt concrete modified with addition of Gilsonite (both wet-mixed and dry-mixed) and an unmodified reference mixture. It was determined that the method ("wet" or "dry") of mixing Gilsonite into the analyzed asphalt concrete mixture does not have a significant effect on the values of stiffness modulus in IT-CY test, static creep test stiffness modulus or the indirect tensile strength ratio ITSR.

Keywords:

asphalt mixture, creep test, Gilsonite natural bitumen, water and frost resistance.

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Bilski, M., Mielczarek, M., Górnaś, P., Słowik, M., & Wojciechowska, P. (2022). The effect of the mixing method of the addition of Gilsonite natural bitumen on asphalt mixture properties. Roads and Bridges - Drogi I Mosty, 21(3), 239–251. https://doi.org/10.7409/rabdim.022.014

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