INFLUENCE OF POLYETHYLENE ADDITIVES ON THE STRUCTURE AND PROPERTIES SBS-MODIFIED BITUMENS

UDC 665.775.4

  • Stepanovich Yuriy Alekseevich − PhD student. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: yurystepanovich@belstu.by

  • Shrubok Aleksandra Olegovna − PhD (Engineering), Asistant Professor, the Department of Oil and Gas Processing and Petroleum Chemistry. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: shrubok@belstu.by

DOI: https://doi.org/10.52065/2520-2669-2022-259-2-49-55

Key words: petroleum bitumen, polymer-bitumen binder, petroleum polymer resins, penetration, softening temperature, thermoplastic elastomer, strength characteristics.

For citation:Stepanovich Yu. A., Shrubok A. O. Influence of polyethylene additives on the structure and properties SBS-modified bitumens. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2022, no. 2 (259), pp. 49–55 (In Russian). DOI: https://doi.org/10.52065/2520-2669-2022-259-2-49-55.

Abstract

In this paper, polymer mixtures containing SBS-thermoplastic elastomer and low density polyethylene are offered as modifiers for petroleum bitumens. The purpose of the work was to determination the optimal ratio of the components of the combined modifier to obtain stable polymerbitumen binders with improved performance. Polymer-bitumen binders with the content of SBSthermoplastic elastomer 0–6% wt. and low density polyethylene 0–6% wt. were studed. Softening temperature, penetration, brittle point temperature, plasticity interval were determined. For polymerbitumen binders an increase in the concentration of polyethylene in the polymer mixture, an increase in the brittle temperature and a decrease in the plasticity interval and a needle penetration depth. The concentration of polyethylene in a mixture with copolymers of styrene and butadiene should not exceed 50%. To obtain high-quality binders the use of a combined modifier leads to a decrease in penetration by 25% and an increase in the plasticity range by 15% compared to unmodified bitumen. Dispersion and uniformity of distribution of the combined modifier in the volume of bitumen was studied by luminescent microscopy. It has been shown that when using a mixture of polymers with a ratio of SBS : LDPE equal to 2 : 1 and 5 : 1 as modifiers polymer-modified bitumen is characterized by satisfactory dispersion and distribution of the polymer in the volume of bitumen.

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08.04.2022