Analysis of the influence of secondary polymers on the properties of polymer-modified bitumen
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DOI:
https://doi.org/10.32523/2616-6771-2025-150-1-66-81Keywords:
bitumen, secondary polypropylene, polymer additives, polymer-bitumen binders, modificationAbstract
This paper examines the modification of bitumen with secondary polypropylene in terms of chemical interactions, structural changes, and improved performance of the bitumen-polymer system. The processes of polymer dissolution and dispersion in the bitumen matrix are considered, as well as the effect of the molecular structure of polypropylene on the rheological, thermal, and mechanical properties of the resulting composite.
The key stages of preparing bitumen-polymer compositions are described, including thermal stabilization, homogenization, determining the optimal ratio of components, and methods for mixing them. An analysis of changes in the physico-chemical characteristics of the modified bitumen is carried out: softening temperature and needle penetration depth at 25°C.
The results of the study showed that the introduction of secondary polypropylene helps to increase heat resistance, increase viscosity, and improve the adhesive properties of the bitumen. This allows for its expanded use in asphalt concrete pavements, improving their durability and resistance to climatic factors. Additionally, various concentrations of the polymer additive (from 2% to 6%) and their effect on structural changes in the bitumen binder were studied. The data obtained indicate that the optimal concentration of polypropylene provides improved performance properties, reducing plastic deformation and increasing mechanical strength.
The use of secondary polypropylene allows not only to improve the quality of road surfaces, but also to solve the problem of recycling polymer waste, reducing the burden on the environment. This opens up prospects for further research in the field of polymer modification of bitumen and the development of more environmentally friendly and durable asphaltic concrete materials.
In relation to this, the mechanisms of interaction between polypropylene and the bitumen matrix are considered, including the effect of molecular weight, degree of crystallinity and thermal stability of the polymer. A comparative analysis of the properties of bitumen modified with various types of secondary polymers was carried out, which made it possible to identify the best option for use in road construction.
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Copyright (c) 2025 A. Syzdyk, G. Seitenova, E. Zhakmanova, L. Tolymbekova (Author)
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