About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Alexander A. Khomyakov, head of the construction laboratory LLC “UPTK”, Director, LLC “Sovtehpro”, Kazan, Russian Federation Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , ORCID 0000-0002-1237-7791 Alexey Y. Fomin, candidate of technical sciences, Kazan State University of Architecture and Engineering, Kazan, Russian Federation Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , ORCID 0000-0002-4795-1212 Evgeniy S. Studentsov, head of the laboratory of JSC «Alekseevskdorstroy», Republic of Tatarstan, Alekseevskoye, Russian Federation Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , ORCID 0009-0009-8893-6826 |
| Title of the article | Structure and properties of bitumen polysulfide binders of new composition |
| Abstract. | Problem statement. Organic polysulfides are promising as modifiers of petroleum road bitumen. Their introduction into bitumen allows obtaining binders with high elasticity and softening temperature, low brittleness temperature and wide temperature range of application. At the same time, polysulfides have a relatively small molecular weight (300-600 Mr) and to show a significant modification effect a relatively large dose of them in the binder composition is required (up to 40 wt.%), which increases the economic costs of producing polysulfides and bitumen-polysulfide binders based on them. In addition, the process of copolymerization of sulfur with organic products is quite long (3-4 hours), which increases the time of the production cycle and requires high energy costs. In order to optimize the composition, reduce the synthesis time and ensure the effect of bitumen modification with small doses of polysulfides (up to 5 wt.%), polysulfides of new compositions have been developed, consisting of sulfur, a mixture of higher fatty acids and polyethylene polyamine, with the introduction of a catalyst - calcium chloride - into the reaction mass. The objectives of the work are: the selection of components of the organic polysulfide composition; synthesis of organic polysulfide; introduction of polysulfide into petroleum road bitumen with the production of bitumen-polysulfide binders and study of their properties and structure. Results. The introduction of organic polysulfide of a new composition into bitumen helps to increase the binder softening temperature, reduce the brittleness and penetration temperature, and increase the adhesive properties to the materials of the mineral filler of the asphalt concrete mixture. The use of a catalyst allows reducing the time of polysulfide synthesis by 2 times. Bitumen-polysulfide binders are heterogeneous multiphase systems. Their microstructure contains crystalline neoplasms of a dendritic form. Conclusions. During the exposure period of hardened binders up to 7 days, a kinetic increase in the softening temperature and a decrease in penetration are observed, which is probably associated with the process of crystallization and recrystallization of organic polysulfide. The results obtained suggest that road asphalt concretes based on bitumen-polysulfide binders will have resistance to plastic and low-temperature deformations. |
| Keywords. | sulfur, bitumen, adhesion, modification, organic polysulfide, bitumen-polysulfide binders, asphalt concrete |
| For citations: | Khomyakov A.A., Fomin A.Y., Studentsov E.S. Structure and properties of bitumen polysulfide binders of new composition // News of KSUAE, 2025, № 1(71), p. 112-121, DOI: 10.48612/NewsKSUAE/71.10, EDN: LPZQEN |
