Abstract

The operating conditions of roads have deteriorated; the increase in the number of heavy vehicles and the increase in load per axle lead to an increase in plastic deformations on asphalt concrete pavements. This problem reduces the reliability of road layers and increases the costs of their operation and repair, especially during hot periods, when the appearance of rutting and wave-like deformations significantly reduces the strength of the layers. The aim of the study was to identify the causes of plastic deformations in asphalt concrete layers and to determine scientifically based methods aimed at increasing the resistance of road layers to displacement. The use of analytical, comparative and statistical analysis made it possible to achieve the objectives of the study, scientifically assess the resistance of asphalt concrete layers of road pavement to displacement and develop recommendations for practical application. The main results of the study showed that the resistance of asphalt concrete layers to displacement depends on a number of internal and external factors. Internal factors include the structure of the mineral skeleton, the shape and size of aggregates, the viscosity of the bituminous binder, and the degree of mixture density. Sharp and crushed mineral particles contribute to the formation of a mixture framework and reduce plastic deformations, while excessive use of bitumen or a grade that does not correspond to climatic conditions, on the contrary, contributes to the formation of rutting. The influence of temperature is also significant: in summer, the layers heat up, the viscosity of bitumen decreases, the relaxation time shortens, resulting in rutting and displacement. Water resistance of layers, adhesion properties and degree of compaction are decisive factors for determining resistance to plastic deformations. The practical significance of the study lies in the fact that its results allow road builders and engineers to optimise asphalt concrete mixtures, improve the quality of layer compaction and ensure long-term and reliable road operation taking into account temperature conditions

Keywords

rut; resistance to displacement; bituminous binder; mineral aggregates; temperature factors; mixture density; strength of road layers

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Suggested citation

Zhalaldinov, M., Turabyev, Ch., Abdimomunova, G., Kodirov, B., & Salimjonov, J. (2025). Development of plastic deformations and ensuring shear resistance in asphalt concrete road pavements. News of Osh Technological University, 25(2), 35-42. https://doi.org/10.63621/notu./2.2025.35