Properties of modified bitumen in road construction

The increase in the construction of asphalt concrete roads in Kazakhstan has led to the development of research on raw materials in this industry. Bitumen binder as the main component affecting the deformation properties, as well as the physical and mechanical properties of coatings, in general, is of the greatest interest to builders. The analysis of scientific sources in the field of the application of various modifiers of bitumen binders is carried out. Polymer-based additives have been widely used in road construction. The use of half-dimensional additives contributes to the improvement of asphalt concrete indicators: strength properties, water resistance, deformative stability of the coating at high and low operating temperatures, wear resistance, and resistance to rutting, which generally increases the repair time and contributes to a corresponding reduction in operating costs. This article presents a study of the properties of bitumen modified with an additive based on rubber crumbs. Indicators such as penetration depth and softening temperature by the ring and ball method are investigated in the article. The samples with different content of additives were taken: control sample without additives, and samples with the addition of modifiers in the amount of 5%, 10%, 12%, and 15% out of bitumen weight. The highest viscosity is shown by the sample with a modifier of 12%. Bitumen samples with a modifier content of 12% and 15% correspond to the standard indicators regarding softening temperature.