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<p>Mathematical modeling of a flow of polymer–bitumen binder in a cylindrical pipe has been carried out. Oxidized BND 70/100 grade butadiene–styrene copolymer-modified bitumens have been selected for investigations. The results of investigations have shown that the rheological properties of the binding substances under consideration can be described with the Cross model. At low shear rates, the spatial structure formed as a result of modifying bitumen with a polymer remains unchanged, and the flow is characterized by high effective viscosity values. At high shear rates, the process of spatial structure breakdown becomes intense and is accompanied by viscosity decrease. With increase in temperature the binder passes from a gel state to a liquid state. With increase in the average flow rate the formation of a dynamic boundary layer and the flow stabilization occur at large distances from the inlet. The effective viscosity values in the near-axial zone increase downstream. With hydrodynamic stabilization in the near-axial region a high-viscosity flow zone is formed. In the pre-axial flow zone, the effective viscosity assumes maximum values, while near the wall, it takes minimum values.</p>

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Investigation into a Flow of a Polymer–Bitumen Binder, Described by the Cross Model, in a Cylindrical Pipe

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • O. V. Matvienko,
  • N. S. Firsanova,
  • O. A. Skvortsova,
  • I. S. Cherkasov

摘要

Mathematical modeling of a flow of polymer–bitumen binder in a cylindrical pipe has been carried out. Oxidized BND 70/100 grade butadiene–styrene copolymer-modified bitumens have been selected for investigations. The results of investigations have shown that the rheological properties of the binding substances under consideration can be described with the Cross model. At low shear rates, the spatial structure formed as a result of modifying bitumen with a polymer remains unchanged, and the flow is characterized by high effective viscosity values. At high shear rates, the process of spatial structure breakdown becomes intense and is accompanied by viscosity decrease. With increase in temperature the binder passes from a gel state to a liquid state. With increase in the average flow rate the formation of a dynamic boundary layer and the flow stabilization occur at large distances from the inlet. The effective viscosity values in the near-axial zone increase downstream. With hydrodynamic stabilization in the near-axial region a high-viscosity flow zone is formed. In the pre-axial flow zone, the effective viscosity assumes maximum values, while near the wall, it takes minimum values.