Mechanical and moisture performance of asphalt concrete containing polyurethane-coated basalt fiber and recycled polyethylene

The invention relates to the development and application of a polymer additive for asphalt concrete mixtures aimed at enhancing the mechanical and durability properties of road pavements. The study introduces a composite additive consisting of polyurethane-coated modified basalt fiber (38.0–42.0 wt.%) and recycled polyethylene (rPE) (58.0-62.0 wt.%). The additive can be incorporated into dense-graded or stone-mastic asphalt concrete at controlled dosages, ensuring uniform distribution throughout the mixture. Laboratory tests have demonstrated that asphalt concrete containing the polymer additive exhibits higher stability, improved tensile strength, and reduced water susceptibility compared to conventional mixtures. The additive also contributes to the environmental sustainability of road construction by enabling the partial use of recycled asphalt pavement (RAP) materials without compromising performance. The method of preparation involves precise heating, blending, and homogenization steps to maintain the optimal physical properties of the polymer, ensuring compatibility with the bitumen matrix. This innovation is particularly suitable for regions experiencing extreme temperature fluctuations and heavy traffic loads, providing longer pavement service life and reducing maintenance costs. The polymer additive can be adapted for various asphalt mix designs and construction technologies, offering flexibility for both new road construction and rehabilitation projects. Overall, the use of this polymer additive in asphalt concrete mixtures represents a significant advancement in pavement engineering, combining improved structural performance, economic efficiency, and environmental benefits. The additive is compatible with existing asphalt production facilities and can be easily integrated into standard asphalt mixing processes, promoting widespread adoption in modern road construction practices.

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