Microstructural Engineering of High-Content Rubber Asphalt via Precision Devulcanization for Enhanced Performance

Meng Yang¹Shanyuan Li¹Xiaohong Guo¹Mingyan Pu¹Chongyuan Li¹Ouyang Xu¹Shibing Wu¹Chaozhe Jiang^2*Yukun Li²Hanqing Mao³Lei Zhong²Wenqian A²

• ¹General Section of Haixi Highway Qinghai Province, Qinghai, China
• ²Southwest Jiaotong University, Chengdu, China
• ³Qinghai Provincial Department of Transportation, Xining, China

The practical deployment of high-content rubberized asphalt is often hindered by its compromised workability and unstable performance. Moving beyond conventional devulcanization approaches, this study introduces an integrated strategy of interface-controlled devulcanization and microstructural tailoring to address these challenges. A bespoke devulcanizing agent (RubberSynth-AP) was synthesized to promote selective scission of sulfur-based crosslinks and improve interfacial adhesion. Coupled with an optimized production process, this method allows the stable integration of crumb rubber at concentrations up to 30% by binder weight. Through multi-scale rheological analyses— encompassing temperature sweeps, multiple stress creep recovery (MSCR), and linear amplitude sweep (LAS) tests—an optimum rubber content of 26% was identified, exhibiting a superior combination of properties: a failure temperature of 76.5 ℃, 40% lower viscosity, 53.12% recovery rate, and enhanced fatigue resistance. Mechanistic analysis uncovered a microstructural evolution from a heterogeneous, stress-concentrating system to a homogeneous, elastic-network-dominated morphology. This structural improvement also supports the adoption of a dense-graded AC-13 mixture design, overcoming the traditional reliance on gap-graded skeletons, and achieving a remarkable dynamic stability of 3850 cycles/mm. Economically and environmentally, this technique promotes the consumption of 18 tons of waste rubber per lane-kilometer with a cost reduction of approximately ¥17,000. Collectively, this study demonstrates that the interface-controlled devulcanization strategy enables the production of high-content rubberized asphalt (up to 30%) with superior and balanced rheological properties, overcoming the longstanding workability-performance trade-off. The findings provide a scientifically-grounded and economically viable solution for developing sustainable pavement materials.