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<p>High-RAP hot in-place recycled (HIPR) asphalt mixtures are prone to cracking and often show limited fracture resistance after damage. This study proposes a microwave-activated damage recovery strategy without dedicated external microwave absorbers, using basalt aggregates as inherent thermal activators and basalt fibers as crack-stabilizing reinforcements. SMA-13 HIPR mixtures with 70% reclaimed asphalt pavement were prepared. Microwave heating tests were conducted on basalt aggregates, diabase aggregates, RAP materials, and HIPR mixtures with and without 0.25% basalt fibers. X-ray fluorescence analysis was used to interpret aggregate heating behavior. Repeated semi-circular bending damage–microwave healing–reloading tests were performed to evaluate fracture energy recovery and secondary healing stability. Basalt aggregates showed stronger microwave heating ability than diabase aggregates and RAP materials. The B1 basalt aggregate reached 227.3&#xa0;°C after 150s, with an average heating rate of 1.53&#xa0;°C/s. Conventional HIPR and basalt fiber-reinforced HIPR showed the same average mixture-scale heating rate of 0.63&#xa0;°C/s, indicating that thermal activation was mainly governed by the basalt aggregate skeleton. At 105&#xa0;°C, the first healing index of basalt fiber-reinforced HIPR reached 51.46%, while its secondary healing retention reached 88.79%. Basalt aggregates provided microwave-induced thermal activation, whereas basalt fibers stabilized crack interfaces and improved fracture energy recovery. This coupled mechanism provides a material basis for microwave-assisted damage recovery without dedicated external microwave absorbers.</p>

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Microwave-activated damage recovery of basalt fiber-reinforced hot in-place recycled asphalt mixtures using basalt aggregates as inherent thermal activators

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Bo Li,
  • Zhen Chen,
  • Haopeng Wang,
  • Aihong Kang,
  • Zhengguang Wu

摘要

High-RAP hot in-place recycled (HIPR) asphalt mixtures are prone to cracking and often show limited fracture resistance after damage. This study proposes a microwave-activated damage recovery strategy without dedicated external microwave absorbers, using basalt aggregates as inherent thermal activators and basalt fibers as crack-stabilizing reinforcements. SMA-13 HIPR mixtures with 70% reclaimed asphalt pavement were prepared. Microwave heating tests were conducted on basalt aggregates, diabase aggregates, RAP materials, and HIPR mixtures with and without 0.25% basalt fibers. X-ray fluorescence analysis was used to interpret aggregate heating behavior. Repeated semi-circular bending damage–microwave healing–reloading tests were performed to evaluate fracture energy recovery and secondary healing stability. Basalt aggregates showed stronger microwave heating ability than diabase aggregates and RAP materials. The B1 basalt aggregate reached 227.3 °C after 150s, with an average heating rate of 1.53 °C/s. Conventional HIPR and basalt fiber-reinforced HIPR showed the same average mixture-scale heating rate of 0.63 °C/s, indicating that thermal activation was mainly governed by the basalt aggregate skeleton. At 105 °C, the first healing index of basalt fiber-reinforced HIPR reached 51.46%, while its secondary healing retention reached 88.79%. Basalt aggregates provided microwave-induced thermal activation, whereas basalt fibers stabilized crack interfaces and improved fracture energy recovery. This coupled mechanism provides a material basis for microwave-assisted damage recovery without dedicated external microwave absorbers.