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<p>This study investigates the temperature-dependent bonding behavior and mechanism of the cement grout–asphalt interface using two cement-based grouts, JGM301 and JGMHF5, and two asphalt types, SK-70# base asphalt and high-viscosity modified asphalt (HVMA). Pull-off tests conducted from − 10 to 60&#xa0;°C show a pronounced reduction in interfacial bonding strength with increasing temperature, accompanied by a progressive shift in governing failure from interfacial adhesive debonding to cohesive failure within the asphalt film. JGM301 consistently outperforms JGMHF5. At 25–35&#xa0;°C, the JGM301–asphalt interfacial strength reaches 1.03–1.98&#xa0;N/mm², which is 10%–36% higher than JGMHF5. At 60&#xa0;°C, JGM301 maintains 0.32–0.38&#xa0;N/mm², remaining 80%–291% higher. Quantitative failure-surface analysis identifies the failure-mode transition temperature, defined when adhesive and cohesive contributions become comparable, as 30–35&#xa0;°C for SK-70# base asphalt and 25–30&#xa0;°C for HVMA. Semi-flexible pavement and energy-dispersive spectroscopy (EDS) reveal an interpenetrating and interlocking interface transition zone for JGM301 and a comparatively planar interface for JGMHF5, consistent with the greater asphalt-related residue retained on the grout side after debonding. Contact-angle measurements further indicate improved wettability for JGM301, with angles of 82.21° and 85.16°, compared with 93.37° and 95.36° for JGMHF5. Fourier transform infrared spectroscopy (FTIR) shows no additional characteristic peaks for interfacial products, suggesting that enhanced bonding is dominated by wetting-enabled physical coupling, including microscale interpenetration and mechanical interlocking, rather than distinct chemical reactions. These findings provide mechanistic guidance for grout selection and interface design under variable service temperatures.</p>

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Micro-emulsification-Driven Physical Coupling at Cement Grout–Asphalt Interfaces and its Role in Failure-Mode Transition

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Yang Wang,
  • Guoguo Liu,
  • Chunyong Jiang,
  • Jian Gong,
  • Zhiqiang Wang

摘要

This study investigates the temperature-dependent bonding behavior and mechanism of the cement grout–asphalt interface using two cement-based grouts, JGM301 and JGMHF5, and two asphalt types, SK-70# base asphalt and high-viscosity modified asphalt (HVMA). Pull-off tests conducted from − 10 to 60 °C show a pronounced reduction in interfacial bonding strength with increasing temperature, accompanied by a progressive shift in governing failure from interfacial adhesive debonding to cohesive failure within the asphalt film. JGM301 consistently outperforms JGMHF5. At 25–35 °C, the JGM301–asphalt interfacial strength reaches 1.03–1.98 N/mm², which is 10%–36% higher than JGMHF5. At 60 °C, JGM301 maintains 0.32–0.38 N/mm², remaining 80%–291% higher. Quantitative failure-surface analysis identifies the failure-mode transition temperature, defined when adhesive and cohesive contributions become comparable, as 30–35 °C for SK-70# base asphalt and 25–30 °C for HVMA. Semi-flexible pavement and energy-dispersive spectroscopy (EDS) reveal an interpenetrating and interlocking interface transition zone for JGM301 and a comparatively planar interface for JGMHF5, consistent with the greater asphalt-related residue retained on the grout side after debonding. Contact-angle measurements further indicate improved wettability for JGM301, with angles of 82.21° and 85.16°, compared with 93.37° and 95.36° for JGMHF5. Fourier transform infrared spectroscopy (FTIR) shows no additional characteristic peaks for interfacial products, suggesting that enhanced bonding is dominated by wetting-enabled physical coupling, including microscale interpenetration and mechanical interlocking, rather than distinct chemical reactions. These findings provide mechanistic guidance for grout selection and interface design under variable service temperatures.