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<p>Considering the detrimental effects of water-salt environments on the performance of waste glass asphalt mixtures, a silane coupling agent (SCA) was used to modify the surface of waste glass aggregate (WGA). Based on this modification, the dynamic changes in freeze–thaw damage, structural characteristics, and WGA’s resistance to water and salt erosion were quantified through semi-circular bending tests. Simultaneously, molecular dynamics simulations were conducted to analyze both unmodified and SCA-modified interfaces under varying salt concentrations. Interaction energy, particle trajectories, and radial distribution functions were examined to evaluate the microscopic behavior of asphalt and its interface with WGA, and to explore the mechanism of SCA modification. The results show that a high WGA content increases porosity, enabling water and salt to infiltrate the mixture and intensifying spalling between WGA and asphalt. SCA modification forms an ordered molecular layer on the WGA surface, significantly enhancing the adhesion between aggregate and asphalt. Limiting the WGA content to below 10% can reduce low-temperature damage in SCA-modified mixtures by up to 20%. Even under water and salt erosion, the organophilic ends on the modified aggregate surface continue to cross-link with asphalt molecules, maintaining strong interfacial adhesion.</p>

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Study on Water and Salt Resistance of Waste Glass Asphalt Mixture Modified by Silane Coupling Agent

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Yiming Li,
  • Qichao Gao,
  • Peifeng Cheng,
  • Rui Ma

摘要

Considering the detrimental effects of water-salt environments on the performance of waste glass asphalt mixtures, a silane coupling agent (SCA) was used to modify the surface of waste glass aggregate (WGA). Based on this modification, the dynamic changes in freeze–thaw damage, structural characteristics, and WGA’s resistance to water and salt erosion were quantified through semi-circular bending tests. Simultaneously, molecular dynamics simulations were conducted to analyze both unmodified and SCA-modified interfaces under varying salt concentrations. Interaction energy, particle trajectories, and radial distribution functions were examined to evaluate the microscopic behavior of asphalt and its interface with WGA, and to explore the mechanism of SCA modification. The results show that a high WGA content increases porosity, enabling water and salt to infiltrate the mixture and intensifying spalling between WGA and asphalt. SCA modification forms an ordered molecular layer on the WGA surface, significantly enhancing the adhesion between aggregate and asphalt. Limiting the WGA content to below 10% can reduce low-temperature damage in SCA-modified mixtures by up to 20%. Even under water and salt erosion, the organophilic ends on the modified aggregate surface continue to cross-link with asphalt molecules, maintaining strong interfacial adhesion.