Study of the Molecular Components and Rheological Properties of Asphalt after Long-Term Aging under the Action of Moisture

Luo, Xiaobin; Xie, Kaizhong; Zhao, Shengbing; Qi, Yue; Qin, Yue

doi:10.3390/su14159080

Cited by 5 publications

(2 citation statements)

References 44 publications

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“…In addition, with increasing erosion, sodium and chloride ions accelerate the dissolution of some polar chemical groups (such as carboxylic acids) and water-soluble components in asphalt . The integrity of the asphalt film on the aggregate surface gradually diminishes, resulting in reduced colloidal stability of asphalt components, making the asphalt film more prone to cracking. , Sodium and chloride ions are more likely to diffuse into the asphalt film through diffusion and adsorption, entering the asphalt–aggregate interface . This further weakens the adhesion behavior at the asphalt–aggregate interface (see Figure where seawater and asphalt component overlap).…”

Section: Resultsmentioning

confidence: 99%

“…Studies indicate that the coupling effect of seawater salt solutions with high temperature, ultraviolet radiation, and other environmental factors accelerates the property deterioration and component degradation of asphalt material . Xiao et al also suggests a positive correlation between the solubility of chloride salts and the degree of asphalt aging, indirectly leading to the strength deterioration of the asphalt–aggregate interface.…”

Section: Introductionmentioning

confidence: 99%

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Molecular-Atomic Scale Insight on Asphalt–Aggregate Interface Interaction and Seawater Erosion with Different Aging-Resistant Materials Using Molecular Dynamics Simulations

Hu,

Zhou,

Sun

et al. 2024

Energy Fuels

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The durability of asphalt pavement in coastal regions has been a widely discussed topic due to the coupling effect of complex climate environment and seawater erosion. Aging-resistant materials (ARMs) significantly enhance the environment resistance of high-viscosity modified asphalt (HiMA), but their impact on the asphalt–aggregate interface interaction and seawater erosion-induced failure remains unclear. In this study, molecular dynamics simulation was employed to investigate the molecular-atomic scale interactions at the HiMA–aggregate interface and the evolution mechanism of seawater erosion with different ARMs. An analysis of the interface adhesion mechanism in different aging-resistant HiMAs was conducted based on molecular polarity, component distribution, and nanostructure evolution. The seawater erosion mechanism at the interface and the impact of ARMs were further investigated. The research indicates that ARMs interact extensively with asphalt components and polymers, altering the molecular spatial arrangement and nanostructure characteristics of HiMA at the aggregate interface. ARMs promote the free volume and diffusion ability of asphalt molecules and accelerate their aggregation at the aggregate interface. With the addition of ARMs, highly polar asphaltene and resin molecules intensify their movement toward the aggregate interface, exhibiting directional adsorption with aggregates. Simultaneously, weakly polar polymer and light components detach from the aggregate interface, vacating the active adsorption sites of aggregates. Consequently, ARMs enhance the interaction at the HiMA–aggregate interface. Seawater erosion induces water movement pathways at the aggregate interface, leading to the intrusion of ionic solutions into asphalt molecules and the occupation of aggregate active sites, thereby diminishing the direct interaction between polar asphalt components and aggregate. The addition of ARMs reduces the deterioration of asphalt nanostructure at the interface and the ion dissolution of asphalt polar components under seawater erosion, thus improving the interaction at the HiMA–aggregate interface. Light shielding material exhibits the most effective enhancement of the asphalt–aggregate interface stability under seawater erosion.

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