Damage on asphalt surfaces caused by ionic solution erosion and salt crystallization at molecular scale

Tang, Yujie; Fu, Zhen; Zhao, Peng; Ma, Feng; Hou, Yingjie

doi:10.1016/j.apsusc.2023.158718

Cited by 14 publications

(4 citation statements)

References 54 publications

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“…Consequently, the concentration of asphalt components on the aggregate surface significantly decreases, and the concentration distribution curves of asphalt components all shift toward the direction away from the aggregate. The increase in sodium and chloride ion concentrations indicates that seawater tends to interact with the aggregate interface . More sodium and chloride ions occupy the active sites on the aggregate interface, displacing the interaction positions of asphalt components with the aggregate active sites …”

Section: Resultsmentioning

confidence: 99%

“…Due to the erosive effects of chloride and sodium ions in seawater, an ion concentration gradient is established between the interface and interior of asphalt, inducing structural evolution and compositional changes at the asphalt interface. , This leads to the redistribution of asphalt components at the aggregate interface (Figures and ). 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 .…”

Section: Resultsmentioning

confidence: 99%

“…The increase in sodium and chloride ion concentrations indicates that seawater tends to interact with the aggregate interface. 64 More sodium and chloride ions occupy the active sites on the aggregate interface, displacing the interaction positions of asphalt components with the aggregate active sites. 27 Figure 22 confirms that sodium and chloride ions accumulate more rapidly compared to water molecules on the aggregate interface.…”

Section: Interface Failure Mechanismmentioning

confidence: 99%

“…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. 64 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. 65,66 Sodium and chloride ions are more likely to diffuse into the asphalt film through diffusion and adsorption, entering the asphalt−aggregate interface.…”

Section: Interface Failure Mechanismmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Resultsmentioning

confidence: 99%