Adhesion Mechanism and Modification Effect of Asphalt-Tuff Aggregate Interface
HU Yonglin
LÜ Zhong
JIN Huiyi
ZHANG Yuqing
WANG Juntao
Abstract：Based on a multi-scale framework encompassing the nanoscale-microscale-macroscale,the asphalt-tuff aggregate interface was investigated by molecular dynamics simulations.Six types of interface models were constructed while tensile simulations were conducted.The effects and mechanisms of anti-stripping agents and aggregate modifiers on interface adhesion property were explored.The results indicate that the distribution of asphalt components is regulated by anti-stripping agents through polar groups.The enrichment of asphaltenes at the interface is driven by the depolymerization of the polyoxyethylene ether chains in Xintuo anti-stripping agent(XT).Interfacial adhesion is synergistically enhanced by silane coupling agents(Si)together with Luyou anti-stripping agent(LY).The phenol hydroxyl-amino hydrogen bonds and aromatic ring-alkyl chain π-interlocking interactions improve the interfacial adhesion property by 87.36%.Performance trade-offs can be balanced by the proposed combined treatment strategy.For the model LY-Si,not only is interface adhesion property improved,but also a 300%increase in the diffusion coefficient is realized,and a simultaneous enhancement in interfacial toughness and relaxation capability is accomplished.The adhesion behavior of materials can be effectively predicted by the nanoscale model.
Keywords：pavement engineeringasphalt-aggregate interface modelanti-stripping agentaggregate modifieradhesion propertymolecular dynamics
Publication Date：2026-02-28
Online Publishing Date：2026-04-07(First online date of this platform, not the publication date of the document)
Pages：9( 233-241 )