Influence of sea salt on the interfacial adhesion of bitumen–aggregate systems by molecular dynamics simulation

Nanomechanical-atomistic insights on interface interactions in asphalt mixtures with various chloride ion erosion statuses.

Mechanical behaviors of asphalt mixtures modified with European rock bitumen and waste cooking oil

Laboratory investigation on performance and mechanism of polyphosphoric acid modified bio-asphalt

Abstract As one of the most widely used nanomaterials in asphalt modification, the nano-silica (nano-SiO 2 ) can significantly improve the self-healing behavior of asphalt eco-friendly. However, understanding of the self-healing mechanism of nano-SiO 2 in asphalt is still limited. The objective of the study is to reveal the self-healing mechanism of nano-SiO 2 in asphalt by using molecular dynamics (MD) simulations from the nanoscale. A 10 Å (Å) vacuum pad was added between the two same stable asphalt models to represent the micro-cracks inside the asphalt. The self-healing process of virgin asphalt, oxidation aging asphalt, and nano-SiO 2 modified asphalt was studied using density evolution, relative concentration, diffusion coefficient, activation energy, and pre-exponential factor. The simulation results conclude that nano-SiO 2 improves the self-healing ability of asphalt by increasing the diffusion rate of molecules with aromatic structures without alkyl side chains and molecules with structures with longer alkyl chains. The self-healing capability of asphalt may be principally determined by the diffusion of light components such as saturate, while nano-SiO 2 only plays an inducing role. The research findings could provide insights to understand the self-healing mechanism of nano-SiO 2 in asphalt for promoting the sustainability of bitumen pavements while increasing their durability. Graphical abstract 

https://jipr.springeropen.com/track/pdf/10.1186/s43065-022-00049-2

Atomistic-scale investigation of self-healing mechanism in Nano-silica modified asphalt through molecular dynamics simulation

This study aims to extend the spectral element technique to the three-dimensional (3D) mechanical response of the multi-layered transversely isotropic structure under a moving vehicular load and im...

3D Spectral element model with a space-decoupling technique for the response of transversely isotropic pavements to moving vehicular loading

Analytical model for two-dimensional electro-osmosis-enhanced preloading consolidation of unsaturated soil

This paper has proposed a closed-form solution for two-dimensional (2D) plane strain consolidation in unsaturated soils with lateral and vertical semipermeable drainage boundaries under time-dependent loading. By using the eigenfunction expansion technique, the governing equations are expanded into coupled ordinary differential equations, and the final solution of pore pressures is obtained by the integral transform method. The degraded proposed solution is then verified with the existing solution. The results show full agreement with the solutions, which indicates the proposed solution and program are completely correct. Meanwhile, the comparison between the analytical solutions and the finite-element simulations also demonstrates the correctness of the proposed solution. Subsequently, the effect of semipermeable parameters and loading parameters on the consolidation behavior has been investigated through the obtained analytical solution. And the distribution of consolidation profiles along two different directions has also been studied. It can be concluded that time-dependent loading changes the dissipation process obviously compared with constant loading. 

An Analytical Solution for 2D Plane Strain Consolidation in Unsaturated Soils with Lateral and Vertical Semipermeable Drainage Boundaries under Time-Dependent Loading

This paper proposes an analytical solution for 2D (two‐dimensional) consolidation of unsaturated soil with impeded drainage boundaries by considering the combined effects of self‐weight stress of soil and time‐dependent loading. The governing equation of the 2D consolidation model was first formulated, followed by an analytical solution employing the methods of the Laplace transform technique and separation of variables. The solution is then degraded to validate the correctness against two classical lab tests and existing solutions. Subsequently, the proposed solution is further verified against finite element calculations. The results indicate that the self‐weight stress of soil acts as an additional load applied to the unsaturated soil, the larger the self‐weight stress, the greater the value of initial EPPs (excess pore pressures). Meanwhile, it can be easily found that the larger the value of self‐weight stress, the larger the consolidation settlement. Without accounting for the effect of self‐weight stress, the settlement of the soil will certainly be underestimated and the dissipation characteristics of EPPs will not be accurately captured. It can be also found that the ratio of ka/kw also significantly influenced the consolidation behavior.

An analytical model for 2D consolidation of unsaturated soil with semi‐permeable boundaries considering self‐weight stress and time‐dependent loading

A Unified Deterioration Model for Elastic Modulus of Rocks with Coupling Influence of Plastic Shear Strain and Confining Stress

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