Asphalt Interface Engineering and Advanced Functional Coatings for Sustainable Pavements

A Special Issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: 25 October 2026 | Viewed by 2035

Editors


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Guest Editor
School of Construction Engineering, Dalian University of Technology, Dalian 116024, China
Interests: magnesium-based cementitious materials; solid waste resource utilization; functional modification of building materials; pavement materials and mechanical behavior
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
School of Infrastructure Engineering, Dalian University of Technology, No. 2, Linggong Road, Ganjingzi District, Dalian 116024, China
Interests: functional modification of building materials; functional conversion and utilization of solid wastes; finite element calculation of infrastructure structures; damage mechanics
Special Issues, Collections and Topics in MDPI journals

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Guest Editor Assistant
School of Future Transportation, Guangzhou Maritime University, Guangzhou 510725, China
Interests: asphalt interface engineering; functional and protective coatings for pavements; self-healing asphalt materials; induction heating and conductive fillers; interlayer bonding and durability; data-driven modeling of pavement materials; sustainable pavement materials

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Guest Editor Assistant
School of Civil and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China
Interests: ocean engineering; disaster prevention and mitigation engineering; solid–liquid interface dynamic coupling; development of marine structure coatings

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Guest Editor Assistant
School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China
Interests: green and low-carbon road engineering materials; research on multiscale performance of pavement materials; lifecycle economic and environmental benefit analysis

Special Issue Information

Dear Colleagues,

Asphalt pavements serve as the backbone of global transportation infrastructure, widely applied in highways, municipal roads, and airport runways due to their excellent ride comfort and construction efficiency. However, during long-term service, they are constantly subjected to complex environmental stresses (e.g., UV radiation, thermal oxidation, freeze–thaw cycles) and repeated traffic loads, which easily trigger interfacial failures and surface deterioration. Notably, the performance and durability of asphalt pavements are largely determined by the behaviors of critical interfaces (such as asphalt–aggregate, asphalt–coating interfaces) and the effectiveness of surface protection measures; poor interfacial adhesion often leads to distresses like stripping and cracking, while inadequate surface protection accelerates asphalt aging and corrosion, significantly shortening service life and increasing maintenance costs. To meet the global demand for sustainable, high-performance transportation infrastructure, interface engineering (e.g., aggregate surface modification, compatibilizer addition to regulate interfacial compatibility and adhesion) and advanced functional coatings (e.g., antiaging, anticorrosion, antislip types) have emerged as core solutions. Aligned with Coatings’s focus on interface science and functional coatings, this Special Issue provides an interdisciplinary platform for researchers and engineers from road materials, interface chemistry, civil engineering, and related fields to present their innovative findings on asphalt interface engineering and coating technologies. It covers full-chain studies from the exploration of interfacial mechanisms and innovation of regulation technologies to the development of functional coatings and engineering application verification, aiming to promote technological innovation and advance the development of sustainable, long-lasting asphalt pavements.

In particular, the topics of interest for this Special Issue include, but are not limited to, the following:

  1. Asphalt interfacial mechanism and characterization;
  2. Asphalt interfacial regulation technologies;
  3. Advanced functional coatings for asphalt pavements;
  4. Durability of asphalt interfaces and coatings.

Dr. Peng Yin
Prof. Dr. Baofeng Pan
Guest Editors

Dr. Xiangqian Ye
Dr. Zeyang Zhou
Dr. Xiujie Quan
Guest Editor Assistants

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • asphalt interface engineering
  • functional coatings
  • interfacial regulation
  • pavement durability
  • sustainable pavements
  • surface modification

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Published Papers (3 papers)

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Research

20 pages, 1369 KB  
Article
Rheological Properties and Microscopic Mechanism of MMT-FA Composite Modified Asphalt
by Tao Zhang, Ping Zheng, Rui Hai, Baoyu Dong, Chao Pu, Erdeng Ai, Jiangao Zhang and Peng Yin
Coatings 2026, 16(9), 1032; https://doi.org/10.3390/coatings16091032 - 31 Aug 2026
Viewed by 226
Abstract
To enhance the high-temperature rutting resistance, fatigue performance and low-temperature cracking resistance of base asphalt, and promote the resource utilization of industrial solid waste, this study took 70# asphalt as the base asphalt and selected nano-montmorillonite (MMT) and fly ash (FA) as composite [...] Read more.
To enhance the high-temperature rutting resistance, fatigue performance and low-temperature cracking resistance of base asphalt, and promote the resource utilization of industrial solid waste, this study took 70# asphalt as the base asphalt and selected nano-montmorillonite (MMT) and fly ash (FA) as composite modified fillers. A series of composite modified asphalt samples was prepared with MMT:FA mass ratios of 1:2, 1:3 and 1:4 and total filler contents of 3%, 5% and 7%, respectively. Conventional physical tests, dynamic shear rheometry (DSR), multiple stress creep recovery (MSCR), linear amplitude sweep (LAS) and bending beam rheometry (BBR) were adopted to systematically evaluate the pavement rheological properties. The microscopic modification mechanism was revealed by thin-layer chromatography with flame ionization detection (TLC-FID) and gel permeation chromatography (GPC). The results show that MMT-FA composite filler can significantly reduce the penetration, increase the softening point, and greatly enhance the high-temperature rutting factor, creep-recovery rate and fatigue life of asphalt, while its influence on low-temperature performance is controllable. For the optimal group, S5, the rutting factor rises by 42.6% at 64 °C, and the fatigue life increases by 58.3% under 5.0% strain compared with the base asphalt. With the increase in filler content, the high-temperature and fatigue performance of asphalt increases first and then slows down, while the low-temperature stiffness rises gradually. Microscopic analysis indicates that the intercalation and strong adsorption of MMT restrict the light components of asphalt and increase the proportion of macromolecules, and FA plays the roles of particle filling and skeleton support. The two fillers synergistically optimize the colloid structure and molecular distribution of asphalt. Based on rheological properties and microscopic mechanism, the optimal ratio is 1:3 for MMT:FA with a total content of 5%, under which the composite modified asphalt achieves the best comprehensive pavement performance and can meet the requirements of heavy-load traffic and areas with large temperature differences. The research results can provide experimental and theoretical support for the material design, performance optimization and engineering application of MMT-FA composite modified asphalt. Full article
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18 pages, 6112 KB  
Article
Study on Permeability Performance of OGFC Steel Slag Skid-Resistant Wearing Course Based on Interconnected Void Characteristics
by Yanjun Liu, Dengyun Hou, Shuxin Zheng and Cheng Wan
Coatings 2026, 16(4), 440; https://doi.org/10.3390/coatings16040440 - 5 Apr 2026
Viewed by 600
Abstract
To investigate the effects of distribution characteristics of microscopic voids (including the connectivity degree, pore-throat morphology, and size) on the permeability performance of open-graded friction course (OGFC) asphalt mixtures with steel slag as the anti-skid wearing course, two-dimensional computed tomography (CT) images of [...] Read more.
To investigate the effects of distribution characteristics of microscopic voids (including the connectivity degree, pore-throat morphology, and size) on the permeability performance of open-graded friction course (OGFC) asphalt mixtures with steel slag as the anti-skid wearing course, two-dimensional computed tomography (CT) images of OGFC steel slag asphalt mixture specimens were first obtained via X-ray technology. The MATLAB R2022b-based image subtraction algorithm was then adopted to identify the interconnected voids inside the specimens to quantitatively characterize the morphological differences in interconnected voids in OGFC steel slag asphalt mixtures with different gradations. Furthermore, Finite Element simulation by ANSYS 2021 R1 was conducted to explore the influences of the diversion angle of interconnected voids on the water flow characteristics of OGFC steel slag asphalt mixtures, involving the variation laws of water flow velocity, water pressure and flow path in the diversion structure, thereby analyzing the resultant effects on the permeability performance of the mixtures. The results show that the combination of X-ray CT scanning and image processing technology enables more convenient, accurate and intuitive characterization of the internal void distribution characteristics of the mixtures. It was found that the pore-throat properties, including size, length, quantity and equivalent diameter, are the dominant factors restricting the permeability capacity of OGFC steel slag asphalt mixtures. As the diversion angle increases from 20° to 60°, the pressure gradient increases by up to 103.92%. After passing through the diversion section, the flow velocity increases by approximately four times. The streamline density at the channel axis is 4.2–4.5 times that near the channel wall. This study realizes the rapid extraction of void characteristics and the identification of key influencing factors on the permeability performance of OGFC steel slag asphalt mixtures, an achievement that cannot be attained by the previous macroscopic research on the permeability performance of such mixtures. Full article
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23 pages, 3514 KB  
Article
Study on the Influence of Modified Steel Slag Filler on the Rheological Properties and Moisture Stability of Asphalt Mastic
by Zhe Ma, Chao Pu, Guanghui Zhang, Bin Wang, Waiitii Litifu, Chunmei Liu, Sihua Li and Peng Yin
Coatings 2026, 16(3), 340; https://doi.org/10.3390/coatings16030340 - 9 Mar 2026
Cited by 5 | Viewed by 804
Abstract
Steel slag is a major solid waste generated by the steelmaking industry. Its characteristics, including high hardness and large specific surface area, offer the potential to replace traditional mineral fillers in asphalt mixtures. However, the high alkalinity of unmodified steel slag often leads [...] Read more.
Steel slag is a major solid waste generated by the steelmaking industry. Its characteristics, including high hardness and large specific surface area, offer the potential to replace traditional mineral fillers in asphalt mixtures. However, the high alkalinity of unmodified steel slag often leads to unbalanced rheological properties and insufficient moisture stability in asphalt mastic. In this study, a modified steel slag filler was prepared using a process involving crushing and screening, water washing for dealkalization, and surface modification with a silane coupling agent. Using limestone powder and hydrated lime as control groups, the modification effects on base asphalt mastic were systematically investigated. Rheological properties were characterized using a dynamic shear rheometer (DSR) and bending beam rheometer (BBR). Interfacial performance was evaluated through pull-off tests and water immersion dispersion tests. Furthermore, mechanisms were elucidated using X-ray Fluorescence (XRF), BET specific surface area analysis, and surface free energy (SFE) tests. The results indicate that the modified steel slag significantly enhances the high-temperature deformation resistance of the asphalt mastic. At 58 °C, the complex modulus reached 7.3 MPa, representing increases of 43.3% compared to limestone powder mastic. At −18 °C, the creep stiffness increased by only 3.0%, suggesting that low-temperature cracking resistance remained fundamentally stable. The water immersion dispersion loss rate was 2.12%, and the attenuation rate of pull-off strength after water immersion was 12.5%, indicating that its resistance to moisture damage is superior to that of limestone powder and comparable to that of hydrated lime. Mechanism analysis reveals that the large specific surface area of the modified steel slag strengthens physical adsorption, while the basic oxides undergo a weak acid–base reaction with the acidic components of the asphalt. Additionally, surface modification improves compatibility. The preparation process for modified steel slag is simple; it can be used as a standalone substitute for traditional mineral fillers, balancing both performance and environmental benefits. Full article
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