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学者姓名：徐松
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Abstract ：
To investigate the effects of ionic emulsifiers on the stabilization of emulsified asphalt, this paper used the Materials Studio software package to model a two-layer structure consisting of asphalt-emulsifier-water-emulsifier-asphalt. The principles of molecular dynamics were used to simulate the emulsified asphalt solution with various types of ionic emulsifier molecules. The effects of the anionic (SDS)/cationic (CTAB) emulsifiers on the stability of the emulsified asphalt were studied and compared. The following performance metrics were investigated: the interfacial monolayer morphology of the emulsifier molecules; the interaction energy between the emulsifier molecules and the water molecules; and the interaction energy between the emulsifier molecules and the asphalt phase/water phase. The results showed that, compared with CTAB emulsifier molecules, SDS emulsifier molecules had a higher extent of aggregation in the emulsified asphalt model system. The binding ability between the SDS emulsifier and the water molecules was stronger than that of the CTAB emulsifier molecules and negatively affects the stability of emulsified asphalt. Compared with the CTAB emulsified asphalt system, the SDS emulsified asphalt system has higher binding energy. In general, the stability of the CTAB-emulsified asphalt system is better than that of the SDS-emulsified asphalt system.
Keyword ：
Electrostatic potential Electrostatic potential Emulsified asphalt Emulsified asphalt Emulsifier Emulsifier Molecular simulation Molecular simulation Stability Stability
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| GB/T 7714 | Yuan, Yan , Chen, Hongyu , Wang, Yefei et al. Effect of Ionic Emulsifiers on the Stability of Emulsified Asphalt Based on Molecular Dynamics Simulation [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2025 , 37 (3) . |
| MLA | Yuan, Yan et al. "Effect of Ionic Emulsifiers on the Stability of Emulsified Asphalt Based on Molecular Dynamics Simulation" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 37 . 3 (2025) . |
| APA | Yuan, Yan , Chen, Hongyu , Wang, Yefei , Xu, Song , Xue, Bin . Effect of Ionic Emulsifiers on the Stability of Emulsified Asphalt Based on Molecular Dynamics Simulation . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2025 , 37 (3) . |
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gamma- aminopropyltriethoxy silane organic layered double hydroxides (LDHs) and SBS were combined into LDHs/SBS composite to improve anti-ageing performance of SBS modified bitumen (SMB). XPS and SEM showed that organic LDHs (OLDHs) was successfully grafted onto SBS, and OLDHs could be more evenly distributed in SBS, which was conducive to improve the anti-degradation capability of SBS. Compared with SBS and LDHs/SBS composite, the interaction between OLDHs/SBS composite and bitumen was stronger, resulting in the better stabilization of SBS and LDHs in bitumen. Furthermore, OLDHs/SBS composite could enhance the hightemperature property of SMB. SMB became hard and brittle during ageing, the physical and rheological properties were remarkably deteriorated. LDHs/SBS and OLDHs/SBS composite could alleviate the damage of ageing on the highand low-temperature performance of SMB and enhance the anti-ageing capacity, particularly OLDHs/SBS composite. Then, the improvement mechanism of OLDHs/SBS and LDHs/SBS composite on the anti- ageing capability of SMB was analyzed at microscopic scale. LDHs/SBS and OLDHs/SBS composite could hinder the infiltration of oxygen into bitumen and decrease the oxygen content, and simultaneously decelerate the oxygen diffusion rate in bitumen. The synergistic combination of these two functions conspicuously diminished the probability of oxygen colliding with bitumen or SBS, which relieved the ageing of bitumen and the degradation of SBS, and ultimately improved the anti-ageing capability of SMB. Furthermore, due to the better stability, the effectiveness of OLDHs/SBS composite was more notable than LDHs/SBS composite, OLDHs/SBS composite demonstrated superior improvement on the anti-ageing capability of SMB than LDHs/SBS composite.
Keyword ：
Anti-ageing ability Anti-ageing ability Bitumen Bitumen LDHs/SBS composite LDHs/SBS composite Molecular dynamics simulation Molecular dynamics simulation Rheological properties Rheological properties
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| GB/T 7714 | Zhang, Canlin , Yang, Shuai , Wang, Ting et al. A novel method to improve the anti-ageing ability of bitumen by organic LDHs/SBS composite: Preparation, performance evaluation and mechanism analysis [J]. | FUEL , 2025 , 383 . |
| MLA | Zhang, Canlin et al. "A novel method to improve the anti-ageing ability of bitumen by organic LDHs/SBS composite: Preparation, performance evaluation and mechanism analysis" . | FUEL 383 (2025) . |
| APA | Zhang, Canlin , Yang, Shuai , Wang, Ting , Xu, Song , Jin, Peng , Dong, Hongjun et al. A novel method to improve the anti-ageing ability of bitumen by organic LDHs/SBS composite: Preparation, performance evaluation and mechanism analysis . | FUEL , 2025 , 383 . |
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在南方潮湿多雨地区,红黏土路基易出现沉降过大、不均匀沉降等病害,为研究在干湿循环作用下纤维红黏土的抗剪强度特性,将聚丙烯纤维掺入红黏土中,形成纤维红黏土.通过直接剪切试验,研究了不同纤维掺量(0‰、2‰、6‰、10‰)、纤维长度(0、3、6、9 mm)和干湿循环次数(0、2、4、6 次)对红黏土抗剪强度特性的影响.结果表明:掺入纤维可显著提升红黏土的抗剪强度,在研究的掺量与长度范围内,抗剪强度随纤维掺量和长度的增加而增大;纤维在提高红黏土的黏聚力效果显著,而对于内摩擦角的提升有限;纤维长度为 6mm时,红黏土抗剪强度最大;干湿循环会显著降低红黏土强度,且对黏聚力劣化作用超过了内摩擦角,在干湿循环作用下,纤维和法向压力可降低干湿循环对红黏土的劣化作用.笔者基于试验结果,利用反向传播(BP)神经网络技术,建立了红黏土在干湿循环作用下的强度预测模型,其预测相对误差值在 10%以下.
Keyword ：
干湿循环试验 干湿循环试验 抗剪强度 抗剪强度 神经网络模型 神经网络模型 红黏土 红黏土 道路工程 道路工程
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| GB/T 7714 | 马宏岩 , 翁明胜 , 黄仁杰 et al. 干湿循环下聚丙烯纤维改良红黏土抗剪强度特性及预测模型 [J]. | 重庆交通大学学报（自然科学版） , 2025 , 44 (3) : 33-39 . |
| MLA | 马宏岩 et al. "干湿循环下聚丙烯纤维改良红黏土抗剪强度特性及预测模型" . | 重庆交通大学学报（自然科学版） 44 . 3 (2025) : 33-39 . |
| APA | 马宏岩 , 翁明胜 , 黄仁杰 , 徐松 , 郑丽堂 . 干湿循环下聚丙烯纤维改良红黏土抗剪强度特性及预测模型 . | 重庆交通大学学报（自然科学版） , 2025 , 44 (3) , 33-39 . |
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SBS modified bitumen (SMB) is widely used for its excellent physical and rheological properties, but it is susceptible to aging due to exposure to environmental factors such as heat, light, and oxygen. This aging process involves bitumen aging and SBS degradation, which complicates the rejuvenation of SMB. In order to explore the rejuvenation mechanism of aged SMB, particularly emphasizing the rejuvenation effects of epoxy compounds (BUDGE, TMPGE, and RDGE), a combination of molecular dynamics simulation and experiments was employed. The thermodynamic, chemical, and physical properties of rejuvenated SMB were analyzed. Results show that BUDGE and its repaired SBS exhibit excellent flexibility compared to TMPGE, improving cohesive energy density and free volume of aged bitumen, which facilitates recovery of ductility in aged SMB. Conversely, SBS repaired with RDGE increases cohesive energy density of aged SMB while reducing free volume, which enhances stiffness of bitumen. Additionally, rigid groups in RDGE inhibit mobility of both itself and the repaired SBS, leading to a reduction in the ductility of aged SMB to 10.1 cm. Besides, SBS repaired with RDGE shows strongest binding with resins and aromatics, which diminishes lubricating effect of these components on asphaltenes. This reduction in lubrication enhances aggregation of asphaltenes, ultimately raising flow resistance.
Keyword ：
Epoxy compounds Epoxy compounds Molecular dynamics simulation Molecular dynamics simulation Rejuvenated SBS modified bitumen Rejuvenated SBS modified bitumen Rejuvenation mechanism analysis Rejuvenation mechanism analysis
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| GB/T 7714 | Xu, Song , Niu, Xiangjie , Cai, Shaoxu et al. Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics [J]. | POLYMER DEGRADATION AND STABILITY , 2025 , 238 . |
| MLA | Xu, Song et al. "Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics" . | POLYMER DEGRADATION AND STABILITY 238 (2025) . |
| APA | Xu, Song , Niu, Xiangjie , Cai, Shaoxu , Xu, Bingtao , Fang, Lei , Cao, Zhilong et al. Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics . | POLYMER DEGRADATION AND STABILITY , 2025 , 238 . |
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The diglycidyl ether (HDDGE) and dicyclohexylmethane diisocyanate (HMDI) are widely adopted as active rejuvenators in the field of regenerated SBS modified bitumen (RSMB), which can react with the oxygen-containing functional group on the aged SBS, thereby rebuilding the crosslinking net of the SBS. Numerous measurements indicate that HDDGE negatively affects the high-temperature performance of RSMB, while HMDI impairs its low-temperature performance. This unexplained phenomenon continues to impede the effective regeneration of bitumen. To reveal the underlying mechanism of this phenomenon, this study investigates the SBS-bitumen interface inside the RSMB thought the molecular dynamics simulation, and conducts the experiments in the lab to prove the inference. Results indicated that the type and dosage of rejuvenators will affect the H-bonds inside regenerated SBS, which will change the configuration of SBS molecules. Subsequently, the regenerated SBS molecules will redetermine the fractions located at the SBS-bitumen interface thought the space steric hindrance effect and interaction between SBS and bitumen, which will alter the colloid structure of RSMB. This will significantly change the free volume of the RSMB, and will finally affect the macro-properties of RSMB. © 2025 Elsevier B.V.
Keyword ：
1 1 6-Hexanediol diglycidyl ether 6-Hexanediol diglycidyl ether Crosslinking kinetics Crosslinking kinetics Dicyclohexylmethane diisocyanate Dicyclohexylmethane diisocyanate Regenerated SBS modified bitumen Regenerated SBS modified bitumen Sustainable development Sustainable development
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| GB/T 7714 | Xu, S. , Cai, S. , Nui, X. et al. Action mechanism of different active rejuvenators on the colloid structure of regenerated Styrene-butadiene-Styrene block copolymer modified bitumen: A perspective from Styrene-butadiene-Styrene block copolymer-bitumen interface [J]. | Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2025 , 718 . |
| MLA | Xu, S. et al. "Action mechanism of different active rejuvenators on the colloid structure of regenerated Styrene-butadiene-Styrene block copolymer modified bitumen: A perspective from Styrene-butadiene-Styrene block copolymer-bitumen interface" . | Colloids and Surfaces A: Physicochemical and Engineering Aspects 718 (2025) . |
| APA | Xu, S. , Cai, S. , Nui, X. , Cao, Z. , Fang, L. , Zhang, D. et al. Action mechanism of different active rejuvenators on the colloid structure of regenerated Styrene-butadiene-Styrene block copolymer modified bitumen: A perspective from Styrene-butadiene-Styrene block copolymer-bitumen interface . | Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2025 , 718 . |
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As a polymer-like organic material, asphalt often undergoes aging during service life. Regeneration technology is the main approach to achieve its recycling; therefore, the rejuvenator is an important factor affecting the regeneration effect. In order to evaluate the rejuvenation effects of rejuvenators on aged asphalt, fluid catalytic cracking (FCC) slurry and a penetrant containing epoxy functional groups were used to prepare conventional rejuvenators (CR1 and CR2) and a penetrable rejuvenator (PR). The impact of the penetrant on the physical properties of the rejuvenator was investigated, and the rejuvenation effects of different rejuvenators on mild and severe aged asphalt were evaluated through physical and rheological tests. Results show that the penetrant effectively lubricates the movement of rejuvenator molecules, improving the high temperature stability and aging resistance of the rejuvenator. CR1 and CR2 are more suitable for mild aged asphalt, as mild aging has a relatively minimal effect on the chemical composition and colloidal structure of asphalt. At a 25% dosage, the PR significantly restores the physical properties of severe aged asphalt, while CR1 and CR2 still fail to meet specifications. The PR is more effective for severe aged asphalt because it not only dissolves and disperses asphaltenes but also weakens interactions between asphaltenes, which facilitates a more effective restoration of the colloidal structure and significantly enhances the rejuvenation effect. The findings of this study provide insights into the design of penetrable rejuvenators for a more efficient utilization of reclaimed asphalt pavement (RAP).
Keyword ：
aged asphalt aged asphalt conventional rejuvenator conventional rejuvenator penetrable rejuvenator penetrable rejuvenator physical and rheological properties physical and rheological properties rejuvenation effect rejuvenation effect
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| GB/T 7714 | Wang, Jian , Xu, Song , Chen, Jiang et al. Evaluation of Regeneration Effects of Different Rejuvenators on Aged Asphalt [J]. | BUILDINGS , 2025 , 15 (7) . |
| MLA | Wang, Jian et al. "Evaluation of Regeneration Effects of Different Rejuvenators on Aged Asphalt" . | BUILDINGS 15 . 7 (2025) . |
| APA | Wang, Jian , Xu, Song , Chen, Jiang , Xie, Weibin , Cheng, Xuehong , Wang, Jiahao et al. Evaluation of Regeneration Effects of Different Rejuvenators on Aged Asphalt . | BUILDINGS , 2025 , 15 (7) . |
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To solve the problems on resource utilization and environmental pollution of waste concrete and waste polypropylene (PP) plastics, the recycling of them into asphalt pavement is a feasible approach. Considering the high melting temperature of waste PP, this study adopted a thermal-and-mechanochemical method to convert waste PP into high-performance warm-mix asphalt modifiers (PPMs) through the hybrid use of dicumyl peroxide (DCP), maleic anhydride (MAH), and epoxidized soybean oil (ESO) for preparing an asphalt mixture (RCAAM) containing recycled concrete aggregate (RCA). For the prepared RCAAM containing PPMs, the mixing temperature was about 30 °C lower than that of the hot-mix RCAAM containing untreated PP. Further, the high-temperature property, low-temperature crack resistance, moisture-induced damage resistance, and fatigue resistance of the RCAAM were characterized. The results indicated that the maximum flexural strain of the RCAAM increased by 7.8~21.4% after using PPMs, while the sectional fractures of the asphalt binder were reduced after damaging at low temperature. The use of ESO in PPMs can promote the cohesion enhancement of the asphalt binder and also improve the high-temperature deformation resistance and fatigue performance of the RCAAM. Notably, the warm-mix epoxidized PPMA mixture worked better close to the hot-mix untreated PPMA mixture, even after the mixing temperature was reduced by 30 °C. © 2024 by the authors.
Keyword ：
asphalt mixture asphalt mixture recycled concrete aggregate recycled concrete aggregate road performance road performance warm-mix asphalt modifiers warm-mix asphalt modifiers waste concrete waste concrete waste polypropylene (PP) plastics waste polypropylene (PP) plastics
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| GB/T 7714 | Hu, J. , Jiang, X. , Chu, Y. et al. Mechanochemical Upcycling of Waste Polypropylene into Warm-Mix Modifier for Asphalt Pavement Incorporating Recycled Concrete Aggregates [J]. | Polymers , 2024 , 16 (17) . |
| MLA | Hu, J. et al. "Mechanochemical Upcycling of Waste Polypropylene into Warm-Mix Modifier for Asphalt Pavement Incorporating Recycled Concrete Aggregates" . | Polymers 16 . 17 (2024) . |
| APA | Hu, J. , Jiang, X. , Chu, Y. , Xu, S. , Xu, X. . Mechanochemical Upcycling of Waste Polypropylene into Warm-Mix Modifier for Asphalt Pavement Incorporating Recycled Concrete Aggregates . | Polymers , 2024 , 16 (17) . |
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To investigate the intrinsic self-healing behavior of terminal blend (TB)-modified asphalt (TBMA), this study establishes four models of matrix asphalt, TBMA, TBMA containing styrene-butadiene-styrene (TB_SBS), and TBMA containing ethylene vinyl acetate (TB_EVA) based on molecular dynamics, and the self-healing ability of the four types of asphalt was evaluated by means of the diffusion coefficient, diffusion activation energy, and pre-exponential factor. Finally, the study analyzes and validates the self-healing performance of the asphalt through fatigue shear-healing tests. The results showed that the self-healing potentials of the four types of asphalt, as determined by the diffusion coefficient, diffusion activation energy, and pre-exponential factor, were (in descending order) TB_SBS, TBMA, TB_EVA, and matrix asphalt. In addition, the diffusion coefficient of the TBMA was increased relative to the matrix asphalt, SBS polymer further increased the diffusion coefficient, and EVA modifier had an inhibitory effect, which was related to the viscoelasticity and mechanical performance of the material. Besides, the diffusion coefficient enhancement effect of the SBS modifier on the TBMA was greater than the inhibition effect, which mainly derived from the enhancement of the diffusion coefficient of lightweight components in significantly enhancing the self-healing ability the TBMA. From microscopic and macroscopic scales, the shear-fatigue healing tests showed excellent correlation with the simulation results, demonstrating that molecular dynamics can be used to model the self-healing process of asphalt. © 2024
Keyword ：
Diffusion coefficient Diffusion coefficient Molecular dynamics Molecular dynamics Road engineering Road engineering Self-healing Self-healing Terminal blend Terminal blend
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| GB/T 7714 | Yuan, Y. , Lin, M. , Xu, S. et al. Analysis of the self-healing mechanism of TB compound-modified asphalt based on molecular dynamics [J]. | Case Studies in Construction Materials , 2024 , 21 . |
| MLA | Yuan, Y. et al. "Analysis of the self-healing mechanism of TB compound-modified asphalt based on molecular dynamics" . | Case Studies in Construction Materials 21 (2024) . |
| APA | Yuan, Y. , Lin, M. , Xu, S. , Wang, Y. , Chen, H. , Zheng, Z. . Analysis of the self-healing mechanism of TB compound-modified asphalt based on molecular dynamics . | Case Studies in Construction Materials , 2024 , 21 . |
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In this study, compound regeneration of SBS-modified bitumen (SMB) was carried out by a composite rejuvenator composed of furfural extraction oil (FEO) and 1,6-hexanediol diglycidyl ether (HDDGE) in the presence of catalyst triethanolamine (TEOA). SMB was subjected to three aging-regeneration cycles, and the physical and rheological properties, toughness and tenacity, and chemical structures of the SMB after each aging-regeneration cycle were tested to investigate the regeneration effect of the composite rejuvenator on SMB at different numbers of cycles. The ductility decreases and low-temperature properties deteriorate as the number of cycles increased, but the high-temperature properties of the SMB are improved. The complex modulus aging index and phase angle aging index indicate that the viscous behavior of SMB weakens after the second and third aging. The degree of viscoelasticity and toughness recovery decreases with the increase in the number of cycles, and the tenacity of SMB after the third aging-regeneration cycle is basically lost. The results of the Fourier transform infrared (FTIR) spectra tests prove that with the increase in the aging–regeneration cycles of SMB, the intensity of FTIR peaks of oxygen-containing functional groups is greater, and the recovery of aged SMB is gradually weakened. © 2024 by the authors.
Keyword ：
aging-regeneration cycle aging-regeneration cycle composite rejuvenator composite rejuvenator physical property physical property rheological property rheological property SBS modified bitumen SBS modified bitumen
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| GB/T 7714 | Xu, S. , Xu, B. , Liulin, S. et al. Performance Evaluation of Multiple Aging-Regeneration of SBS-Modified Bitumen Regenerated by a Composite Rejuvenator [J]. | Buildings , 2024 , 14 (7) . |
| MLA | Xu, S. et al. "Performance Evaluation of Multiple Aging-Regeneration of SBS-Modified Bitumen Regenerated by a Composite Rejuvenator" . | Buildings 14 . 7 (2024) . |
| APA | Xu, S. , Xu, B. , Liulin, S. , Cai, S. , Tang, G. , Pan, S. . Performance Evaluation of Multiple Aging-Regeneration of SBS-Modified Bitumen Regenerated by a Composite Rejuvenator . | Buildings , 2024 , 14 (7) . |
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Red clay was a special roadbed filling soil that was easy to expand and shrink because of the characteristics of high liquid limit and high porosity, leading to the appearance of a large number of cracks. In order to understand the cracking mechanism and nonlinear fracture failure process of red clay, the fracture toughness and crack sensitivity of red clay with different saturation, compaction and gravel content were analyzed by three-point bending cracking experiment and Image processing technology, and then the cohesive crack model was established to describe the fracture toughness. The results showed that the cracking process of red clay could be divided into three stages: crack incubation period, crack initiation and propagation period and visible cracks appearance stage. There was a conic function relationship between fracture toughness and saturation and a positive correlation between fracture toughness and compactness. The influence of gravel content on the final fracture path of red clay was the most significant, while the effects of saturation and compaction could be ignored. In addition, the fracture toughness converted from the cohesive crack model was basically as the same as the measured. This work provided a basis for theoretical analysis and numerical calculation for the fracture toughness of red clay under three-point bending. © 2024 Elsevier Ltd
Keyword ：
Compaction Compaction Cracks Cracks Ductile fracture Ductile fracture Fracture toughness Fracture toughness Gravel Gravel Image processing Image processing
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| GB/T 7714 | Ma, Hongyan , Su, Wentao , Cheng, Peiyuan et al. Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending [J]. | Theoretical and Applied Fracture Mechanics , 2024 , 133 . |
| MLA | Ma, Hongyan et al. "Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending" . | Theoretical and Applied Fracture Mechanics 133 (2024) . |
| APA | Ma, Hongyan , Su, Wentao , Cheng, Peiyuan , Xu, Song , Lv, Mengxi . Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending . | Theoretical and Applied Fracture Mechanics , 2024 , 133 . |
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