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学者姓名：袁燕
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Abstract ：
为探究沥青材料的自愈合性能，基于分子动力学模拟，利用Materials Studio软件建立基质沥青、 SBS(styrene-butadiene-styrene)改性沥青、老化沥青以及老化SBS改性沥青的三维微裂缝模型；通过密度分析、相对浓度分布以及自由体积分数等方法，分析自愈合模型的愈合情况.结果表明，SBS改性剂对沥青的自愈有一定的促进作用，老化对沥青的自愈有一定的抑制作用，4种沥青的自愈潜力从大到小依次为SBS改性沥青、基质沥青、老化后SBS改性沥青以及老化沥青.
Keyword ：
分子动力学 分子动力学 扩散系数 扩散系数 沥青胶结料 沥青胶结料 自愈合 自愈合
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| GB/T 7714 | 袁燕 , 陈宏宇 , 王叶飞 et al. 分子动力学的不同沥青分子自愈机制分析 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (03) : 307-315 . |
| MLA | 袁燕 et al. "分子动力学的不同沥青分子自愈机制分析" . | 福州大学学报(自然科学版) 52 . 03 (2024) : 307-315 . |
| APA | 袁燕 , 陈宏宇 , 王叶飞 , 徐松 , 薛斌 . 分子动力学的不同沥青分子自愈机制分析 . | 福州大学学报(自然科学版) , 2024 , 52 (03) , 307-315 . |
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In this study, a novel approach based on Munsell value was established to reveal the relationship between the aging degree and color vision of asphalt. Five different asphalt binders were treated by three types of aging protocols such as thin film oven test (TFOT), pressure aging vessel (PAV), and ultraviolet (UV) radiation, then the effects of each aging treatment on the ductility and color spectrum (collected by a spectrometer, AvaField-3) of the binders were studied. The results show that the ductility of five binders is decreased after the three aging modes (including TFOT, PAV and UV aging), nevertheless, the Munsell values show different behaviors, they become smaller after TFOT and PAV aging while becoming larger after UV aging. Scanning electron microscope (SEM) photographs show that the UV aging leads to a transformation of the binder's surface from smooth to pleated, thus the specular reflection of the asphalt surface changes into diffuse reflection, resulting in an increase in Munsell value of asphalt after UV aging. Meanwhile, the variation of Munsell value for the asphalt after UV aging is larger than that for asphalt after thermal oxidative aging, resulting in the increase of Munsell value of asphalt which undergoes thermal oxidative aging and UV aging. Based on field data collection and analysis, a linear regression equation (R2 = 0.915) is established between the Munsell value and the service life of asphalt pavement, which shows that the asphalt pavement will become white with the service life-prolonging. Based on this study, the method of Munsell value can be a promising approach to evaluate the aging degree of asphalt pavement.
Keyword ：
Aging Aging Asphalt Asphalt Ductility Ductility Munsell value Munsell value Scanning electron microscope Scanning electron microscope
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| GB/T 7714 | Xu, Song , Wang, Yefei , Fang, Lei et al. A Novel Approach Based on Munsell Value for the Evaluation of Asphalt Aging Degree [J]. | INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY , 2024 . |
| MLA | Xu, Song et al. "A Novel Approach Based on Munsell Value for the Evaluation of Asphalt Aging Degree" . | INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY (2024) . |
| APA | Xu, Song , Wang, Yefei , Fang, Lei , Zhang, Canlin , Jia, Xiaojuan , Yuan, Yan . A Novel Approach Based on Munsell Value for the Evaluation of Asphalt Aging Degree . | INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY , 2024 . |
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Asphalt mixture is a typical granular material, and its macroscopic properties are closely related to the interaction behavior of aggregate particles at the micro scales. Discrete element method (DEM), as an important numerical simulation method in granular mechanics, plays an increasingly important role in analyzing the aggregate packing characteristics, skeleton features, predicting mechanical and pavement performance of asphalt mixtures. However, the complexity of the composition of asphalt mixtures, including the particle size, shape, spatial distribution of aggregate particles, and the viscoelasticity of asphalt binders sensitive to temperature, load, and time, increases the difficulty of constructing DEM models of asphalt mixtures, selecting contact constitutive models, and determining parameters, which directly affects the accuracy and efficiency of DEM simulations. In this review, the generation methods of idealized models, image models, and user-defined models currently used to generate DEM models of asphalt mixtures were summarized in detail. Conventional contact constitutive models, including elastic and viscoelastic contact stiffness constitutive models, as well as fracture models including bonding models and cohesive softening models, were discussed. Moreover, special contact constitutive models, such as damage, self-healing, and two-stage contact models considering compaction evolution, were also summarized and discussed. Then, the contact constitutive model parameters were classified and related determination methods were summarized, and the latest application directions of DEM in current asphalt mixture research were classified. On this basis, relevant discussions were carried out, and the challenges and future development prospects faced by DEM in asphalt mixture research were proposed.
Keyword ：
Application Application Asphalt mixture Asphalt mixture Contact constitutive model Contact constitutive model Discrete element method Discrete element method Model generation method Model generation method
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| GB/T 7714 | Xue, Bin , Que, Yun , Pei, Jianzhong et al. A state-of-the-art review of discrete element method for asphalt mixtures: Model generation methods, contact constitutive models and application directions [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 414 . |
| MLA | Xue, Bin et al. "A state-of-the-art review of discrete element method for asphalt mixtures: Model generation methods, contact constitutive models and application directions" . | CONSTRUCTION AND BUILDING MATERIALS 414 (2024) . |
| APA | Xue, Bin , Que, Yun , Pei, Jianzhong , Ma, Xiaoyan , Wang, Di , Yuan, Yan et al. A state-of-the-art review of discrete element method for asphalt mixtures: Model generation methods, contact constitutive models and application directions . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 414 . |
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为探究不同离子乳化剂对乳化沥青稳定性产生的不同影响，基于分子动力学模拟，利用Materials Studio软件构建“沥青-乳化剂-水-乳化剂-沥青”双层模型结构，模拟含不同离子乳化剂分子的乳化沥青体系，对比研究阴（SDS）/阳（CTAC）离子乳化剂对乳化沥青稳定性的影响.对比加入不同乳化剂分子后，沥青乳液的相对浓度分布、界面膜厚度、界面形成能以及静电势（ESP）的变化，分析乳化沥青的稳定性.结果表明，相较于加入CTAC乳化剂的沥青乳液，SDS乳化剂更能增大沥青与水之间界面层的厚度，减小两相的界面张力，提高乳化沥青的稳定性；从静电势角度分析，相较于CTAC乳化剂，SDS乳化剂分子烷烃链的静电势极大值更大，更易与静电势为负值的原子相结合.因此，加入SDS乳化剂的乳化沥青，其整体稳定性能要优于加入CTAC乳化剂的乳化沥青.
Keyword ：
乳化剂 乳化剂 乳化沥青 乳化沥青 分子模拟 分子模拟 稳定性 稳定性 静电势 静电势
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| GB/T 7714 | 袁燕 , 陈宏宇 , 王叶飞 et al. 离子乳化剂对乳化沥青稳定性影响的分子模拟 [J]. | 湖南大学学报(自然科学版) , 2024 , 51 (03) : 51-58 . |
| MLA | 袁燕 et al. "离子乳化剂对乳化沥青稳定性影响的分子模拟" . | 湖南大学学报(自然科学版) 51 . 03 (2024) : 51-58 . |
| APA | 袁燕 , 陈宏宇 , 王叶飞 , 徐松 , 薛斌 . 离子乳化剂对乳化沥青稳定性影响的分子模拟 . | 湖南大学学报(自然科学版) , 2024 , 51 (03) , 51-58 . |
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To investigate the different effects of different ionic emulsifiers on the stability of emulsified asphalt，based on molecular dynamics simulation， the double-layer model structure of 'asphalt-emulsifier-water-emulsifier-asphalt'was constructed by using Materials Studio software，and emulsified asphalt systems containing different ionic emulsifier molecules were simulated to compare the effect of anionic （SDS）/cationic （CTAC）emulsifiers on the stability of emulsified asphalt. The changes in the relative concentration distribution，interfacial film thickness，interfacial formation energy，and electrostatic potential （ESP） of the asphalt emulsions were compared with the addition of different emulsifier molecules in order to analyze the stability of the emulsified asphalt. The results show that the SDS emulsifier increases the thickness of the interfacial layer between asphalt and water，reduces the interfacial tension between the two phases，and improves the stability of the emulsified asphalt，compared with the CTAC emulsifier. From the perspective of electrostatic potential analysis，compared with CTAC emulsifier，SDS emulsifier molecule has a larger maximum electrostatic potential of the alkane chain，and it is more likely to bond with atoms with negative electrostatic potential. Therefore，the overall stability of emulsified asphalt with an SDS emulsifier is better than that of emulsified asphalt with a CTAC emulsifier. © 2024 Hunan University. All rights reserved.
Keyword ：
Asphalt Asphalt Computer software Computer software Electrostatics Electrostatics Emulsification Emulsification Molecular dynamics Molecular dynamics Molecules Molecules Stability Stability
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| GB/T 7714 | Yuan, Yan , Chen, Hongyu , Wang, Yefei et al. Molecular Simulation on Effect of Ionic Emulsifiers on Stability of Emulsified Asphalt [J]. | Journal of Hunan University Natural Sciences , 2024 , 51 (3) : 51-58 . |
| MLA | Yuan, Yan et al. "Molecular Simulation on Effect of Ionic Emulsifiers on Stability of Emulsified Asphalt" . | Journal of Hunan University Natural Sciences 51 . 3 (2024) : 51-58 . |
| APA | Yuan, Yan , Chen, Hongyu , Wang, Yefei , Xu, Song , Xue, Bin . Molecular Simulation on Effect of Ionic Emulsifiers on Stability of Emulsified Asphalt . | Journal of Hunan University Natural Sciences , 2024 , 51 (3) , 51-58 . |
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Snow and ice on the pavement surfaces in winter seriously threaten the traffic safety. This study prepared high-elastic/salt-storage (HESS) asphalt mixtures containing rubber particles (RP) and self-developed salt-storage fillers to improve deicing performance in various aspects. Specifically, the RP was incorporated into the asphalt mixture by replacing 1 %, 2 %, and 3 % of fine aggregate by mass and the self-developed salt-storage filler was incorporated into the asphalt mixture to replace 25 %, 50 %, and 75 % of the mineral filler by equal volume. Hydrated lime was used as a mineral filler to enhance the asphalt mixtures’ water damage resistance. The pavement performance of HESS asphalt mixtures was first studied. The pull-out and fall ball impact tests were designed to investigate the composite deicing effect of RP and salt-storage filler on the asphalt mixtures. A self-designed rainfall simulation test was used to assess the long-term deicing performance of HESS asphalt mixtures. Results showed that the incorporation of RP improves the high-temperature stability and low-temperature crack resistance of the mixtures, but negatively affects their water damage resistance. The RP content should not exceed 3 % to guarantee water damage resistance. Due to combining effects RP and salt-storage fillers, the deicing performance of HESS asphalt mixtures has been improved by 15.9 % and 10.6 % as compared to the addition of RP and salt-storage fillers separately. It is recommended to replace the fine aggregates with the RP at content of 1.5–3 % by mass and 60–75 % mineral filler with the salt-storage filler by volume. © 2024 Elsevier Ltd
Keyword ：
Deicing performance Deicing performance High-elastic/salt-storage asphalt mixture High-elastic/salt-storage asphalt mixture Long-term deicing performance Long-term deicing performance Rubber particle Rubber particle Salt-storage filler Salt-storage filler
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| GB/T 7714 | Zou, G. , Chen, Q. , Jiao, Y. et al. Research on deicing performance of high-elastic/salt-storage asphalt mixture containing rubber particle and self-developed salt-storage filler [J]. | Construction and Building Materials , 2024 , 449 . |
| MLA | Zou, G. et al. "Research on deicing performance of high-elastic/salt-storage asphalt mixture containing rubber particle and self-developed salt-storage filler" . | Construction and Building Materials 449 (2024) . |
| APA | Zou, G. , Chen, Q. , Jiao, Y. , Yuan, Y. , Zhang, Y. , Yu, J. . Research on deicing performance of high-elastic/salt-storage asphalt mixture containing rubber particle and self-developed salt-storage filler . | Construction and Building Materials , 2024 , 449 . |
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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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为提高现有沥青路面压实密度预测模型预测能力,以厦门翔安机场高速公路的路面段为试验场地,选取分别代表振压过程中谐波比、能量和力学变化的压实控制值CCV、耗散测量值DMV、振动压实值VCV以及温度作为监测指标,采用孤立森林算法进行监测指标异常点识别,基于最小偏二乘回归建立多指标沥青路面压实密度预测模型.结果表明:孤立森林算法可有效识别高维数据异常点,弥补传统方法只能处理一维数据的不足;温度与其他监测指标以及沥青路面密度存在不同程度正相关关系;基于CCV、DMV、VCV的多元回归模型拟合性能优于一元回归模型性能,论证了多指标评价方法可行性;最小偏二乘回归可改善自变量间共线性对模型权重的影响,解决温度权重与实际物理意义相互颠倒的问题;相比普通多元线性回归,最小偏二乘回归能进一步提高模型拟合能力,模型最终在训练集上的决定系数为0.83,在测试集上的决定系数为0.81,具有良好的沥青路面压实密度预测能力.
Keyword ：
孤立森林 孤立森林 智能压实 智能压实 智能压实测量值 智能压实测量值 最小偏二乘回归 最小偏二乘回归 沥青路面 沥青路面
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| GB/T 7714 | 阙云 , 戴伊 , 薛斌 et al. 沥青路面压实密度多指标智能预测模型 [J]. | 湖南大学学报（自然科学版） , 2024 , 51 (11) : 147-157 . |
| MLA | 阙云 et al. "沥青路面压实密度多指标智能预测模型" . | 湖南大学学报（自然科学版） 51 . 11 (2024) : 147-157 . |
| APA | 阙云 , 戴伊 , 薛斌 , 章灿林 , 牟宏霖 , 袁燕 . 沥青路面压实密度多指标智能预测模型 . | 湖南大学学报（自然科学版） , 2024 , 51 (11) , 147-157 . |
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一些高黏改性沥青混合料采用干法施工,而其施工温度是采用湿法改性得到的高黏改性沥青来确定,二者存在匹配性问题.对SBS改性沥青运用湿法工艺添加高黏改性剂制得复合改性沥青,按等流动性通过黏温曲线与流动性-温度曲线分析复合改性沥青的可施工温度范围;通过试验对比不同成型温度下,干法高黏复合改性沥青混合料的高温性能、水稳定性以及体积指标,确定最佳的成型温度.试验结果表明,通过加高黏剂,改善了沥青的高温性能、黏韧性和低温抗裂性能,对干法添加的混合料,随着成型温度的提高,沥青混合料的高温性能持续增强,水稳定性先上升后下降,OGFC-5 干法高黏复合改性沥青混凝土的最佳成型温度区间为 165～175℃;湿法改性沥青的黏温曲线能在一定程度上反映干法改性沥青混合料的施工温度性能.
Keyword ：
成型温度 成型温度 流动性-温度曲线 流动性-温度曲线 高黏剂 高黏剂 高黏复合沥青 高黏复合沥青 黏温曲线 黏温曲线
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| GB/T 7714 | 王建华 , 赖益梁 , 郭成 et al. 成型温度对OGFC-5 干法高黏复合沥青混合料路用性能的影响 [J]. | 南昌大学学报（工科版） , 2023 , 45 (1) : 59-64,102 . |
| MLA | 王建华 et al. "成型温度对OGFC-5 干法高黏复合沥青混合料路用性能的影响" . | 南昌大学学报（工科版） 45 . 1 (2023) : 59-64,102 . |
| APA | 王建华 , 赖益梁 , 郭成 , 薛道耐 , 李慧峰 , 杨枫 et al. 成型温度对OGFC-5 干法高黏复合沥青混合料路用性能的影响 . | 南昌大学学报（工科版） , 2023 , 45 (1) , 59-64,102 . |
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为了准确分析水泥混凝土路面接缝填缝料的受力状态,基于粘弹试验测定了橡胶沥青填缝料的松弛蠕变曲线与松弛模量曲线,通过非线性拟合方法求得有限元软件ANSYS中用于描述粘弹类材料粘弹性质的广义Maxwell模型和Prony级数的两种表达方式所需的参数.并结合粘弹性材料时温等效性质,回归了主曲线函数力学参数,为建立接缝有限元动态分析模型,研究移动荷载与温度荷载作用下此类型水泥路面接缝填缝料的粘弹性力学响应分析提供了方法和基础.
Keyword ：
Maxwell模型 Maxwell模型 Prony级数 Prony级数 橡胶沥青填缝料 橡胶沥青填缝料 水泥路面 水泥路面 粘弹试验 粘弹试验
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| GB/T 7714 | 王建华 , 赖益梁 , 袁燕 et al. 基于橡胶沥青粘弹试验测定模型参数优化研究 [J]. | 粘接 , 2023 , 50 (7) : 59-63 . |
| MLA | 王建华 et al. "基于橡胶沥青粘弹试验测定模型参数优化研究" . | 粘接 50 . 7 (2023) : 59-63 . |
| APA | 王建华 , 赖益梁 , 袁燕 , 刘建新 , 杨枫 . 基于橡胶沥青粘弹试验测定模型参数优化研究 . | 粘接 , 2023 , 50 (7) , 59-63 . |
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