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学者姓名：徐松
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Abstract ：
SBS modified asphalt (SBSMA) pavements have gained popularity worldwide due to their prominent performance. However, its maintenance and reconstruction projects will produce a large amount of reclaimed asphalt pavement (RAP) during the long-term service of asphalt pavement. Adding rejuvenators products is a common method to recycling RAP. However, conventional rejuvenators are typical component regulators applicable to recycling unmodified asphalt, while there is a poor regeneration effect for the aged SBS modified asphalt (ASBSMA), because it cannot repair the degraded SBS polymer. Fortunately, reactive rejuvenator (RR) has achieved this breakthrough based on the research findings in recent years. It contains special compounds that have the ability to repair the degraded SBS. The vital questions to be investigated in the present review are how the four current systems of RR (epoxy system, isocyanate system, compound system and polymer system) affect ASBSMA's properties and how well does its regeneration effect. Existing research indicated that RRs are favorable for the regeneration of A-SBSMA and have their respective characteristics. This review summaries various RR different regeneration mechanism, and analyzed its effects on physical properties, rheological properties, high and low temperature properties, and microscopic characteristics of A-SBSMA. Although research on RR is still in its infancy with a limited number of relevant studies, they show an excellent regeneration effect for A-SBSMA and hold a promising prospect. Overall, this review provides information on the feasibility of using RR as a sustainable SBSMA rejuvenator to promote conserving resources and reusing RAP.
Keyword ：
Microscopic characteristics Microscopic characteristics Physical properties Physical properties Reactive rejuvenator Reactive rejuvenator Re-crosslinking SBS polymer Re-crosslinking SBS polymer Regeneration mechanism Regeneration mechanism Rheological properties Rheological properties SBS modified asphalt SBS modified asphalt
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| GB/T 7714 | Xu, Song , Tang, Guangming , Pan, Shilong et al. Application of reactive rejuvenator in aged SBS modified asphalt regeneration: A review [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 421 . |
| MLA | Xu, Song et al. "Application of reactive rejuvenator in aged SBS modified asphalt regeneration: A review" . | CONSTRUCTION AND BUILDING MATERIALS 421 (2024) . |
| APA | Xu, Song , Tang, Guangming , Pan, Shilong , Ji, Zhiyuan , Fang, Lei , Zhang, Canlin et al. Application of reactive rejuvenator in aged SBS modified asphalt regeneration: A review . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 421 . |
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Using the dynamic mechanical thermal analysis (DMTA) method, the frequency dependence of dynamic mechanical properties of cement asphalt (CA) binders were examined within the testing frequency range between 0.1 and 100 Hz in this study. Based on the time-temperature superposition (TTS) principle, the master curves of storage modulus (E '), loss modulus (E ''), and loss factor (tan delta) of CA binders within a wide frequency range from 1 x 10-5 to 1 x 1010 Hz were obtained. The results showed that the E ', E '', and tan delta of CA binders were highly sensitive to the frequency due to the incorporation of asphalt. The value of E ' rose as the frequency increased, whereas E '' and tan delta showed different trends as the frequency increased. Storage modulus rising factor Delta E ' and peak value of loss factor tan delta max could be used to characterized the frequency dependence of dynamic mechanical properties. A simple solid model with fractional derivation was established to characterize the dynamic viscoelastic behavior of CA binders and was in excellent agreement with experiment data over both testing and a wide range of frequency. Correlations were observed between model parameters and asphalt content of CA binders. Our results contribute to the current field by providing the evidence for the dynamic mechanical properties estimation of CA mortar under various loading frequency.
Keyword ：
Cement asphalt (CA) binders Cement asphalt (CA) binders Constitutive model Constitutive model Dynamic mechanical thermal analysis (DMTA) method Dynamic mechanical thermal analysis (DMTA) method Loss factor Loss factor Storage modulus Storage modulus
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| GB/T 7714 | Fang, Lei , Huang, Jianghuai , Chen, Zhen et al. Frequency Dependency and Constitutive Model of Dynamical Mechanical Properties of Cement Asphalt Binders [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (6) . |
| MLA | Fang, Lei et al. "Frequency Dependency and Constitutive Model of Dynamical Mechanical Properties of Cement Asphalt Binders" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 36 . 6 (2024) . |
| APA | Fang, Lei , Huang, Jianghuai , Chen, Zhen , Zhang, Bisheng , Xu, Song , Lu, Jiacheng . Frequency Dependency and Constitutive Model of Dynamical Mechanical Properties of Cement Asphalt Binders . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (6) . |
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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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Abstract ：
Red clay exhibits characteristics such as softening owing to water absorption and cracking because of water loss, which can lead to slope instability, road cracking, and compromised structural integrity when used directly in roadbed filling. Although the addition of industrial materials such as cement is a common engineering treatment, it severely impairs soil renewability. Lignosulfonate (LS) extracted from paper plant waste fluids is a natural bio-based polymer with promising applications as a soil improver. In this study, the boundary moisture content and mechanical properties of LS-treated red clay were investigated using Atterberg, unconfined compressive strength, and direct shear strength tests. Additionally, the LS-treated red clay modification mechanism was explored at multiple scales using zeta potential analysis, X-ray diffraction, scanning electron microscopy coupled with energy dispersive spectroscopy, and Fourier transform infrared spectroscopy. The results indicated that the LS dosage significantly affected both the water content and mechanical strength of the red clay boundaries. The optimal dosage of LS for red clay was 3 wt. %, at which the liquid limit was reduced by 32.97%, the plastic limit by 19.33%, and the plasticity index by 48.37%. The 28-day compressive strength of LS-treated red clay was increased by 378.4%, and the direct shear strength was increased by 136%. Analysis of the microstructure and mineral composition revealed that the LS-treated red clay did not form new minerals, but primarily filled pores and connected soil particles. Through the combined effects of hydrogen bonds, electrostatic interactions, and cation exchange, the LS-treated red clay reduced the size of the mineral particles and the thickness of the mineral double electric layer, resulting in increased structural densification. These results are of great scientific significance for the ecological modification of soils.
Keyword ：
Boundary moisture content Boundary moisture content Lignosulfonate Lignosulfonate Mechanical property Mechanical property Microstructure Microstructure Modification mechanism Modification mechanism Red clay Red clay
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| GB/T 7714 | Ma, Hongyan , Pei, Chenglin , Li, Sihan et al. Performance Evaluation and Modification Mechanism of Red Clay Treated with Lignosulfonate [J]. | INTERNATIONAL JOURNAL OF CIVIL ENGINEERING , 2024 , 22 (11) : 1961-1976 . |
| MLA | Ma, Hongyan et al. "Performance Evaluation and Modification Mechanism of Red Clay Treated with Lignosulfonate" . | INTERNATIONAL JOURNAL OF CIVIL ENGINEERING 22 . 11 (2024) : 1961-1976 . |
| APA | Ma, Hongyan , Pei, Chenglin , Li, Sihan , Xu, Song . Performance Evaluation and Modification Mechanism of Red Clay Treated with Lignosulfonate . | INTERNATIONAL JOURNAL OF CIVIL ENGINEERING , 2024 , 22 (11) , 1961-1976 . |
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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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Red clay is a special soil that loses water and shrinks easily, which causes expansion and contraction and leads to the generation and development of cracks, weakening the strength and engineering properties of the soil. This investigation analyzed the mechanism of crack evolution and patterns of strength decay in red clay under dry-wet cycles and established a relationship between strength and crack ratio by employing image processing techniques and conducting direct shear tests on red clay with various initial moisture contents and humidification times. The results show that the crack ratio increases with the number of dry-wet cycles and eventually tends to be stable after the fourth dry-wet cycle, and the stress-displacement curve of red clay changes from weak hardening to hardening. With the progress of the dry and wet cycles, the shear strength indexes of red clay decrease extensively, displaying a negative association with the sample's initial moisture content and the duration of humidification. Based on the experimental result, a quadratic function was established to model the relationship between soil cracking ratio and shear strength, which can predict the shear strength of red clay from the cracking ratio.
Keyword ：
Crack Crack Dry-wet cycle Dry-wet cycle Image processing technology Image processing technology Red clay Red clay Shear strength Shear strength
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| GB/T 7714 | Ma, Hongyan , Pei, Chenglin , Huang, Renjie et al. Crack Evolution and Strength Attenuation of Red Clay under Dry-Wet Cycles [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (4) . |
| MLA | Ma, Hongyan et al. "Crack Evolution and Strength Attenuation of Red Clay under Dry-Wet Cycles" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 36 . 4 (2024) . |
| APA | Ma, Hongyan , Pei, Chenglin , Huang, Renjie , Xu, Song . Crack Evolution and Strength Attenuation of Red Clay under Dry-Wet Cycles . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (4) . |
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To promote the anti-ageing performance of asphalt, layered double hydroxides (LDHs) modified by propyl trimethoxylsilane (MPMS) was prepared and applied to modify asphalt. Fourier transform infrared spectroscopy (FTIR) showed that MPMS was chemically-grafted on the surface of LDHs. The interaction between LDHs and asphalt was significantly enhanced after MPMS organic modification, and MPMS organic LDHs (OMLDHs) exhibited better compatibility in asphalt. OMLDHs and LDHs could enhance the high-temperature properties of asphalt, particularly OMLDHs. After ageing, the properties and structure of asphalt were dramatically degenerated. The incorporation of LDHs could inhibit the oxygenic groups increase in asphalt molecules during ageing, and retard the gelatinization of colloidal structures. LDHs could alleviate the negative effect of ageing on asphalt, and improve the anti-ageing performance of asphalt. The improvement effectiveness of LDHs on the anti-ageing performance of asphalt was remarkably improved after MPMS modification.
Keyword ：
Anti-ageing performance Anti-ageing performance Asphalt Asphalt Chemical components Chemical components Chemical structure Chemical structure Layered double hydroxides Layered double hydroxides Molecular dynamics simulation Molecular dynamics simulation Rheological properties Rheological properties Surface organic modification Surface organic modification
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| GB/T 7714 | Zhang, Canlin , Chen, Minxuan , Wang, Ting et al. Evaluation of surface organic layered double hydroxides on the anti-ageing performance of asphalt [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 413 . |
| MLA | Zhang, Canlin et al. "Evaluation of surface organic layered double hydroxides on the anti-ageing performance of asphalt" . | CONSTRUCTION AND BUILDING MATERIALS 413 (2024) . |
| APA | Zhang, Canlin , Chen, Minxuan , Wang, Ting , Xu, Song , Li, Yifei , Que, Yun et al. Evaluation of surface organic layered double hydroxides on the anti-ageing performance of asphalt . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 413 . |
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Abstract ：
SBS modified asphalt is an important material to improve the quality of high-grade pavements and airport runways, it will deteriorate during the service life due to a combination of environmental factors leading to pavement disease which triggers the maintenance and reconstruction. In this process, an amount of reclaimed asphalt pavement (RAP) will be produced. For environment protection and resource reservation, RAP is usually regenerated by a rejuvenator. In this paper, reactive rejuvenators were prepared by epoxy compounds for regenerating aged SBS modified asphalt (A-SBSMA), and the changes in physical properties, rheological properties, chemical structure, and microscopic morphology of the regeneration of A-SBSMA before and after were investigated to evaluate the regeneration effect. Compared with traditional rejuvenators, the significant effect of reactive rejuvenators on the recovery of physical properties and rheological properties of A-SBSMA. By FTIR and microscopic morphology analysis, reactive rejuvenator can better recover the functional group species, broken SBS molecular structure, and network structure of A-SBSMA. © 2023 ASCE.
Keyword ：
Asphalt Asphalt Morphology Morphology Physical properties Physical properties Rheology Rheology Structural properties Structural properties
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| GB/T 7714 | Xu, Song , Tang, Guangming , Zhou, Jihong et al. Regeneration Effects of Epoxy Compounds on Aged SBS Modified Asphalt [C] . 2024 : 144-154 . |
| MLA | Xu, Song et al. "Regeneration Effects of Epoxy Compounds on Aged SBS Modified Asphalt" . (2024) : 144-154 . |
| APA | Xu, Song , Tang, Guangming , Zhou, Jihong , Cao, Zhilong , Luo, Yuyang , Jia, Xiaojuan . Regeneration Effects of Epoxy Compounds on Aged SBS Modified Asphalt . (2024) : 144-154 . |
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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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The thermal-oxidative aging of asphalt is extensively researched in recent years. However, the aging behavior of asphalt in salt and water environment receives less attention. A virgin asphalt binder was treated by various coupling conditions of salt and water in this work aiming at understanding the aging behaviors, and then the physical indexes, rheological parameters, chemical structures, four fractions and contact angles of asphalt before and after aging were measured to evaluated the effects of different aging environments on the physicochemical properties of asphalt. Results indicate that the aged asphalt has higher softening point and complex modulus while lower penetration and phase angle in comparison with unaged asphalt, implying the asphalt becomes harder and more brittle after aging. Although asphalt aged in salt and water conditions exhibits similar changes in macro-properties to thermal-oxidative aged asphalt, the analysis of chemical composition indicates that the aging of asphalt under salt and water environment is caused by unique inducements, which can be divided into two parts, that is, separating out of aromatics and saturates from asphalt by combined action of salt out and emulsification, and increasing of asphaltenes and resins caused by oxidation. These two factors work together leading to the change of colloidal structure and finally cause the deteriorate of macro-properties. Besides, the results of contact angle test indicate the increasing polar functional groups resulting from aging enhance hydrophily of asphalt and increase the possibility of water to enter the interior of asphalt, exacerbating the performance degradation of asphalt.
Keyword ：
Aging evaluation Aging evaluation Asphalt Asphalt Colloidal structure Colloidal structure Polar functional groups Polar functional groups Salt-water coupling effect Salt-water coupling effect
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| GB/T 7714 | Xu, Song , Cai, Shaoxu , Huang, Runyu et al. Investigation of aging behaviors of asphalt under the coupling conditions of salt and water [J]. | FUEL , 2024 , 365 . |
| MLA | Xu, Song et al. "Investigation of aging behaviors of asphalt under the coupling conditions of salt and water" . | FUEL 365 (2024) . |
| APA | Xu, Song , Cai, Shaoxu , Huang, Runyu , Xu, Kangyi , Ma, Zirong , Fang, Lei et al. Investigation of aging behaviors of asphalt under the coupling conditions of salt and water . | FUEL , 2024 , 365 . |
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