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学者姓名：徐松
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Abstract ：
为了揭示聚氨酯胶结料的过早破坏机制,更好地优化配方和施工工艺,通过分析抗拉强度、剪切强度、黏结强度以及断裂伸长率、微观形貌和官能团,对聚氨酯胶结料的破坏机制进行规律总结.结果表明,老化480 h后,水热老化的断裂伸长率是热氧老化下降量的2.44倍,黏结强度和剪切强度的下降比例分别为热氧老化的4.01倍和8.95倍.并且,紫外老化对抗拉强度的削弱作用远大于后固化而增加的强度,其老化速率加快,抗拉强度下降速率也随之加快.此外,在路面施工过程中,应尽量保证水泥路面的含水率低于4%,降雨后干燥24 h左右便可继续施工,工期紧张时可以采用大功率落地式工业电风扇或者红外加热车等降低路面含水率,以确保聚氨酯胶结料的施工质量.
Keyword ：
材料老化 材料老化 破坏分析 破坏分析 紫外老化 紫外老化 聚氨酯胶 聚氨酯胶
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| GB/T 7714 | 徐松 , 王叶飞 , 魏必成 et al. 聚氨酯铺装材料的过早破坏机制研究 [J]. | 湖南大学学报（自然科学版） , 2024 , 51 (9) : 99-110 . |
| MLA | 徐松 et al. "聚氨酯铺装材料的过早破坏机制研究" . | 湖南大学学报（自然科学版） 51 . 9 (2024) : 99-110 . |
| APA | 徐松 , 王叶飞 , 魏必成 , 袁燕 , 阙云 , 林存辉 . 聚氨酯铺装材料的过早破坏机制研究 . | 湖南大学学报（自然科学版） , 2024 , 51 (9) , 99-110 . |
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Asphalt aging causes significant distress to pavements, which risks driving safety and poses unsustainable repair and reconstruction works. Layered double hydroxide (LDH) is a promising anti-aging modifier for asphalt. A unique benefit of LDH is its potential raw material - bischofite, a fruitful by-product of salt lake industries and is often casually discarded. In this work, LDH with laminated structure and high crystallinity was synthesized from industrial waste bischofite, and the silane coupling agent A151 was grafted onto the LDH surface, which remarkably inhibits the adhesion and hydrophilicity of LDH and makes it more compatible with asphalt. Asphalt becomes hard and brittle after aging, and the rheological properties deteriorate considerably. At the micro-level, asphalt aging is manifested by the oxidation of light components to heavy ones, the increase of molecular weight, the accumulation of macromolecules, and the gelation of the colloidal structure. Comparative studies indicate that the LDH synthesized from waste bischofite is able to relieve performance deterioration, component oxidation, molecular polymerization, and structure gelation of asphalt during aging. Furthermore, the A151 surface organic modification can further improve the effect of LDH in bolstering the anti-aging property of asphalt. These favorable results provide a sustainable approach to building durable pavements.
Keyword ：
Anti-aging property Anti-aging property Asphalt Asphalt Industrial waste bischofite Industrial waste bischofite Layered double hydroxide Layered double hydroxide Micro-characterizations Micro-characterizations Surface organic modification Surface organic modification
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| GB/T 7714 | Dong, Hongjun , Zhang, Canlin , Weng, Yiwei et al. A novel application of industrial waste bischofite for the anti-aging property of asphalt: Synthesis of organic layered double hydroxide and performance evaluation [J]. | JOURNAL OF CLEANER PRODUCTION , 2024 , 483 . |
| MLA | Dong, Hongjun et al. "A novel application of industrial waste bischofite for the anti-aging property of asphalt: Synthesis of organic layered double hydroxide and performance evaluation" . | JOURNAL OF CLEANER PRODUCTION 483 (2024) . |
| APA | Dong, Hongjun , Zhang, Canlin , Weng, Yiwei , Wang, Ting , Xu, Song , Ma, Shijie et al. A novel application of industrial waste bischofite for the anti-aging property of asphalt: Synthesis of organic layered double hydroxide and performance evaluation . | JOURNAL OF CLEANER PRODUCTION , 2024 , 483 . |
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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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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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The cinnamic acid intercalated layered double hydroxides (CA-LDHs) were prepared by anion exchange method and analyzed by X-ray diffractometer (XRD) Fourier transform infrared (FTIR) spectrometer, scanning electron microscopy (SEM), contact angle goniometer, ultraviolet and visible (UV-vis) spectroscopy, and thermogravimetric (TG) analysis system. Then, the CA-LDHs were added to styrene-butadiene-styrene (SBS) modified bitumen together with an antioxidant composed of octadecyl-3-(3,5di-tert-butyl-4-hydroxyphenyl)-propionate (1076) and tris(2,4-di-tert-butylphenyl) phosphite (168) at a mass ratio of 1 : 1. The effects of antioxidant/CA-LDHs on the physical and rheological properties and chemical composition and characteristics of SBS-modified bitumen before and after pressurized aging vessel (PAV) and ultraviolet (UV) aging were investigated. The results revealed that CA was successfully intercalated into the interlayer space of LDHs. Meanwhile, the CA-LDHs performed improved hydrophobicity and UV absorption capacity compared with LDHs, resulting in enhanced compatibility of LDHs with SBS-modified bitumen, and then the antiaging properties of SBS-modified bitumen could be further strengthened, especially the anti-UV aging properties. Moreover, the mixture of antioxidants and CA-LDHs could synergistically improve the SBS-modified bitumen's thermal- and photo-oxidative aging resistance.
Keyword ：
Antioxidant Antioxidant Cinnamic acid intercalated layered double hydroxides (CA-LDHs) Cinnamic acid intercalated layered double hydroxides (CA-LDHs) Photo-oxidative aging Photo-oxidative aging Styrene-butadiene-styrene (SBS)-modified bitumen Styrene-butadiene-styrene (SBS)-modified bitumen Thermal-oxidative aging Thermal-oxidative aging
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| GB/T 7714 | Xu, Song , Jia, Xiaojuan , Pan, Shilong et al. Effect of Antioxidant/CA-LDHs on the Properties of SBS-Modified Bitumen [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (3) . |
| MLA | Xu, Song et al. "Effect of Antioxidant/CA-LDHs on the Properties of SBS-Modified Bitumen" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 36 . 3 (2024) . |
| APA | Xu, Song , Jia, Xiaojuan , Pan, Shilong , Ma, Zirong , Fang, Lei , Zhang, Canlin et al. Effect of Antioxidant/CA-LDHs on the Properties of SBS-Modified Bitumen . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (3) . |
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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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Bio-asphalt has a great application prospect in the replacement of petroleum-based asphalt to pave and maintain asphalt pavement. However, the problems of flow-induced crystallization and phase separation caused by flow-induced crystallization had severely restricted its application. This paper describes the progress of research on preparation, property evaluation and phase separation mechanism of bio-asphalt. The advantages and disadvantages of preparation methods of bio-asphalt are states. The fundamental physical and rheological properties of bio-asphalt are investigated, especially for flow-induced crystallization. There exists obvious flow-induced crystallization because bio-asphalt is rich in waxes that crystallize easily. Owing to the existence of excess biochar, bio-asphalt appears phase separation. A brief review of the effect of bio-oil and biochar on asphalt volatile organic compounds (VOCs) is presented. Research find that bio-oil/biochar are not only replenish the light components of asphalt, but also improve the flow-induced crystallization and phase separation of bio-asphalt. There exists synergistic effect of biochar and bio-oil in asphalt modification. Moreover, biochar can improve the durability of bio-oil modified asphalt, but excessive addition of biochar to bio-oil modified asphalt can cause phase separation. Adding an appropriate amount of bio-oil and biochar to asphalt can improve its high-temperature resistance, low-temperature crack resistance, and system compatibility. © 2024 The Authors
Keyword ：
Bio-asphalt Bio-asphalt Biochar Biochar Bio-oil Bio-oil Induced crystallization Induced crystallization Phase separation mechanism Phase separation mechanism Volatile organic compounds Volatile organic compounds
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| GB/T 7714 | Zhou, X. , Zhang, Z. , Wang, H. et al. Review on the properties and mechanisms of asphalt modified with bio-oil and biochar [J]. | Journal of Road Engineering , 2024 , 4 (4) : 421-432 . |
| MLA | Zhou, X. et al. "Review on the properties and mechanisms of asphalt modified with bio-oil and biochar" . | Journal of Road Engineering 4 . 4 (2024) : 421-432 . |
| APA | Zhou, X. , Zhang, Z. , Wang, H. , Chen, M. , Wu, S. , Xu, S. et al. Review on the properties and mechanisms of asphalt modified with bio-oil and biochar . | Journal of Road Engineering , 2024 , 4 (4) , 421-432 . |
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To reveal the premature failure mechanism of polyurethane binder，it is used to optimize the formula and construction process. In this paper,by analyzing tensile strength,shear strength,bond strength,elongation at break,micro-morphology,and functional groups,the failure mechanism of polyurethane binder was summarized. The results showed that after 480 h aging,the elongation at break of hydrothermal aging was 2.44 times that of thermal oxygen aging,and the reduction ratio of bond strength and shear strength were 4.01 times and 8.95 times that of thermal oxygen aging,respectively. Moreover,the weakening effect of ultraviolet aging on tensile strength was much greater than the increase of strength after curing,and its aging rate was accelerated,resulting in an accelerated decrease in tensile strength. In addition,during the pavement construction process,it was necessary to ensure that the moisture content of cement pavement should be less than 4% as much as possible. Construction can continue after drying for about 24 h after rainfall. When the construction period is tight,a high-power floor-standing industrial fan or infrared heating truck can be used to reduce the water content of the road surface so as to ensure the construction quality of the polyurethane binder. © 2024 Hunan University. All rights reserved.
Keyword ：
aging of materials aging of materials failure analysis failure analysis polyurethanes polyurethanes UV aging UV aging
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| GB/T 7714 | Xu, S. , Wang, Y. , Wei, B. et al. Study on Premature Failure Mechanism of Polyurethane Paving Materials; [聚 氨 酯 铺 装 材 料 的 过 早 破 坏 机 制 研 究] [J]. | Journal of Hunan University Natural Sciences , 2024 , 51 (9) : 99-110 . |
| MLA | Xu, S. et al. "Study on Premature Failure Mechanism of Polyurethane Paving Materials; [聚 氨 酯 铺 装 材 料 的 过 早 破 坏 机 制 研 究]" . | Journal of Hunan University Natural Sciences 51 . 9 (2024) : 99-110 . |
| APA | Xu, S. , Wang, Y. , Wei, B. , Yuan, Y. , Que, Y. , Lin, C. . Study on Premature Failure Mechanism of Polyurethane Paving Materials; [聚 氨 酯 铺 装 材 料 的 过 早 破 坏 机 制 研 究] . | Journal of Hunan University Natural Sciences , 2024 , 51 (9) , 99-110 . |
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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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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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