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学者姓名：章灿林
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Abstract ：
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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2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (ultraviolet absorbent, BP) intercalated layered double hydroxide (LDH) was synthesized to enhance the anti-ageing properties of styrene-butadiene-styrene block copolymer (SBS) modified bitumen (SMB). X-ray diffraction and UV-vis spectroscopy indicated that BP has been successfully substituted into LDH interlamination, and BP intercalated LDH (BP-LDH) exhibited better UV absorptive capacity than LDH. Then, the physical and rheological properties, chemical structure of BP-LDH and LDH modified SMB before and after ageing were comprehensively studied. Compared with LDH, BP-LDH possessed the smaller difference in solubility parameters (delta) and the stronger interaction energy (Einter) with SMB, resulting in the better compatibility of BP-LDH modified SMB. The high-temperature stability of SMB was promoted with the addition of BP-LDH or LDH, especially BP-LDH. After ageing, the temperature susceptibility, low-temperature anti-cracking and anti-fatigue cracking of SMB were deteriorated, the oxygen-containing groups (C = O and S = O) in SMB noticeably increased and carbon-carbon double bond (C = C) concurrently decreased. LDH could mitigate the ruin of ageing on the performance and chemical structures of SMB, and strengthen the anti-ageing performance. Furthermore, BP intercalated modification could further significantly heighten the performance of LDH.
Keyword ：
Anti-ageing ability Anti-ageing ability Compatibility Compatibility Layered double hydroxide Layered double hydroxide Molecular dynamics simulation Molecular dynamics simulation Rheological properties Rheological properties SBS modified bitumen SBS modified bitumen
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| GB/T 7714 | Wang, Ting , Wu, Jiangxin , Zhang, Canlin et al. Styrene-butadiene-styrene block copolymer modified bitumen with ultraviolet absorbent intercalated layered double hydroxide: Compatibility and anti-ageing properties [J]. | JOURNAL OF MOLECULAR LIQUIDS , 2024 , 410 . |
| MLA | Wang, Ting et al. "Styrene-butadiene-styrene block copolymer modified bitumen with ultraviolet absorbent intercalated layered double hydroxide: Compatibility and anti-ageing properties" . | JOURNAL OF MOLECULAR LIQUIDS 410 (2024) . |
| APA | Wang, Ting , Wu, Jiangxin , Zhang, Canlin , Yang, Shuai , Dong, Hongjun , Hu, Shikai et al. Styrene-butadiene-styrene block copolymer modified bitumen with ultraviolet absorbent intercalated layered double hydroxide: Compatibility and anti-ageing properties . | JOURNAL OF MOLECULAR LIQUIDS , 2024 , 410 . |
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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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为了增强SBS改性沥青(SMB)的抗老化性能,利用层状双金属氢氧化物(LDHs)的独特结构对SMB进行改性.研究了LDHs对SMB的物理性能、高低温流变性能和化学结构的影响规律.研究结果表明:LDHs的加入有助于提高SMB的弹性性能,提升SMB的高温稳定性能;老化后,沥青分子发生氧化反应导致SMB中含氧官能团(S=O和C=O)含量增加,同时SBS分子链发生断裂引起SMB中碳碳双键官能团(C=C)含量减少,这些变化使SMB的物理性能、高温抗车辙性能和低温抗疲劳开裂性能发生劣化,导致其变硬变脆;LDHs的加入可以阻止沥青分子的氧化反应和SBS分子链断裂,减缓沥青分子的老化和SBS老化降解,减轻老化对SMB物理性能和高低温流变性能的破坏,增强SMB的抗老化能力,为建设长寿命的SMB路面提供技术支持.
Keyword ：
SBS改性沥青(SMB) SBS改性沥青(SMB) 化学结构 化学结构 层状双金属氢氧化物(LDHs) 层状双金属氢氧化物(LDHs) 抗老化能力 抗老化能力 流变性能 流变性能 物理性能 物理性能
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| GB/T 7714 | 汪婷 , 谈振华 , 章灿林 . 层状双金属氢氧化物(LDHs)对SBS改性沥青抗老化性能的影响研究 [J]. | 市政技术 , 2024 , 42 (10) : 200-206 . |
| MLA | 汪婷 et al. "层状双金属氢氧化物(LDHs)对SBS改性沥青抗老化性能的影响研究" . | 市政技术 42 . 10 (2024) : 200-206 . |
| APA | 汪婷 , 谈振华 , 章灿林 . 层状双金属氢氧化物(LDHs)对SBS改性沥青抗老化性能的影响研究 . | 市政技术 , 2024 , 42 (10) , 200-206 . |
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Assessing the seismic capacity of pier columns is a crucial element in the performance -based seismic design of bridges. Such assessment necessitates a probabilistic approach to accurately determine the marginal probability distributions of seismic capacities and to characterize the dependencies among these variables. In response to this need, this paper employs Multi -Output Gaussian Process Regression (MO-GPR), a probabilistic machine learning method, to jointly model the multiple seismic capacities of pier columns. We initially introduce a probabilistic seismic capacity model that utilizes MO-GPR for pier columns and validate its predictive accuracy in comparison to Bayesian linear regression and existing empirical methods. Subsequently, the methodology is augmented by the integration of hierarchical modeling within the MO-GPR framework, resulting in a Multi -Output Hierarchical Gaussian Process Regression (MO-HGPR) model that effectively estimates intraclass correlation coefficients for specific types of datasets. It is postulated that these correlation coefficients also reflect correlations associated with multiple components of the real structure. This study employs MO-HGPR and MO-GPR separately to investigate the potential correlations of seismic capacities among pier columns and distinct limit states. The results demonstrate that the MO-GPR model exhibits superior prediction accuracy and more effectively portrays uncertainty compared to existing empirical models. Moreover, the correlations of seismic capacities among piers and limit states are both robust and significantly impact the seismic fragility of bridges. This finding highlights the essential nature of considering capacities correlations in seismic fragility or risk assessment processes.
Keyword ：
Damage limit states Damage limit states Gaussian process regression Gaussian process regression Hierarchical model Hierarchical model Pier columns Pier columns Seismic capacity correlation Seismic capacity correlation Seismic fragility Seismic fragility
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| GB/T 7714 | Mo, Ruchun , Chen, Libo , Chen, Yu et al. Prediction and correlations estimation of seismic capacities of pier columns: Extended Gaussian process regression models [J]. | STRUCTURAL SAFETY , 2024 , 109 . |
| MLA | Mo, Ruchun et al. "Prediction and correlations estimation of seismic capacities of pier columns: Extended Gaussian process regression models" . | STRUCTURAL SAFETY 109 (2024) . |
| APA | Mo, Ruchun , Chen, Libo , Chen, Yu , Xiong, Chuanxiang , Zhang, Canlin , Chen, Zhaowu et al. Prediction and correlations estimation of seismic capacities of pier columns: Extended Gaussian process regression models . | STRUCTURAL SAFETY , 2024 , 109 . |
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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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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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