CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Mei Deng,Wenli Zhang,Xinli Gan,Xuejuan Cao,Boming Tang,Xinqiang Zhang
Asphaltene aggregates depolymerization is a critical factor in aged asphalt rejuvenation, yet the impact of major rejuvenator components remains unclear due to asphaltenes’ complex structure. Unlike previous simulation-based investigations, this study employs various characterization techniques to reveal asphaltene aggregate behaver during oxidative aging and the microscopic depolymerization mechanism and structure-activity relationships of 10 representative bio-based and petroleum-based rejuvenator compounds. The results revealed that oxidative aging increased the stacking density and order of aromatic layers within asphaltene aggregates and promoted O-H···O hydrogen bond formation. Additionally, oxidation reduced the critical micelle concentration of asphaltenes and caused fluorescence quenching, resulting in the development of dendritic three-dimensional aggregates with equidistant, layered, and porous structures. However, the introduction of rejuvenators disrupted the stacking of aromatic layers but had minimal impact on the arrangement of aliphatic chains. Rejuvenators containing heteroatoms further promoted depolymerization by forming hydrogen bonds with asphaltene molecules, reducing the aggregate size and producing more dispersed and irregular structures. The bio-rejuvenators with heteroatom functional groups exhibited superior depolymerization efficiency. This study provides mechanistic insights into rejuvenator-induced asphaltene depolymerization and establishing a foundational reference for the molecular design of efficient rejuvenators in recycled asphalt applications.
研究领域:
土木工程
·
材料科学
·
化学工程
·
高分子科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Mei Deng,Xuejuan Cao,Yin Yuan,Xiaoyu Yang,Boming Tang,Xiaoyan Li
In this work, a high quantum level of density functional theory (DFT-D) approach and fourier transform infrared spectrum (FTIR) at a micro-level were used to understand one phenomenon: the specific molecular mechanisms responsible for the deagglomeration effect of 10 kinds of representative molecules of bio- and petroleum-based rejuvenators on asphaltene aggregations found in the aged asphalt. The DFT results indicated that the action site of rejuvenators in sulfoxide group (S = O) position was bound stronger than those in carbonyl (C = O) and pyridine nitrogen. Compared with petroleum-based rejuvenators, bio-rejuvenators were responsible for significant contribution to the deagglomeration process when they were adequately inserted into the oxidized asphaltene dimer. Especially, 2-methoxyphenol (phenolic compounds) showed significantly higher efficiency than either of them. The deagglomeration behavior was mainly attributed to a new interaction (hydrogen-bonds of O-H··O/N-H··O and dispersion-attraction) of a series of competing factors between the rejuvenators and the asphaltenes. This polarized the charge distribution throughout the aromatic region of the asphaltene dimer and built up a multi-centered electron density (such as a three-center four-electron H-bond), thus destroying eventual interactions between asphaltene stacks and reducing the extent of clustering of asphaltene units that were intensified during oxidative aging. The FTIR data painted a preliminary picture of the hybrid rejuvenator-asphaltene as aromatic cores with shorter aliphatic side chains and more carbonyl and hydroxyl side groups, and showed the absence of chemical bonding interaction between the rejuvenators and asphaltene nanoclusters.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Wenke Huang,Chongqiu Huang,Zhicheng Xiao,Weilin Deng,Xingbin Zeng,Xu Cai,Kuanghuai Wu
To enhance the oxidation aging resistance of asphalt binder, slow-release porous calcium carbonate (CaCO 3 ) microspheres loaded with asphalt rejuvenator were proposed. The porous calcium carbonate microspheres fabricated by a double decomposition method regulated by polyacrylic acid (PAA) and sodium dodecyl sulfonate (SDS) were used as carriers for the asphalt rejuvenator. The test results showed that the porous CaCO 3 microspheres possessed higher specific surface areas and porosities, and the weight ratio of the rejuvenator loaded on the CaCO 3 microspheres was up to15%. Frequency sweep test results showed that the complex modulus of the asphalt binder added with rejuvenator-loaded CaCO 3 microspheres decreased after aging. When the content of the CaCO 3 microspheres added in asphalt binder reached 70%, the complex modulus is even less than that of neat asphalt. Additionally, the slow-release mechanism of the CaCO 3 microspheres loaded with rejuvenator was studied based on molecular dynamics simulations. The simulation results also showed that the composition and structure of the molecule played an important role in the diffusion ability. This study provides a reference for developing a new method to delay the oxidation aging of asphalt, and it provides theoretical and experimental data support for the design of oxidation-aging resistance asphalt mixtures.
研究领域:
材料科学
·
道路工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiaobin Han,Sanpeng Mao,Shi Xu,Zhilong Cao,Shangheng Zeng,Jianying Yu
Efficient recycling of aged SBS modified bitumen (ASBS-MB) is one of the difficult problems in the field of pavement materials. In this study, isocyanate terminated long chain active rejuvenators (ITLCARs) for aged SBS were synthesized by the reaction of 2,4-toluylene diisocyanate (TDI)/ hexamethylene diisocyanate (HDI) and hydroxyl terminated polybutadiene (HTPB), namely T-HTPB and H-HTPB. And T-HTPB/H-HTPB and aromatic hydrocarbon oil (AO) were combined to form novel composite rejuvenators (NCRs), which were used to restore the properties of ASBS-MB. Afterwards, the effects of NCRs on physical properties, rheological properties and molecular weight distribution of ASBS-MB were investigated. FTIR results showed that ITLCARs were successfully synthesized. The results of gel permeation chromatography showed that NCRs had advantages in restoring the molecular weight of ASBS-MB to the level of SBS-MB. And the physical performances of ASBS-MB could be regenerated to the level of original SBS modified bitumen (SBS-MB) by NCRs. The high-temperature complex modulus and rutting factor of rejuvenated SBS modified bitumen (RSBS-MB) recovered by NCRs were better than those restored only by AO. Meanwhile, the low-temperature complex modulus and fatigue factor of RSBS-MB recovered by NCRs still had greater low-temperature properties. And the results of bending beam rheometer test indicated that creep stiffness and m-value of RSBS-MB at −12 ℃ and −18 ℃ meet the requirements of Strategic Highway Research Program. This study provides a novel rejuvenation method for the efficient recycling of ASBS-MB.
研究领域:
材料科学
·
道路工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Xiaobin Han,Xirong Niu,Zhuang Zhang,Zhilong Cao,Ruiyang Wang,Zhengang Feng,Jianying Yu
Active flexible rejuvenators achieved high-quality regeneration of aged SBS modified bitumen (SMB) by reconstructing the aged SBS cross-linked structure while also an incorporating bitumen component reducing agent (aromatic oil, AO). However, the impact of active flexible rejuvenators with different molecular structures on the ultraviolet (UV) radiation durability of regenerated SBS-modified bitumen remains unclear, making it impossible to evaluate the long-term effectiveness of these rejuvenators. In this study, aged SMB was subjected to composite regeneration using active flexible rejuvenators with different molecular structures and AO. Subsequently, the regenerated SMB was subjected to UV aging. By comparing it with SMB regenerated with only AO, the influence of active flexible rejuvenators with different molecular structures on the UV aging properties of the regenerated SMB was investigated. FTIR results revealed that the SBS cross-linked structure, which had been reconstructed by the active flexible rejuvenators, underwent continued degradation and breakage during UV aging. This process consumed UV radiation energy and oxygen, thereby partly inhibiting the oxidative condensation of the regenerated bitumen. The SARA fractions analysis indicated that active flexible rejuvenators could slow down the volatilization of light components and their rate of oxidative condensation during UV aging by reconstructing the aged SBS cross-linked structure. The incorporation of active flexible rejuvenators mitigated the deterioration of the physical and rheological properties of the regenerated SMB subjected to UV radiation. When utilized in comparison to solely employing bitumen component reducing agents, active flexible rejuvenators were capable of bolstering the aging resistance of SMB that had underwent regeneration by reconstructing the cross-linked structures of aged SBS. The effectiveness of active flexible rejuvenators in enhancing the aging resistance of SMB during regeneration varies, owing to their differing sensitivities to ultraviolet radiation based on their molecular structures. This study offered data support for optimizing the molecular structure of active flexible rejuvenators.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2017
·
IF 3.169
Xiong Xu,Jianying Yu,Canlin Zhang,Zhilong Cao,Yi Gu,Lihui Xue
This paper mainly investigates the effect of the reactive rejuvenator diphenyl methane diisocyanate (MDI) and 1,4-butanediol diglycidyl ether (BUDGE) on chemical structures of aged SBS and rejuvenated structures, rejuvenation mechanisms, physical and rheological properties of UV-aged SBS modified bitumen (SMB). Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) show the hydroxyl and carbonyl groups have formed on aged SBS, which indicates that the broken-chain structures of SBS have formed after UV radiation. Meanwhile, the disappeared hydroxyl groups and formed amide bond in FTIR spectrum of MDI rejuvenated SBS, and the associated hydroxyl groups and another appeared carbonyl groups in FTIR spectrum of BUDGE rejuvenated SBS indicate MDI and BUDGE can act as a “bridge” to connect the broken-chain SBS together at 150 °C. Moreover, the performance results show rejuvenation temperature and time have little impact on the physical properties of rejuvenated SMB whatever the rejuvenator is selected. With the increasing content of MDI, the softening point of rejuvenated SMB can be improved and the ductility at low temperature remains almost unchanged. However, the softening point of rejuvenated SMB decreases and the ductility increases as the rising content of BUDGE. Phase angle results indicate MDI can further increase the elasticity of aged SMB, and BUDGE can to some extent restore the viscosity characteristic. From the results of fatigue and rutting performance, 1% BUDGE weakens the fatigue limit temperature of aged SMB from 20.1 °C to 14.9 °C and 1% MDI increases the rutting limit temperature from 79.6 °C to at least 80 °C, which indicates BUDGE and MDI can respectively help improve the fatigue resistance and rutting resistance. Based on the analysis of FTIR spectra and the relative functional group indexes, the results show the increasing concentration of I NH CO in MDI rejuvenated SMB and I C O C in BUDGE rejuvenated SMB, indicating the chemical reaction between reactive rejuvenators and aged SMB can be occurred. The rejuvenation of aged SMB with MDI or BUDGE abides by the addition reaction mechanism or condensation reaction mechanism.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 7
·825
·
IF 2.9
Xin Jin,Haoxuan Fu,Deli Li,Ye Yang,Yanhai Yang,Yanfeng Li,Fengchi Wang,Jiupeng Zhang
To determine the formula for biomimetic warm-mix regeneration and fulfill the requirements of a “high waste asphalt mixture content, high quality, and high level” for its usage in reclaimed asphalt pavement (RAP), this paper first determined the suitable preparation process and formula for biomimetic warm-mix regeneration based on orthogonal experiments and a gray correlation analysis. Then, the optimum dosage of the warm-mix regenerant was determined by a uniaxial penetration test, low-temperature splitting test, and freeze–thaw penetration test. The rutting test was conducted to characterize the high-temperature performance of the asphalt mixture. The Immersion Marshall Test and the freeze–thaw splitting test were used to characterize the water stability of the recycled asphalt mixture. The low-temperature small beam test was employed to study the low-temperature performance of the recycled asphalt mixture. The asphalt’s short-term and long-term aging processes were simulated using the rotary thin-film oven test (RTFOT) and the pressure aging test (PAV). The action mechanism of biomimetic warm-mix regeneration was revealed by Fourier-transform infrared spectroscopy (FTIR). Finally, a comprehensive thermal performance test was conducted on the aged asphalt after biomimetic warm-mix regeneration. The results showed that the self-made biomimetic warm-mix regeneration agent exhibited an excellent regenerative effect on RAP and significantly reduced the mixing temperature of the styrene–butadiene–styrene (SBS)-modified asphalt mixture. In addition, the self-made biomimetic warm-mix regeneration agent effectively improved the high- and low-temperature performance of the recycled asphalt mixture, but had no noticeable effect on the water stability. The suggested dosage of the biomimetic warm-mix regeneration agent was 6%, and the mixing temperature was 130 °C. The microscopic chemical analysis revealed that biomimetic warm-mix regeneration restored the performance of aged asphalt by supplementing the light component. The change rules of the chemical functional groups and the comprehensive thermal properties of the recycled mixture showed a good correlation with the change rules of its high- and low-temperature performance.
研究领域:
道路工程
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Xiaobin Han,Xirong Niu,Zhuang Zhang,Song Xu,Xinxing Zhou,Zhilong Cao,Zhengang Feng,Jianying Yu
This study aimed to improve the rejuvenation quality of aged styrene-butadiene-styrene (SBS) modified bitumen mixture (PmBM) by employing composite rejuvenation through the synergistic application of various active-flexible rejuvenators (AFRs) featuring distinct molecular structures with aromatic oil (AO). By comparing with the mixture rejuvenated solely by AO, the impact of different AFRs on the pavement performance of aged PmBM as well as its aging resistance after rejuvenation was explored. The results demonstrated that, in comparison to the mixture rejuvenated solely by AO, the incorporation of AFRs considerably enhanced the high-temperature deformation resistance, low-temperature crack resistance, fatigue durability, and water damage resistance of the rejuvenated PmBM. And these properties were restored to levels close to or even surpassing those of fresh mixtures. Compared with sole AO application, AFRs demonstrated superior performance by effectively restoring the cross-linking structures of degraded SBS within the bitumen, while concurrently enhancing interfacial adhesion between the rejuvenated bitumen binders and the granite aggregates. These synergistic effects considerably improved the structural integrity of rejuvenated PmBMs. Moreover, the results of the thermal aging showed that the deterioration degree in pavement performance after aging was considerably lower for the (AFRs+AO) rejuvenated PmBMs compared to those rejuvenated solely with AO. The possible reason is that AFRs enhances the thermal aging resistance of the rejuvenated PmB by reconstructing the cross-linking structure of degraded SBS within the bitumen. The study reveals that during the rejuvenation process of aged PmBMs, it is particularly crucial to prioritize and effectively restore the cross-linking structures of degraded SBS within them. Additionally, when optimizing the molecular structure of AFRs in subsequent study, it is imperative to consider the sensitivity of the molecular structure of AFRs to aging factors, so as to ensure the durability of the rejuvenated PmBMs.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Xiaobin Han,Jianying Yu,Xiaoqiao Huang,Zhilong Cao,Ruiyang Wang,Peng He
In order to better restore the properties of aged SBS modified bitumen (ASMB) and promote its sustainable recycling, in this paper, the reactive chain extension rejuvenators (RCERs) were prepared from polyethylene glycol (PEG-400/PEG-1000) and diisocyanate (2,4-toluylene diisocyanate (TDI)/hexamethylene diisocyanate (HDI)) and the effect of RCERs on the rejuvenation of aged SBS was studied. Different rejuvenation systems composed by TDI, HDI, RCERs and aromatic hydrocarbon oil (AHO) were constructed, and the influence of rejuvenation systems ((TDI + AHO), (HDI + AHO) and (RCERs + AHO)) on the physical properties of ASMB were investigated. Fourier transform infrared spectra demonstrated that the RCERs were successfully synthesized. Gel permeation chromatography indicated that the number average molecular weight range of RCERs was 550–1150 and the molecular weight of SBS rejuvenated by RCERs was larger than that of SBS rejuvenated by TDI and HDI. Thermogravimetry-differential thermal analysis manifested that the thermal stability of SBS rejuvenated by RCERs were enhanced evidently compared with that of TDI and HDI. The physical properties of ASMB could be fully recovered by the rejuvenation systems, and the ‘RCERs +AHO’ had better rejuvenation effect on ASMB than that of ‘TDI + AHO’ and ‘HDI + AHO’.
研究领域:
材料科学
·
化学工程
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2018
·
IF 3.485
Xiong Xu,Jianying Yu,Lihui Xue,Bianyang He,Wei Du,Huang Zhang,Ying Li
The excellent comprehensive performance of SBS modified bitumen (SMB), during a long-term thermo- and photo-oxidative exposure, will fail to satisfy the pavement requirement. In this paper, the synergistic effect of 4,4′-diphenylmethane diisocyanate (MDI) and 1,4-butanediol diglycidyl ether (BUDGE) on the molecular weight of aged SBS was firstly studied, through a simulation, to confirm whether a new polymer structure can be obtained. Then, the reactive rejuvenating system containing MDI, BUDGE and bituminous composition returning agent (MDI-BUDGEs) was applied in the rejuvenation of aged SMB. The results show that the rebuilt molecular structure of aged SBS can be obtained with the combination of MDI and BUDGE. Meanwhile, MDI-BUDGEs can improve the low-temperature ductility and inhibit the sharp fall of the softening point of aged SMB, while decrease the viscosity-temperature response at 120–165 °C. Also, MDI-BUDGEs can contribute for increasing the viscous component, improving the fatigue resistance and remaining the high-temperature performance grade of aged SMB, and moreover, decrease the limited elastic modulus and the elastic-plasticity transition rate to avoid the occurrence of the brittle failure within a small strain range.
研究领域:
道路工程材料
·
高分子材料老化与修复
·
沥青化学
·
流变学
·
建筑材料耐久性
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Xiaobin Han,Sanpeng Mao,Shangheng Zeng,Zhilong Cao,Peng He,Wei Du,Jianying Yu
In this study, the novel long-chain active composite rejuvenators (NLCACRs) were composed of long-chain active rejuvenators (LCARs) and aromatic hydrocarbon oil (ArO). Surface free energy method (SFE method), boiling water test method (BWT method) and related parameters were used to evaluate the effect of NLCACRs on interfacial adhesion between aged SBS modified asphalt (ASBS-MA) and granite, and preliminarily predict the moisture sensitivity of asphalt-aggregate system. The results indicated that NLCACRs could increase the surface free energy of ASBS-MA, and the increased range varied with the composition and structure of NLCACRs. The NLCACRs could not only supplement the light components lost by asphalt during aging, but also reconstruct the damaged structure of aged SBS, so they were more effective for the recovery of cohesion work of ASBS-MA. NLCACRs could significantly increase the interfacial adhesion between ASBS-MA and acid granite, and decrease the moisture sensitivity of rejuvenated SBS modified asphalt (RSBS-MA)-granite system. And the results of the BWT method indicated that long-term aging decreased the adhesion grade between SBS modified asphalt and granite from G4 to G2. NLCACRs could restore the adhesion grade of ASBS-MA and granite to the level of original SBS modified asphalt. The comprehensive analysis of the influence of NLCACRs on the interfacial adhesion between ASBS-MA and aggregate showed that the theoretical law (SFE method) was consistent with that of the actual (BWT method). This study could help to explore the influence of NLCACRs on the moisture stability of aged SBS modified asphalt mixture and provide the theoretical basis for its application in practical engineering.
研究领域:
土木工程
·
材料科学
·
沥青技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Xiaobin Han,Sanpeng Mao,Shi Xu,Jianying Yu,Zhilong Cao,Ruiyang Wang,Peng He,Shangheng Zeng
In this study, the reactive chain extension rejuvenators (RCERs) and aromatic hydrocarbon oil (AHO) were applied to construct the reactive chain extension rejuvenation systems (RCERs-AHO), and the effect of RCERs-AHO on the viscosity–temperature characteristics, rheological properties, and morphology of aged styrene–butadiene–styrene (SBS)-modified bitumen (ASMB) was thoroughly studied. Meanwhile, the rejuvenation effect of RCERs-AHO and TDI/HDI-AHO (toluene-2, 4-diisocyanate/hexamethylene diisocyanate and AHO) on ASMB was compared. The results indicated that the RCERs-AHO were more effective in restoring the viscosity of ASMB compared with TDI/HDI-AHO. The critical temperatures of the rutting factor at G*/sinδ = 1.0 kPa of rejuvenated SBS-modified bitumen (RSMB) regenerated by RCERs-AHO were higher than those of RSMB rejuvenated by TDI/HDI-AHO, revealing that RCERs-AHO could better increase the high-temperature rutting resistance of RSMB. Also, the low-temperature cracking resistance of RSMB was obviously enhanced by RCERs-AHO in comparison with TDI/HDI-AHO. The results of the average recovery rate of RSMB revealed that RCERs-AHO could better enhance the deformation recovery ability of RSMB. In addition, fluorescence morphology images clearly indicated that RCERs-AHO could better reconstruct the cross-linking structures of aged SBS compared with TDI/HDI-AHO. The comprehensive analysis of the research results showed that RCERs-AHO could efficiently restore the performances of ASMB to the level of fresh SBS-modified bitumen, and the rejuvenation ability of RCERs-AHO was more obviously excellent than TDI/HDI-AHO.
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）