JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Tianwei Zhang,Shanjun Gao,Yanheng He,Shangheng Zeng,Hao Duan,Yuhan Chen,Jianying Yu
Self-healing polymer modified bitumen based on dynamic chemical bonds is a potential approach to improve the durability of bitumen pavement and save fossil energy. Herein, a novel self-healing SBS modified bitumen on the basis of dynamic disulfide bonds and hydrogen bonds was prepared. Firstly, an aliphatic disulfide (A-ALD) with disulfide bonds and hydrogen bonds was synthesized. Then A-ALD/SBS modified bitumen (A-ALD/SMB) was prepared by blending A-ALD and SBS modified bitumen. The chemical structure and microstructure of A-ALD/SMB were evaluated. In addition, the self-healing performance of A-ALD/SMB at the macroscopic scale and the self-healing behavior at the molecular scale were investigated by a combination of fatigue healing test and molecular dynamics (MD) simulation. The chemical structure analysis showed the formation of disulfide bonds and hydrogen bonds in A-ALD, and A-ALD was successfully attached to the C C bonds in SBS. Fluorescent images revealed that a better network structure appeared in A-ALD/SMB and formed a two-phase continuous morphology. The optimal dosage of A-ALD in SBS modified bitumen was 0.6 %. The fatigue healing test results indicated that A-ALD markedly enhanced the self-healing ability of SBS modified bitumen, and prolonging resting time and raising healing temperature can increase the self-healing performance of A-ALD/SMB. When the damage degree, healing temperature, and resting time were 30 %, 30 °C, and 60 min, respectively, the healing rate of A-ALD/SMB was 98.5 %, which was 30.2 % higher than SMB. The MD simulation results showed that the A-ALD enhanced the molecular diffusion capacity of SBS modified bitumen, and crack healing time of A-ALD/SMB was earlier than that of SMB under the same conditions. When the healing temperature was 40 °C, the time for the A-ALD/SMB and SMB molecular chain segments to start contacting and healing was 27 ps and 49 ps, respectively, which was improved by 44.9 % for A-ALD/SMB compared to SMB. Furthermore, the self-healing behavior of A-ALD/SMB at the molecular scale was consistent with the self-healing performance at the macroscopic scale under different healing temperatures and damage degrees. This study provided a theoretical basis for exploring the self-healing mechanism of SBS modified bitumen.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yanheng He,Jiheng Jiang,Tao Zhang,Xiaobin Han,Quantao Liu,Tianwei Zhang,Hao Duan,Zhenyu Zou,Zizhou Shen,Jianying Yu,Shi Xu
The development of styrene-butadiene-styrene (SBS) block copolymer modified bitumen (SMB) waterproofing membrane with excellent anti-aging and crack self-healing properties is important to solve the persistent problems of building leakage. In this study, vinyltriethoxysilane modified montmorillonite (VTES-MMT) and acylhydrazone compound (AC) were synthesized and used to prepare a novel anti-aging and self-healing SMB. The structures of VTES-MMT and AC were characterized, and the effects of VTES-MMT and AC on the microstructure, physical properties, mechanical properties, self-healing properties and aging properties of SMB were systematically investigated. The results show that vinyl-functionalized VTES-MMT and AC with vinyl ends were successfully synthesized and they have good thermal stability. VTES-MMT and dynamic acylhydrazone bonds were introduced into SMB through the cross-linking reaction between vinyl and SBS. VTES-MMT and AC improved the dispersion stability, physical and mechanical properties of SMB and endowed it with excellent crack self-healing properties. Compared with SMB, the healing index (HI) and the impermeable pressure of VTES-MMT/AC/SMB increased by 52.86 % and 0.41 MPa. The introduction of VTES-MMT and dynamic acylhydrazone bonds effectively mitigated the oxidative condensation of bitumen and the chain-breaking degradation of SBS during the aging process. Compared with SMB, the low temperature flexibility increment, elongation at break retention rate and peel strength retention rate of VTES-MMT/AC/SMB were reduced by 6℃, 18.66 % and 21.76 % after UV aging, respectively. The cracks of VTES-MMT/AC/SMB could still be healed completely after aging, and its HI and impermeability pressure decreased by only 14.38 % and 0.08 MPa after UV aging, which implied that the synergistic effect of VTES-MMT and AC significantly improved the aging resistance of SMB, and VTES-MMT/AC/SMB still maintained a good crack self-healing ability after aging.
研究领域:
材料科学
·
高分子化学
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土木工程
·
纳米技术
✓ 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
Materials Today Communications
·
2024
·
IF 3.7
Tianwei Zhang,Shanjun Gao,Yanheng He,Quantao Liu,Shi Xu,Ronghua Zhuang,Shangheng Zeng,Jianying Yu
The introduction of dynamic chemical bonds (disulfide bonds, hydrogen bonds, etc.) into the network structure of SBS modified asphalt (SMA) can notably improve its healing properties. However, aging may break the dynamic chemical bonds in self-healing SMA, thereby deteriorating its healing ability. Therefore, it is crucial to investigate the effects of aging on the structure and properties of self-healing SMA with dynamic chemical bonds. Herein, self-healing SBS modified asphalts (SD/SMA and DDH/SMA) containing single disulfide bonds (SD) and dual disulfide bonds and hydrogen bonds (DDH) were prepared by free radical reaction, respectively. The SD/SMA and DDH/SMA were subjected to Thin Film Oven Test (TFOT) aging and Pressurized Aging Vessel (PAV) aging. Chemical structure analysis showed that the disulfide bonds underwent partial break after PAV aging. Nevertheless, the results of the healing tests indicated that compared to SMA, SD/SMA and DDH/SMA maintained superior healing properties after aging under the break-reorganization effect of dynamic chemical bonds. The fatigue healing indices of SD/SMA and DDH/SMA were 51.9 % and 95.8 % higher than those of SMA after PAV aging. The rheology tests revealed that SD/SMA and DDH/SMA had higher recovery rates and low-temperature cracking resistance than SMA before and after aging. Compared with SMA, SD/SMA and DDH/SMA had superior anti-aging performance. After PAV aging, the ductility retention rate of SD/SMA and DDH/SMA was 72.9 % and 98.9 % higher than that of SMA. Furthermore, compared to SD/SMA, DDH/SMA containing dual disulfide and hydrogen bonds had better healing capability, rheological properties and anti-aging performance.
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
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
·
2018
·
IF 3.485
Jingjing Si,Zhaoxia Jia,Junyan Wang,Xin Yu,Yang Li,Fuqiang Dong,Ruiling Jiang
The research evaluated the properties of cold-mixed epoxy asphalt (EA) and cold-mixed epoxy styrene–butadiene–styrene (SBS)-modified asphalt (ESA) for paving steel-deck bridges. Compared with ESA, EA showed longer pot life and better processability at ambient temperature, as revealed by curing rheology analysis. The cured EA showed higher glass-transition temperature, superior thermal stability, tensile strength and elongation at breaking than ESA. These may be as a result of: (i) the high thermal stability of asphalt, (ii) the formation of a cross-linking network in the cured material, and (iii) the good compatibility between the epoxy resin and the asphalt.
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
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
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Youchao Chen,Junxian Huang,Yaseen Muhammad,Zhenxia Zhao,Shencheng Fan,Wenjie Luo,Jing Li
Based on the four-component separation technology of asphalt, the influence mechanism of carbon nanotubes (CNTs), graphene microsheets (GNPs) and graphene oxide (GO) in SBS-modified asphalt four-component was systematically analyzed by combining macroscopic properties and microscopic characteristics, as well as exploring the morphological distribution of SBS in asphalt four-component. According to the results of Fourier transform infrared spectroscopy and field emission scanning electron microscopy, the modification mechanism of asphalt by three types of carbon nanomaterials follows two pathways: chemical reaction and physical blending. The addition of CNTs, GNPs, and GO results in the destruction of long carbon chains of the saturated fraction in SBS-modified asphalt, and promotes the aggregation of SBS in the asphaltene, as well as its dense distribution and crosslinking in the oil fractions. The results of the fluorescence microscopy test and phase separation test showed that the dispersing effect of the three carbon nanomaterials could alleviate the aggregation phenomenon of SBS, improve the mutual integration between SBS and matrix asphalt, and promote the storage stability of SBS-modified asphalt. Therefore, based on the excellent mechanical properties of the three carbon nanomaterials and their promotion of filling and crosslinking of SBS in asphaltene, they have made significant contributions to the mechanical properties of carbon nanomaterials-composite SBS modified asphalt. This can also be demonstrated by DSR testing and conventional physical property testing. This study hopes to provide a viable analytical route for the use of nanomaterials in modulating the four-component structure and improving the properties of asphalt.
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
·
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
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Xing Liu,Hong Yuan Xing,Gang Liu,Wei Fu,Wen Bo Zeng
Based on the rheological property master curve, a new definition of ageing index was proposed for styrene-butadiene-styrene block copolymer (SBS) modified bitumen. The UV ageing resistance of the combined-modifier modified SBS bitumen was evaluated. Twelve different methods of combined modification were designed with three kinds of modifiers: ultraviolet absorber (Tinuvin 770), organic montmorillonite (OMMT) and layered double hydroxide (LDHs). With modified SBS bitumen, short-term ageing (TFOT) and laboratory ultraviolet ageing (UV) were performed. The dynamic shear rheometer (DSR) was used to perform frequency sweep test on the samples before and after ageing. The rheological property master curve was obtained by fitting the constitutive model equation. Based on the rheological property master curve, a new definition ageing index was proposed for SBS bitumen to evaluate the modified bitumen with different combined-modifier. The results show that the ageing index could effectively evaluate the UV ageing resistance of SBS bitumen. The evaluation results show that the combined-modifier bitumen exhibits better anti-ultraviolet ageing effects than a single modifier. Among them, the combined-modifier modes of 0.3%Tinuvin770+5%OMMT and 0.6%Tinuvin770+2.5%LDHs performed.
研究领域:
材料科学
·
土木工程
✓ 已验证
DOI
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Junxian Huang,Yu Liu,Sidra Subhan,Xingrong Quan,Hua Zhong,Jing Li,Zhenxia Zhao
Herein, fast and uniform deposition of tannic acid iron ion self-assembled metal–organic network (Fe 3+ -TA) was established using salt induction strategy over graphene oxide (GO) based styrene butadiene styrene (SBS) support (Fe 3+ -TA-GO/SBS) to prepare modified asphalt. Mechanical properties of the SBS modified asphalt (SBS-MA), GO/SBS-MA, and Fe3 + -TA-GO/SBS-MA were systematically studied via dynamic shear rheometer, multiple stress creep recovery test, and thermogravimetric analysis. The mechanism of Fe 3+ -TA-GO in SBS-MA was elucidated by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. Results showed that the penetration of 0.10 % Fe 3+ -TA-GO/SBS-MA is 38.3 % lower than that of SBS-MA, which indicates excellent viscoelastic properties, rutting resistance, and thermal stability 0.10 % Fe 3+ -TA-GO/SBS-MA modified asphalt. This green biomimetic modification method effectively solves the agglomeration problem of GO in asphalt and promotes the formation of a well-developed SBS network structure in Fe 3+ -TA-GO/SBS-MA, which could be considered as a promising approach for the preparation of modified asphalt with enhanced properties for practical applications.
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Yinqiao Xu,Quantao Liu,Huan Wang,Shaopeng Wu
The aging of asphalt mixtures shortens the lifespan of asphalt pavements. Incorporating antioxidant intercalated layered double hydroxides (OLDHs) into asphalt is a viable approach to enhance the resistance of the asphalt binder to aging. However, OLDHs hasn’t been optimized and its effectiveness in asphalt mixture is not clear. This study is to synthetize different OLDHs and examine their enhancements on the anti-aging performance of SBS modified asphalt mixture (SMAM). For this purpose, ion-exchange method was employed to intercalate antioxidant 1222, antioxidant 1010, and 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid into the interlayers of Mg/Al-LDHs to prepare different OLDHs (designated as 1010-LDHs, 1222-LDHs, and 3B-LDHs, respectively). The synthesized OLDHs were characterized by crystal phase, chemical structure, micro-morphology, UV–visible spectroscopy and free radical scavenging tests. The three prepared OLDHs were then added to the SBS modified asphalt (SBSMA) and mixtures were prepared with both OLDHs-containing and non-OLDHs-containing asphalts. Aging tests were conducted, and the changes in pavement performance of different mixtures before and after aging were compared to assess the effects of OLDHs on the anti-aging properties of SMAM. Finally, asphalt binders were extracted from different aged mixtures and subjected to relevant tests. The results indicate that all three antioxidants were successfully intercalated into the LDHs while maintaining the layered structure. Additionally, the incorporation of the three OLDHs improved the ultraviolet and thermal-oxidative aging (TO aging) resistances of the SMAM. Among the three, 3B-LDHs demonstrated the best anti-aging enhancement at the same dosage. These findings offer a reference for studying and applying OLDHs to enhance the anti-aging properties of SMAM.
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
危险品化学品经营许可证（带存储）