Article
Green & Sustainable Science & Technology
Ke Shi, Feng Ma, Jun Liu, Rui-meng Song, Zhen Fu, Jia-sheng Dai, Chen Li, Ya-lu Wen
Summary: The objective of this study was to evaluate the effectiveness of active reagents and epoxidized soybean oil in rejuvenating aged SBS-modified asphalt binder by promoting the interaction of aged binders with virgin asphalts. Chemical and engineering methods were combined to characterize the asphalt binders and assess their fatigue, rutting, and thermal cracking resistance. The results showed that the addition of ESO adjusted the low temperature performance of SBSPAV, while HMDI and ESO improved the high temperature performance. HMDI showed better elastic recovery and resistance to permanent deformation than other binders.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Fuqiang Dong, Jincheng Wang, Xin Yu, Mengmeng Jiang, Yongjia Guo, Shiyu Wang, Yuanzhe Zu, Shisong Ren
Summary: In this study, environmentally friendly rejuvenators composed of waste thermal conductive oil, polymer, and interfacial reinforcing agent were prepared. The effects of different rejuvenators on the rejuvenation mechanisms of aged SBS modified asphalt were characterized at different scales, including molecule structure, morphology, phase transition, interface adhesion characteristic, and macro performance. The results showed that the rejuvenator could improve the molecular weight distribution of asphalt binders and reform the cross-linking structure of SBS phase. The addition of regenerant-II had a better recovery effect on the morphology structure and thermal behavior, while regenerant-III enhanced the adhesion work of the original SBS modified asphalt.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Guannan Li, Zhaojun Gu, Yiqiu Tan, Chao Xing, Junjie Zhang, Chao Zhang
Summary: This study investigates the phase structure of SBS modified asphalt by considering different block ratios and concentrations of SBS molecules. It is found that SBS molecules form dispersed phase at low concentrations and transition to continuous phase as the concentration increases. Resins and aromatics exhibit higher adsorption capacity towards SBS, while asphaltenes show similar adsorption to saturates. The phase structure change has a significant impact on the number of adsorbed molecules.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Ke Shi, Feng Ma, Jenny Liu, Zhen Fu, Ruimeng Song, Dongdong Yuan, Chen Li
Summary: The rejuvenation effect of active reagents on aged SBS modified asphalt was investigated using molecular dynamics simulation. The results showed that repairing the broken SBS molecular structure can significantly impact the performance of rejuvenated asphalt binder.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Peixin Xu, Derun Zhang, Ziyang Liu, Chaoliang Fu, Huijie Lv
Summary: A green compound rejuvenator was developed to restore the properties of aged SBS modified asphalt. The rejuvenator utilizes a synchronous rejuvenating mechanism to regulate the colloidal structure and reconstruct the polymer structure, restoring the performance of the SBS modifier. The test results showed that the rejuvenated asphalt had properties closest to the virgin asphalt.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Zhilong Cao, Jianying Yu, Juan Yi, Guoqiang Sun, Kexin Qiu, Song Xu, Xiaobin Han
Summary: This study focused on the recovery effect of fatigue resistance for aged SBS modified asphalt (ASMB) through different rejuvenation methods. The results showed that the reactive rejuvenation method was more effective in restoring the properties of ASMB compared to the common rejuvenation method. The fatigue behavior of ASMB was significantly improved after reactive rejuvenation, as indicated by multi-stress creep and recovery test, linear amplitude sweep test, and fatigue-healing-fatigue test. The findings emphasized the importance of reducing the adverse effects of aged asphalt and reconstructing the broken SBS cross-linking structure during the rejuvenation process for restoring the fatigue resistance of ASMB.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Wenhui Zhao, Jiuguang Geng, Mingyuan Chen, Xu Li, Yanhui Niu
Summary: The content of SBS modifier in SBS modified asphalt greatly affects its physical and chemical characteristics, but determining the SBS content after aging is still a challenge. In this study, FTIR and potentiometric titration tests were used to detect the SBS content of aged binders, and it was found that these tests can effectively predict the SBS content and analyze the aging degree of SBS modified asphalt.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Polymer Science
Dongdong Yuan, Chengwei Xing, Wei Jiang, Jingjing Xiao, Wangjie Wu, Pengfei Li, Yupeng Li
Summary: This study investigated the effect of styrene-butadiene-styrene (SBS) modifier content on the viscoelastic behavior of SBS-modified asphalt (SBSMA) at different temperatures and phase structures. The results showed that there was an apparent turning point at 4.5% content at high temperatures. The fatigue life of SBSMA increased exponentially with the rising modifier content at medium temperatures. At low temperatures, the low-temperature viscoelastic property index of SBSMA decreased logarithmically as the modifier content increased. Microscopic analysis revealed that the SBS modifier changed from dispersed to continuous phase state with increasing content.
Article
Construction & Building Technology
Hangtian Ni, Mingjun Hu, Daquan Sun, Lei Xu, Senlin Ling, Tong Lu, Yue Deng
Summary: This paper proposes a novel method of SBS-independent weathering to determine the aging behavior of SBS and its effect on the performance of modified asphalt. By correlating different samples, the effective content equation of SBS under weathering conditions and the conversion coefficient between different aging methods were determined. The results show that the degradation pattern of weathering SBS follows a single exponential decay function, and the effective content of SBS decreases gradually after accelerated weathering.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Chongzheng Zhu, Henglong Zhang, Bangyao Tan, Quan Li, Fu Xu
Summary: A novel rejuvenator (RA) combined with fresh styrene-butadiene-styrene block copolymers modified asphalt (SBSMA) was used to effectively restore the performance of field-aged SBSMA. The rheological properties and micro characteristics of recycled SBSMA were investigated. The results showed that RA could alleviate the aging behavior of recycled SBSMA from the molecular structure and enhance the compatibility between SBS modifier and asphalt.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Jing Xu, Jianzhong Pei, Jun Cai, Tao Liu, Yong Wen
Summary: The study demonstrates that adding oils can improve the performance of SBS modified asphalt, with bio-oil showing higher efficiency than REOB. Tests at different aging states indicate that low-temperature performance depends on the ability to relax internal stress. FTIR scanning and aging indices show that performance-related characteristics and chemical changes mainly occur during long-term aging.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xiaolong Yang, Guiyong Liu, Hongliu Rong, Yongjun Meng, Chunhong Peng, Minqiang Pan, Zhikang Ning, Guangchen Wang
Summary: The mechanical properties of composite modified asphalt and the interaction mechanism of each modifier were investigated. The results showed that PPA and BA can improve the storage stability of SBS modified asphalt, and the composite modified asphalt with lower SBS content still has excellent performance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xiaobin Han, Sanpeng Mao, Shangheng Zeng, Zhilong Cao, Peng He, Wei Du, Jianying Yu
Summary: In this study, the effect of novel long-chain active composite rejuvenators (NLCACRs) on the interfacial adhesion between aged SBS modified asphalt and granite was evaluated using surface free energy method, boiling water test method, and related parameters. The results showed that NLCACRs could increase the surface free energy of the asphalt and improve its cohesion work. They also significantly increased the interfacial adhesion between the asphalt and granite, and reduced the moisture sensitivity of the asphalt-aggregate system. The study demonstrated the potential application of NLCACRs in improving the moisture stability of aged SBS modified asphalt mixture.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Construction & Building Technology
Mingyuan Chen, Jiuguang Geng, Caiyun Xia, Leilei He, Zhuo Liu
Summary: This article reviews the changes in phase structure of SBSMA, analyzes the influencing factors, summarizes the phase structure analysis methods, and finally concludes the phase structure stability of SBSMA mixed with other materials.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xiaolong Yang, Chunhong Peng, Jiangcai Chen, Guiyong Liu, Xinyi He
Summary: By analyzing the rheological properties of bio-asphalt, the effectiveness of bio-asphalt as a substitute for petroleum asphalt has been explored. The addition of bio-asphalt improves the low-temperature rheological properties of modified asphalt while reducing the high-temperature rheological properties. The combination of bio-asphalt, SBS, and PPA exhibits excellent performance in high and low-temperature conditions. This study reveals the mechanism of bio-asphalt improving the compatibility of SBS and PPA in asphalt.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
