首页|Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation
Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation
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NETL
NSTL
Elsevier
The aging of SBS modified bitumen (SMB) involves bitumen aging and SBS degradation. Traditional rejuvenators restore bitumen properties by rebalancing its chemical composition but fail to repair damaged SBS. Some reactive rejuvenators can repair damaged SBS, improving low temperature performance of rejuvenated SMB but compromising high temperature stability. In order to achieve rejuvenated SMB with excellent high and low temperature performance, an aliphatic epoxy compound (1,6-hexanediol diglycidyl ether, HDE), aromatic epoxy compounds (resorcinol diglycidyl ether, RDGE; 2,2-bis (4-glycidyloxyphenyl) propane, DGEBA; N, N, N', N'-tetraglycidyl-4,4'-diaminodiphenylmethane, MBDA), a catalyst (Pentaethylenehexamine, PEHA) as well as bio-oil were utilized to develop a novel composite reactive rejuvenation system. The optimal composition of rejuvenation system was determined through physical properties test, followed by rheological test to evaluate rheological properties of rejuvenated SMB. The rejuvenation effect of the composite system was demonstrated using FTIR and FM tests, and the molecular dynamics simulation was conducted to explore the composite reaction rejuvenation mechanism of aged SMB. Results show that the combination of HDE and DGEBA presents superior effectiveness compared to others. SBS repaired with HDE exhibits enhanced flexibility, allowing for greater molecular chain rearrangement, which leads to a looser molecular structure and increased free volume fraction, enabling rejuvenated SMB to maintain better deformability at low temperatures. The incorporation of DGEBA introduces rigid groups that constrain molecular chain conformation and slippage, rotation, or stretching between chain segments, which reduces the free volume fraction and improves deformation resistance. Besides, SBS repaired with DGEBA shows stronger interactions with asphaltenes, better restricting their mobility and enhancing the rigidity of bitumen. At an HDE: DGEBA ratio of 1:1, with a total dosage of 5 wt % by weight of bitumen, the composite reactive rejuvenation system restores crosslinking network of SBS in bitumen and achieves rejuvenated SMB with excellent high and low temperature performance.
SBS modified bitumenAll-component rejuvenationPerformance evaluationMolecular dynamics simulationRejuvenation mechanism analysis
Song Xu、Xiangjie Niu、Shilong Pan、Bingtao Xu、Shaoxu Cai、Lei Fang、Zhilong Cao、Hongyan Ma
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College of Civil Engineering Fuzhou University, Fuzhou 350108, PR China||School of Advanced Manufacturing, Fuzhou University, Quanzhou 362200, PR China
College of Civil Engineering Fuzhou University, Fuzhou 350108, PR China
School of Advanced Manufacturing, Fuzhou University, Quanzhou 362200, PR China
Department of Road and Railway Engineering, Beijing University of Technology, Beijing 100124, PR China
NETL
NSTL
Elsevier
