Print Email Facebook Twitter ESEM observation and rheological analysis of rejuvenated SBS modified bitumen Title ESEM observation and rheological analysis of rejuvenated SBS modified bitumen Author Lin, P. (TU Delft Pavement Engineering) Liu, X. (TU Delft Pavement Engineering) Apostolidis, P. (TU Delft Pavement Engineering) Erkens, S. (TU Delft Pavement Engineering) Zhang, Y. (Chang'an University) Ren, S. (TU Delft Pavement Engineering) Date 2021 Abstract Observing the microstructure of bituminous binders with an environmental scanning electron microscope (ESEM) can contribute significantly to reveal the underlying rejuvenation mechanism. In this study, three rejuvenators were selected to regenerate the aged SBS modified binders at five dosages, and their rheology was evaluated using a dynamic shear rheometer. ESEM was employed to examine the microstructure of binders as well, and a series of microstructure parameters were quantified with image analysis. The results demonstrated that the chemical composition changes correspond to the evolution of microstructure morphological and rheological properties. Moreover, the rheological and microstructure characteristics were analyzed with Principal Component Analysis (PCA) and regression analysis. Based on PCA results, the microstructure of rejuvenated binders has shown a good correlation with stiffness after combining various principal components. According to regression analysis, the distance between adjacent fibrils exhibited a significant correlation with Jnr3.2 and the complex modulus index. Overall, the results of this study strengthen the hypothesis that the ESEM microstructure is intimately correlated with chemical composition and rheological properties, rather than with irrelevant surface phenomena. To reference this document use: http://resolver.tudelft.nl/uuid:4b2496c0-ca8b-482c-94e2-b9cc141995b0 DOI https://doi.org/10.1016/j.matdes.2021.109639 ISSN 0264-1275 Source Materials & Design, 204, 1-18 Part of collection Institutional Repository Document type journal article Rights © 2021 P. Lin, X. Liu, P. Apostolidis, S. Erkens, Y. Zhang, S. Ren Files PDF 1_s2.0_S0264127521001921_main.pdf 6.29 MB Close viewer /islandora/object/uuid:4b2496c0-ca8b-482c-94e2-b9cc141995b0/datastream/OBJ/view