Print Email Facebook Twitter Chemical and Rheological Evaluation of Aged Lignin-Modified Bitumen Title Chemical and Rheological Evaluation of Aged Lignin-Modified Bitumen Author Zhang, Yi (Chang'an University) Liu, X. (TU Delft Pavement Engineering) Apostolidis, P. (TU Delft Pavement Engineering) Gard, W.F. (TU Delft Bio-based Structures & Materials) van de Ven, Martin (TU Delft Pavement Engineering) Erkens, S. (TU Delft Pavement Engineering) Jing, R. (TU Delft Pavement Engineering) Date 2019 Abstract As bitumen oxidizes, material stiffening and embrittlement occur, and bitumen eventually cracks. The use of anti-oxidants, such as lignin, could be used to delay oxidative aging and to extend the lifetime of asphalt pavements. In this study, the chemical and rheological effect of lignin on bitumen was evaluated by using a single dosage organsolv lignin (10 wt.% dosage). A pressure aging vessel (PAV) was used to simulate the long-term aging process after performing the standard short-term aging procedure, and the lignin-modified bituminous binders were characterized by an environmental scanning electron microscope (ESEM), Fourier-transform infrared (FTIR) spectroscopy, and a dynamic shear rheometer (DSR). From the ESEM results, the uniform microstructure was observed, indicating that the addition of lignin did not affect the worm structure of bitumen. Based on the FTIR test results, lignin-modified bitumen showed that a lower number of carbonyl and sulfoxide compounds were generated after aging than for neat bitumen. Based on the linear amplitude sweep (LAS) results, the addition of lignin slightly reduced the fatigue life of bitumen. From the frequency sweep results, it showed that lignin in bitumen acts as a modifier since the physical interaction between lignin and bitumen predominantly affects the material rheology. Overall, lignin could be a promising anti-oxidant due to its economic and environmental benefits. Subject rheologyligninbitumenagingmicrostructurechemistry To reference this document use: http://resolver.tudelft.nl/uuid:ec86673b-5e0f-4fa6-b3b8-12d3105dd682 DOI https://doi.org/10.3390/ma12244176 ISSN 1996-1944 Source Materials, 12 (24) Part of collection Institutional Repository Document type journal article Rights © 2019 Yi Zhang, X. Liu, P. Apostolidis, W.F. Gard, Martin van de Ven, S. Erkens, R. Jing Files PDF materials_12_04176.pdf 5.57 MB Close viewer /islandora/object/uuid:ec86673b-5e0f-4fa6-b3b8-12d3105dd682/datastream/OBJ/view