| Title |
Chemical and rheological analysis of unaged and aged bio-extended binders containing lignin |
| ID_Doc |
14268 |
| Authors |
Gaudenzi, E; Cardone, F; Lu, XH; Canestrari, F |
| Title |
Chemical and rheological analysis of unaged and aged bio-extended binders containing lignin |
| Year |
2023 |
| Published |
Journal Of Traffic And Transportation Engineering-English Edition, 10, 6 |
| DOI |
10.1016/j.jtte.2023.05.005 |
| Abstract |
The use of alternative renewable sources to totally or partially replace bitumen is one of the most current challenges in the road pavement sector. The growing energy cost and environmental concerns lead to the necessity to find alternative solutions, by supporting at the same time sustainability and circular economy principles. Within this framework, this paper presents the application of a powder lignin, a natural bio-polymer deriving from byproducts of wood pulp and paper industry, to replace part of bitumen. The bituminous blend consisting in 70% of bitumen and 30% of powder lignin (by weight) was made in laboratory through the use of a high shear stirring mixer, and a reference plain bitumen characterized by a similar consistency (i.e., same penetration grade) was used as comparison. Then, an extensive investigation on chemical and rheological properties of the bio-binder is presented. Fourier transform infrared spectroscopy (FTIR), saturates, aromatics, resins and asphaltenes (SARA), bending beam rheometer (BBR), frequency sweep tests and multiple stress creep recovery tests (MSCR) with a dynamic shear rheometer (DSR) were performed. Moreover, unaged, short- and long-term aging conditions were considered. Results indicated that powder lignin dominates the rheological behavior of the bio-binder and, from chemical analysis, it seems that it partially acts as a filler and partially as a binder. This would result in improved performances at both low and high temperatures, leading to a wider temperature range of performance grade (PG). Moreover, despite a stiffening effect is recognized, lignin also offers an antioxidant potentiality, reducing the aging susceptibility of the investigated bio-binder. (c) 2023 Periodical Offices of Chang'an University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC -ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Author Keywords |
Bio-binders; Asphalt binders; Lignin; Aging; Sustainability |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Emerging Sources Citation Index (ESCI) |
| EID |
WOS:001184865300001 |
| WoS Category |
Engineering, Civil; Transportation Science & Technology |
| Research Area |
Engineering; Transportation |
| PDF |
https://doi.org/10.1016/j.jtte.2023.05.005
|