Utilization of Lignin as an Antioxidant in Asphalt Binder
Author(s):
Shikha D Asukar, Mrs. Ambika Behl, Prof. (Dr.) P. J. Gundaliya
Keywords:
Asphalt binder, FTIR, Lignin, Oxidation, Pavement aging, Rheological properties
Abstract
The objective of this study is to investigate the viability of utilizing lignin as an antioxidant for arresting the aging of the bituminous binder. Oxidation is the primary cause of long-term aging in asphalt pavements. As a pavement oxidizes, it stiffens and can eventually crack. The use of an antioxidant as a performance enhancer in an asphalt binder could delay aging, thus increasing the life of an asphalt pavement. Lignin is highly available and well-studied antioxidant. In the present investigation, the rheological properties were characterized for bitumen binder blended with an organic lignin, ‘Lignin 1’, and a processed lignosulphonate, ‘Lignin 2’, at different percentages (5% and 7%) by weight of the base binder. Rotational Viscometer (RV) and Dynamic Shear Rheometer (DSR) tests were conducted for the rheological properties, and the Rolling Thin-Film Oven (RTFO) test and Pressurized Aging Vessel (PAV) tests were conducted for the simulation of aging. The aging index was developed for all the blends. The rheological properties of the bituminous binder in terms of their complex modulus (G*), phase angle (δ), rutting parameter (G*/sinδ) and fatigue parameter (G*×sinδ) were measured. Furthermore, the oxidation characterization was investigated through the Fourier Transform Infrared Spectroscopy (FTIR) test. Comparison of results for the unmodified binders and lignin modified binders were done, to identify the effect on aging on addition of lignin. It was concluded that lignin showed some antioxidant activity when added to asphalt binder, which was supported by FTIR results.
Article Details
Unique Paper ID: 143626

Publication Volume & Issue: Volume 2, Issue 12

Page(s): 198 - 207
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