Use of WLF Equation to Capture Short Term Aging Characteristics of Asphalt Binder

Author(s): Priyansh Singh and Aravind K. Swamy
Paper category: Proceedings
Book title: Proceedings of the 71st RILEM Annual Week & ICACMS 2017,Chennai,India, 3rd -8th September 2017
Editor(s): Manu Santhanam
Ravindra Gettu
Radhakrishna G. Pillai
Sunitha K. Nayar
ISBN: 978-2-35158-196-4
ISBN: 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9:
Publisher: Published by RILEM Publications S.A.R.L.
Publication year: 2017
Pages: 512-519
Total Pages: 8
Language : English

Abstract: During production, placement and service life of hot mix asphalt, the asphalt binder undergoes
changes in its properties. These changes commonly referred to as aging is due to volatilization,
and oxidation. With aging, viscosity and complex modulus of binder increases and phase angle
decreases. Subsequently, the asphalt within HMA becomes stiffer and its potential to resist
fatigue decreases. Therefore, prediction of asphalt binder response with aging is important part
of binder characterization and selection procedure. This paper discusses the shift factor
approach to model aging characteristics of asphalt binder. Three binders (one unmodified and
two modified) were aged for four different time using rolling thin film oven. These aged binders
were tested for its complex modulus values at various temperatures and frequencies. Using
these measurements, the individual complex modulus master curves were constructed for
binders aged for different aging time. These mastercurves were shifted horizontally until
sufficient overlap is obtained with binder at reference condition. The amount of horizontal shift
was quantified using aging shift factors. The study found that the aging could be satisfactorily
modelled using aging shift factors for modified and unmodified binders.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00