Comparison between Viscoelastic Mechanical and Chemical Kinetic Aging Model of Asphalt Concrete

  • 李 智堯

Student thesis: Master's Thesis

Abstract

The cause of the oxidative aging is due to the formation of carbonyl compound that transform the light molecular weight compound (naphthene aromatic and the polar aromatic) into large molecular weight (asphaltene) within the asphalt binder Recent study proposed a mechanical based oxidative aging modelling by introducing oxidative aging variable which is conceptually model the carbonyl formation rate of asphalt materials during the long-term aging process Thus the objective of this study was to fully characterize and validate the mechanical-based aging model parameters and compared with the chemical kinetic model To achieve the desired goal the loose mix asphalt and the asphalt binder aged to five different level of aging (two temperatures and two periods of time) with the addition of two oxygen contents for the asphalt binder aging Dynamic modulus test and linear frequency sweep test were used characterize the mechanical response of asphalt concrete and binder respectively Fourier transform infrared spectroscopy (FTIR) test was employed to investigate the change of chemical compound in the asphalt binder The results then used to characterize and validate the linear viscoelastic mechanical-based aging model parameters This study found that the aging variable value decreased with the aggregate involved The aging model parameters of asphalt binder have evaluated and the values were 0 0269 8 570 8 640 1 598 for Γ? k1 k2 k3 respectively where asphalt concrete were 0 0013 8 570 5 978 0 780 The study also found that the aging history dependent (k2) discovered in this study allow the model to simulate the actual aging behavior as a polynomial curve The Pearson correlation test showed that there is a strong relationship between the carbonyl content and the aging model variable
Date of Award2017 Aug 18
Original languageEnglish
SupervisorShih-Hsien Yang (Supervisor)

Cite this

Comparison between Viscoelastic Mechanical and Chemical Kinetic Aging Model of Asphalt Concrete
智堯, 李. (Author). 2017 Aug 18

Student thesis: Master's Thesis