Evaluation of mechanical properties and aging index of 10-year field aged asphalt materials

Abstract: Ten years’ field aged asphalt specimens have collected and being detailed studied. The aging index, viscoelastic behavior of aged binder recovered from the cored specimens, indirect tensile strength and residual fatigue life of the top layer and underneath layer were studied. Saturates, Aromatics, Resins and Asphaltenes (SARA) analysis and Fourier Transform Infrared Analysis (FTIR), viscoelastic analysis, Indirect Tensile (IDT) resilient modulus and fatigue test were performed.

Both SARA, FTIR and viscoelastic analysis indicates that traffic loading does have positive degradation influence on asphalt binder. FTIR shows that traffic loading has limited influence on the chemic changes of S=O compounds, while has positive contribution on degrading the C=C bonds and hence promotes the oxidize aging. Although surface layer can protect underneath asphalt layer from aging, 10-year field aging would introduce significant deterioration onto the underneath layer. The effective aging depth can go as deep as to the second layer. Fatigue tests illustrate that 10-year service has resulted in very weak asphalt pavement surface. Its fatigue life is very sensitive to traffic loading.

Keywords: Asphalt pavement; Aging index; Asphalt aging; Asphalt binder; Residual mechanical property

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S.P. Wu, Z.J. Zhao, Y. Xiao* (Corresponding Author), M.W. Yi, Z.W. Chen, M.L. Li. Evaluation of mechanical properties and aging index of 10-year field aged asphalt materials, Construction and Building Materials, Volume 155, 30 November 2017, P: 1158-1167.

About Yue

An Associate Professor from State Key Lab of Silicate Materials for Architectures in Wuhan University of Technology, China since January 2014. Received PhD degree in Road and Railway Engineering in 2013 from Delft University of Technology in the Netherlands. His research interests are on asphalt pavement surfacing, road and pavement materials, asphalt pavement design.
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