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Sensitivity analysis of complex shear modulus using Hirsch model

  • Flávio R. G. Padula
  • Sidney Nicodemos
  • Júlia C. MendesEmail author
  • Richard Willis
Article
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Abstract

The present work evaluates the factors that affecting estimation of the Complex Shear Modulus (G*) of a binder when this estimation is done through an indirect approach: the Hirsch model. This technique consists of (i) testing specimens for dynamic modulus (E*) and (ii) back calculating the G* using the Hirsch model. To this purpose, four virgin asphalt binders were performance-graded with frequency sweeps to determine the appropriate properties. The data obtained from the laboratory tests were used in the Hirsch model for E* prediction. Subsequently, the Bulk Specific Gravity (Gsb) and G* were altered to determine the sensitivity of the Hirsch model to these estimations in terms of E*. Finally, the Gsb was altered, and the G* was estimated. The results showed that the estimation of G* presents more reproducibility for higher temperatures and lower frequencies. In conclusion, the estimation G* in hot mix asphalt designs using the Hirsch model is a promising alternative.

Keywords

Reclaimed asphalt pavement Binder grade Complex shear modulus Dynamic modulus Hirsch model Hot mix asphalt 

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Copyright information

© Higher Education Press Limited Company 2019

Authors and Affiliations

  • Flávio R. G. Padula
    • 1
  • Sidney Nicodemos
    • 1
  • Júlia C. Mendes
    • 2
    Email author
  • Richard Willis
    • 3
  1. 1.Department of Civil EngineeringFederal Center for Technological Education of Minas Gerais (CEFET-MG)Belo HorizonteBrazil
  2. 2.Department of Civil EngineeringFederal University of Ouro Preto (UFOP)Ouro PretoBrazil
  3. 3.Pavement Engineering & Innovation, National Asphalt Pavement Association (NAPA)LanhamUSA

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