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Sensitivity analysis of complex shear modulus using Hirsch model

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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.

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Authors and Affiliations

  1. Department of Civil Engineering, Federal Center for Technological Education of Minas Gerais (CEFET-MG), Belo Horizonte, Brazil

    Flávio R. G. Padula & Sidney Nicodemos

  2. Department of Civil Engineering, Federal University of Ouro Preto (UFOP), Ouro Preto, Brazil

    Júlia C. Mendes

  3. Pavement Engineering & Innovation, National Asphalt Pavement Association (NAPA), Lanham, USA

    Richard Willis

Authors
  1. Flávio R. G. Padula
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  2. Sidney Nicodemos
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  3. Júlia C. Mendes
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  4. Richard Willis
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Corresponding author

Correspondence to Júlia C. Mendes.

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Peer review under responsibility of Chinese Society of Pavement Engineering.

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Padula, F.R.G., Nicodemos, S., Mendes, J.C. et al. Sensitivity analysis of complex shear modulus using Hirsch model. Int. J. Pavement Res. Technol. 12, 125–130 (2019). https://doi.org/10.1007/s42947-019-0016-1

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  • DOI: https://doi.org/10.1007/s42947-019-0016-1

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