Master Curves for Stiffness Asphalt Concrete

A methodology is presented in this paper which attempts to construct asphalt mixture stiffness master curves. The asphalt concrete stiffness modulus in asphalt pavements increases as temperature decreases and loading frequency increases. Reference temperature can be assembled after a complete modulus time behavior curve is chosen due to horizontal shifting, for various temperatures with respect to the curve chosen as reference, stiffness modulus versus loading time relationship. Physical observations form the basis of the proposed model. It is believed to reasonably estimate mix stiffness at any arbitrary loading frequency. The master curve determination technique is based of the principle of thermo rheological simplicity or time temperature correspondence. Data of other temperature under horizontal shift until they fit the reference temperature curve since, by choosing a reference temperature, experimental data are plotted against the log frequency or log loading timing. There is then shifting of data acquired from other temperature until they fix the extended reference curve. Fitting a sigmoid function by using non linear least square regression techniques can construct a master curve. An experimental approach is used to do the shifting through solving shift factors simultaneously with model parameters. The need to assume any shift factor equation functional form is not part of its completion. The paper attempts to show, based on the material, that a sigmoid model can be best described as asphalt concrete mix stiffness master curve. The physical behavior of asphalt concrete can also be explained by this model.

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  • Authors:
    • Jahromi, Saeed Ghaffarpour
    • Khodaii, Ali
  • Publication Date: 2009-7


  • English

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  • Accession Number: 01145237
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 30 2009 5:18PM