Field Evaluation of Asphalt Film Thickness as a Design Parameter in Superpave Mix Design

Research shows that mix performance is related to asphalt film thickness (AFT). Due to the complexity of estimating AFT based on mix parameters, AFT use as a mix design parameter has always been a challenge. In the calculation of AFT, aggregate surface area and effective volume of asphalt are important components. In this study, there is comparison of the voids in mineral aggregate (VMA) and AFT as mix design parameters against Superpave mix field performance. There was estimation of film thickness by different formulas using calculated aggregate surface areas. Data on Superpave mix early flushing sections was used for correlation of film thickness to mix design parameters, such as distress development. There was observation of flushing and rutting problems in pavement sections considered for the study. Field cores were obtained from flushed and non-flushed sections for Superpave specification compliance. Research results related mix design parameters to AFT but showed that, depending on calculation method, as a mix design parameter, AFT may or may not be helpful in explaining rutting, bleeding, and other specific field performance distresses.

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  • Authors:
    • Attia, Mohamed I
    • Abdelrahman, Magdy A
    • Molakatalla, Udit
    • Salem, Hassan M
  • Publication Date: 2009-9


  • English

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  • Accession Number: 01145232
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 6 2009 12:51PM