Development of Test Procedures to Evaluate Moisture Susceptibility of Asphalt Mixtures Used in the State of Kansas, Phase I: Surface Free Energy of Binders
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Development of Test Procedures to Evaluate Moisture Susceptibility of Asphalt Mixtures Used in the State of Kansas, Phase I: Surface Free Energy of Binders

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English
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  • Creators:
  • Corporate Creators:
    University of Kansas. Dept. of Civil, Environmental and Architectural Engineering
  • Corporate Contributors:
    Arkansas. Department of Transportation
  • Subject/TRT Terms:
  • Publication/ Report Number:
    KS-24-06
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • Edition:
    Final Report August 2018 – September 2022
  • Corporate Publisher:
    Kansas. Department of Transportation
  • Abstract:
    The surface free energy of asphalt binders and aggregates is a critical material property related to the moisture sensitivity of asphalt mixtures. Surface free energies of these materials can be used to quantitatively determine the interfacial adhesive bond strength between two materials and the tendency of water to displace this bond based on fundamental principles of thermodynamics. Because the utilization of surface free energies to determine the moisture sensitivity of asphalt mixtures is already well established, efficient, and accurate methods to routinely measure the surface energies of asphalt binders and aggregates are needed to enhance material selection when designing moisture-resistant asphalt mixtures. Surface energies of these materials can also be combined with other material properties in conjunction with the principles of fracture mechanics to determine fatigue cracking and healing characteristics of asphalt mixtures. Therefore, the results from this study that calculates surface free energy components of different Asphalt binders can be used to select test methods and mathematical models based on fracture mechanics that relate material properties, including surface energy, to asphalt mixture performance. Surface energies of these materials can be used to calculate the energy ratio (ER) of asphalt binder-aggregate combinations to identify moisture resistance levels. A higher value of work of adhesion indicates that more work is required to break the adhesive bond between the asphalt binder and the aggregate, implying improved resistance to moisture damage. A lower magnitude of work of debonding indicates less energy potential for water to displace an asphalt binder from its interface with the aggregate and a higher resistance to moisture damage.
  • Format:
    PDF
  • Funding:
    C2126
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