Comparison of Laboratory and Field Aging Properties of Different Asphalt Binders

    Volume 2, Issue 1

    ISSN: 2165-3984

    CODEN: ACEMOAD

    Published Online: 27 June 2013

    Page Count: 19


    Biligiri, Krishna Prapoorna
    Senior Research Fellow, Center for Infrastructure, Sustainable Transportation and Urban Planning, Indian Institute of Science, Bangalore, Karnataka

    Way, George Bert
    Chief Engineer, Consulpav International, Inc., Scottsdale, AZ

    (Received 17 January 2013; accepted 22 May 2013)

    Abstract

    In the past four decades, many states in the United States, including Arizona, have successfully used modified binders such as asphalt rubber (AR), defined by ASTM D6114, to reduce pavement distress and associated maintenance costs. The main objective of this study was to understand the aging characteristics of unaged and aged neat asphalt and AR binders using more than 25 years' worth of data from field and laboratory studies covering over 157 test sections in Arizona and 318 binder types with 957 data points. Trend relationships of the routine binder test results for neat and AR binders with respect to age were developed and resulted in fair correlations. AR binders had higher core-aged penetration and very low viscosities at all time-scales relative to neat binders. Furthermore, the performance grade system's shear modulus G*–phase angle δ relationship for the neat binders was excellent and rational with respect to aging. G* and δ for the neat binders were mathematically related to the routine microviscosity test. The inverse relationship of age versus microviscosity relative to δ exemplified that with an increase in the binder (micro)viscosity, the material showed increased elastic behavior. In a well-connected analysis using special sections of neat and AR binders, (i) neat binder data were positioned in close proximity to the δ–age relationship within the pressure aging vessel (PAV) long-term aging zone, validating that the PAV method ostensibly used for neat binders is rational and represents 8 to 10 years of aging and 15 % cracking; and (ii) AR binder data were not near the laboratory δ–age relationship, indicative of the fact that the viscous component (δ) symbolizing the aging phenomenon altered at a slower rate for AR than for the neat binders. Although the overall findings represent limited AR data, this study has provided a fair understanding of the aging characteristics of the two different binders.


    Paper ID: ACEM20130061

    DOI: 10.1520/ACEM20130061

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    Author
    Title Comparison of Laboratory and Field Aging Properties of Different Asphalt Binders
    Symposium , 0000-00-00
    Committee D04