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Comprehensive evaluation of the long-term performance of rubberized pavement, phase II : the influence of rubber and asphalt interaction on mixture durability.
  • Published Date:
    2014-12-01
  • Language:
    English
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Comprehensive evaluation of the long-term performance of rubberized pavement, phase II : the influence of rubber and asphalt interaction on mixture durability.
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  • Corporate Creators:
  • Publication/ Report Number:
    FHWA-GA-12-1229
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  • Abstract:
    This project investigated the long-term performance of hot asphalt mixes containing crumb rubber

    modifiers (CRM) added in dry or wet processes. A total of eight asphalt mixtures—four Porous

    European Mixtures (PEMs) and four Stone Matrix Asphalts (SMAs)—were designed with PG 76-22

    modified with CRM, which was added in either a dry or wet process. These mixtures were compared to

    control mixtures using an SBS-modified PG 76-22. Mixtures incorporating a “hybrid”-modified PG

    76-22 were also evaluated. First, the samples were weathered in the Georgia Weathering Asphalt Device

    (GWAD) for 1,000 hrs and 3,000 hrs and tested to determine their dynamic modulus, fatigue life,

    rutting, and Cantabro. Binders extracted from the weathered samples were then evaluated using a

    dynamic shear rheometer (DSR), gel-permeable chromatography (GPC), and Fourier transform infrared

    spectroscopy (FTIR). Second, the interactions of dry- and wet-processed CRM with asphalt binder were

    compared during storage and paving. Results indicated: 1) adding TOR to the CRM binder improved

    PG grade and separation resistance; 2) the dynamic modulus, |E*|, of both rubberized PEM and SMA in

    dry process did not differ significantly from that of the control mixtures or mixtures using the “hybrid”-

    modified binders before and after weathering; 3) the fatigue life (Nf) of unaged rubberized PEM and

    SMA in the dry process was similar to that in wet process, although lower than that of control SBS; 4)

    after 3000-hrs aging, the fatigue life of the dry-processed rubberized SMA is similar to that of the

    wet-processed but lower than that of hybrid and SBS SMA, regardless of strain and stress levels or test

    temperatures; 5) the rutting and Cantabro loss of the rubberized PEM and SMA in dry process were

    higher than those of control SBS after weathering; 6) CRM and asphalt binder interact during the

    production and paving stages based on DSR, GPC, FTIR, and AFM results. The effect of weathering on

    the properties of the asphalt binders in rubberized, dry-processed PEMs and SMAs was similar to that in

    the wet-processed mixtures but greater than that in the control SBS.

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