Asphalt mixture cold temperature performance using the Bending Beam Rheometer (BBR).
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Asphalt mixture cold temperature performance using the Bending Beam Rheometer (BBR).

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  • Abstract:
    The use of recycled materials providing substitution of virgin binder in asphalt mixtures

    continues to increase. The current level of funding for highway construction is

    significantly less than 3 years ago and the level of competition between bidders is fierce.

    With the increased substitution of virgin binders, concern for cold weather performance

    of the mixtures has also increased. The binder in reclaimed asphalt pavement (RAP) is

    usually somewhat stiffer and the binder in reclaimed asphalt shingles (RAS) is

    remarkably stiffer than the virgin roadway binders. Extraction and recovery of the

    binders to determine the binder characteristics results in 100% blending of the binders,

    however, the actual amount of blending between the recycled and virgin binders in the

    mixtures is unknown. While estimates of the blended binder can be conjectured, it is

    believed that performance testing of the mixture is the best way to predict how the

    mixture will perform on the roadway. Cold temperature performance of the mixtures is

    not typically an evaluation made by MoDOT due to the complexity and cost for test

    equipment, preparation of test specimens and evaluation of the test results. However, one

    test was found that could be completed using the bending beam rheometer (BBR)

    currently in MoDOT’s Central Laboratory.

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