New Hampshire binder and mix review.
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2012-08-01
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Abstract:This review was initiated to compare relative rut testing and “simple performance tests” (now known as Asphalt Mix ; Performance Tests) for the New Hampshire ½ inch mix with 15% Recycled Asphalt Pavement (RAP). The tested mixes were ; made from various neat and modified asphalt liquids. The asphalts were tested with the full battery of Strategic Highway ; Research Program binder tests to assess stiffness comparisons and low temperature cracking properties. ; Binder testing results indicate that Polyphosphoric Acid (PPA) may slightly decrease the low temperature performance and the ; styrene-butadiene rubber (SBR) modified binder would perform better at low temperatures than the styrene-butadiene styrene ; (SBS) modified binder. With respect to rutting, the Multiple Stress Creep Recovery (MSCR) results indicate the PPA binder ; may increase rutting susceptibility and the SBR modified binder would perform better than the SBS modified binder. ; Mixture testing results indicate the PPA mixture will perform better with respect to rutting, but the Model Mobile Load Simulator ; (MMLS3) tests show the opposite. Air void content differences for the MMLS3 specimens could be affecting the results. The ; difference in fatigue performance will be dependent on the pavement structure. A stiffer mixture is generally better for thicker ; pavements, but may not be for thinner structures.
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Main Document Checksum:urn:sha256:6fd67d0145441b79f48cadb6aa47707c7bc4456b3f69f2ddd2ecb6b3d4949654