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- W1601750423 abstract "According to the Superpave mixture design procedures, specimens are mixed and compacted at equiviscous binder temperatures corresponding to viscosities of 0.17 and 0.28 Pa.s, respectively. These were the values previously used in the Marshall mix design method to determine the mixing and compaction temperatures. In order to estimate the appropriate mixing and compaction temperatures for Superpave mixture design, a temperature-viscosity relationship for the binder should be developed (ASTM D2493, Calculation of Mixing and Compaction Temperatures.) This approach is simple and provides reasonable temperatures for unmodified binders. However, some modified binders have exhibited unreasonably high temperatures for mixing and compaction using this technique. These high temperatures could result in construction problems, damage of asphalt, and production of fumes. ASTM D2493 was established for unmodified asphalt binders, which behave similar to Newtonian fluids at high temperatures. For these materials, viscosity does not depend on shear rate. However, some modified asphalt binders exhibit a phenomenon known as pseudoplasticity, where viscosity depends on shear rate. Thus at the high shear rates that occur during mixing and compaction it may not be necessary to use very high temperatures. A research study was undertaken to determine the shear rate during compaction such that the effects of this parameter could be included during viscosity measurements. The use of shear rates experienced by the binders during compaction results in reasonable mixing and compaction temperatures for hot mix asphalt with modified asphalt binders. It was found that application of the share rate concept rather than traditional approach used for unmodified binders can reduce the mixing and compaction temperatures between roughly 10 to 30 degrees C, depending on the type and the amount of the modifier." @default.
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- W1601750423 date "2000-12-01" @default.
- W1601750423 modified "2023-10-01" @default.
- W1601750423 title "MIXING AND COMPACTION TEMPERATURES FOR SUPERPAVE MIXES" @default.
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