Investigation of warm-mix asphalt for Iowa roadways.
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Investigation of warm-mix asphalt for Iowa roadways.

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      Phase II of this study further evaluated the performance of plant-produced warm-mix asphalt (WMA) mixes by conducting

      additional mixture performance tests at a broader range of temperatures, adding additional pavements to the study, comparing

      virgin and recovered binder properties, performing pavement condition surveys, and comparing survey data with the Mechanistic

      Empirical Pavement Design Guide (MEPDG) forecast for pavement damage over 20 years of service life. Further objectives

      detailing curing behavior, quality assurance testing, and hybrid technologies were as follows:

       Compare the predicted and observed field performance of existing WMA trials produced in the previous Phase I study to that

      of hot-mix asphalt (HMA) control sections to determine if Phase I conclusions are translating to the field

       Identify any curing effect (and timing of the effect) of WMA mixtures and binders in the field

       Determine how the field-compacted mixture properties and recovered binder properties of WMA compare to those of HMA

      over time for technologies common to Iowa

       Identify the protocols for WMA sample preparation for volumetric and performance testing that best simulate field conditions

      The findings of this study indicate that WMA additives do show statistical differences in mixture properties in some of the mixes

      tested. These differences will not always be statistically different from mixture to mixture. Multiple factors, such as WMA

      additive type, amount of recycled asphalt material, construction conditions, and mixture variability all play a role in determining

      the extent of which WMA and HMA mixes differ. Other significant findings of this study include effects of curing, aging in

      recovered binders from HMA and WMA cores, and the influence of recycled asphalt shingles (RAS) used with WMA. These

      findings will be of interest to owner agencies and contractors utilizing WMA technologies.

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