Design and Analysis Procedures for Asphalt Mixtures Containing High RAP Contents and/or RAS
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2021-04-01
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Edition:Final Report Enter Date: 11/2014 – 10/2019
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Abstract:Asphalt recycling has been implemented as a cost-effective and environmentally friendly technique in pavement construction activities. Currently, the most widely used recycled asphalts are contributed from reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS). In order to accommodate the recycled asphalts that are oxidatively aged, techniques such as warm-mix asphalt (WMA) processes and use of soft base binder have proven effective to attain the desired performance. With the increasing complexity in material composition, however, the design of asphalt mixtures has relied on the Superpave method, which is based on volumetric principles and is not directly related to performance. Mechanistic performance testing is needed to complement the Superpave approach that was originally developed for virgin materials. The objectives of this research project were to: (1) assess the impact of RAP/RAS binders on the chemical and rheological properties of their blends with virgin binders in relation to cracking resistance; (2) evaluate the asphalt mixture cracking resistance using a variety of testing methods; and (3) compare the mixture testing methods by developing a comprehensive score card system to provide a guideline for selecting the optimum testing methods.
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