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Recycled Tire Rubber – Hybrid GTR Binders and Dry Added GTR – How to use them in Asphalt Pavement Mixtures.
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Addition of ground tire rubber (GTR) to asphalt binder and mixture is an asphalt mixture practice in asphalt production that consumes about 16.5 percent of the total ground tire rubber (GTR) market today. Modification of asphalt binders and mixtures with GTR is well established and can provide high performance pavements that aid in reduction of the number of waste tires disposed of in landfills and elsewhere. Dense-graded asphalt (DGA), stone-matrix asphalt (SMA) and open-graded friction course (OGFC) with asphalt rubber (AR), terminal blend rubber modified binder (RMB), hybrid GTR, and dry addition of GTR can be designed with standard Marshall, Hveem, and Superpave mixture design methods. This report presents a review and update of the various mixture design processes for use in designing DGA, SMA, and OGFC mixtures with RMB, hybrid GTR, and dry added GTR in production of asphalt pavements. The objective is to provide knowledge for resource responsible use of RMB, hybrid GTR, and dry added GTR to ensure engineering performance in asphalt pavements and inform environmental benefits through life cycle assessment. The scope of this report is limited to use of GTR from whole scrap tires through size reduction and grinding to the particle size range defined by industry as GTR. The report includes information related to design of DGA, SMA, and OGFC mixtures using RMB, hybrid GTR, and dry added GTR and testing of mixtures containing GTR-modified asphalt binders, as well as additional considerations for GTR-modified asphalt mixture designs.
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