Evaluation of crumb rubber in hot mix asphalt.
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Evaluation of crumb rubber in hot mix asphalt.

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  • English

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      Final report; Sept. 2003-July 2004.
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    • Abstract:
      An asphalt-rubber hot mix asphalt (AR-HMA) design was created using a Superpave 12.5mm gradation and a #30 (-) mesh

      crumb rubber at 20% total weight of the asphalt binder. At this point in time, asphalt rubber has only been used with HMA

      that contains a more open graded nature, such as open graded friction course (OGFC). However, OGFC is limited on it use

      due to its potential problems (i.e. clogging and winter maintenance). However, a 12.5mm Superpave mix may be used on

      almost any roadway in New Jersey and is most commonly found as the surface course. It is used for both new construction

      and rehabilitation projects. Therefore, this mix type has the largest potential for usage, meaning that more tires can

      eventually be recycled. However, two factors need to be considered prior to acceptance; performance and cost.

      Four HMA mixes were constructed and tested in this study. Three baseline mixes using a PG64-22, PG70-22, and a PG76-

      22 asphalt binder, as well as the AR-HMA mix which used crumb rubber blended with the same PG64-22 asphalt binder.

      The influence of crumb rubber particle size on the compaction properties during the mixture design procedure was also

      evaluated. This would provide a method of comparing the final mixture performance of different performance graded

      binders to the AR-HMA mix. This type of methodology of testing the mixtures is extremely important due to the necessity

      of ensuring the crumb rubber complying to the aggregate gradation volume limitations, and how the crumb rubber interacts

      with this volume limitation under performance testing. Therefore, a number of different performance tests were conducted

      on the four different HMA mixes: 1) Asphalt Pavement Analyzer, 2) Repeated Load Permanent Deformation testing using

      the Simple Performance test specifications, 3) Dynamic Modulus, 4) Repeated Shear at Constant Height, 5) Frequency

      Sweep at Constant Height,and 6) Simple Shear at Constant Height.

      The results from the mixture design portion concluded that to provide consistent compactibility when using crumb rubber in

      a 12.5mm Superpave design, the maximum particle size should not be greater than a #30 mesh. The performance tests

      concluded that the AR-HMA mix performed as well as or better than the PG76-22 for every test conducted. For example,

      the dynamic modulus test results showed that the AR-HMA had similar stiffnesses to the PG76-22 at the high test

      temperatures, however, the AR-HMA had a much less stiffness at the low test temperature. This indicates that the ARHMA

      mix design in this study will provide excellent rut resistance, while also providing excellent low temperature cracking

      resistance. Essentially, by adding the crumb rubber to the PG64-22, the working temperature range of the asphalt binder

      increased on both the high and low sides. Also, by performing similarily to the PG76-22, Bayshore Recycling now can

      establish a cost comparison using the difference in cost between a HMA with a PG64-22 and a PG76-22.

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