Evaluation of crumb rubber modification of Louisiana mixtures : [research project capsule].
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Evaluation of crumb rubber modification of Louisiana mixtures : [research project capsule].

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  • English

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    • Abstract:
      The Louisiana Department of

      Transportation and Development

      (DOTD) has been allowing crumb rubber

      modifi cation (CRM) of asphalt mixtures

      since 2008. Initially, the performance

      of roadways constructed with CRM was

      adequate. The infl uence of CRM on the

      rutting characteristics of the mixture

      provided both performance and economic

      advantages to the public. Crumb rubber

      is typically used at a 10-12% modifi cation

      rate. The modifi cation reduces the

      required bituminous binder content as

      much as 0.5%. CRM stiff ens the asphalt

      binder, resulting in an increased high

      temperature performance grade. The

      reduction in bitumen content and the

      increased performance grade results

      in a mixture with improved rutting

      performance. However, the bitumen

      content reduction may have adverse

      eff ects with regard to cracking and moisture sensitivity. In recent years, the

      durability and cracking resistance of CRM mixtures have been a source of concern.

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