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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      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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