Evaluation of crumb rubber modification of Louisiana mixtures : [research project capsule].
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2015-11-01
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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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