Laboratory evaluation of asphalt concrete mixtures containing high contents of reclaimed asphalt pavement (RAP) and binder.
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2014-11-01
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Abstract:This study investigated the effect of added asphalt
binder content on the performance and volumetric p
roperties of
asphalt concrete mixtures containing reclaimed asph
alt pavement (RAP) in the amounts of 0%, 20%, and 4
0%. A laboratory-
produced mixture containing 100% RAP was also evalu
ated. Performance of the mixtures was evaluated ba
sed on three criteria:
stiffness (dynamic modulus), fatigue resistance, an
d rutting resistance (flow number and asphalt pavem
ent analyzer).
Results showed that a 0.5% increase in binder conte
nt improved both the fatigue and rutting resistance
of the 0% and
20% RAP mixtures with only slight (insignificant) d
ecreases in dynamic modulus. However, the addition
of various amounts of
binder to the 40% RAP mixture led to a significant
decrease in rutting resistance with little or no im
provement to fatigue
resistance. Volumetric analysis was performed on al
l of the mixtures, and detailed results are present
ed.
Based on the results of the study, the authors reco
mmend that the Virginia Department of Transportatio
n supplement
current asphalt mixture design procedures that are
based on mixture volumetric properties with laborat
ory-mixture performance
testing.
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