Spray Applied Polymer Surface Seals - TSP2

Lessons Learned
Core Slice Binder & Mix Rheology
Conclusions:
• Rejuvenators soften AC near surface only if
permeability is sufficient to allow infiltration.
• Fog seal products with harder residues do
not soften aged AC significantly, but can
reduce pavement permeability enough to
delay moisture intrusion.
These results seemed puzzling until lab permeability results for this pavement were
found to be essentially zero. Clearly, rejuvenator oils could not infiltrate to soften
oxidized asphalt near the surface. Only direct mixture testing could accurately
characterize the mixture in the zone where block crack initiation is likely to occur.
Fortunately, results for rejuvenator seals applied to the more permeable Arizona
dense mix were much more in line with expectations that rejuvenator seals can
soften aged asphalt. Here, the Reclamite rejuvenator emulsion did soften the
pavement surface layer as would have been predicted by the binder extraction. In
fact, the rejuvenated binder was even softer than the second thin pavement layer in
both cases. As expected, the harder emulsion residues in the sealer products had
much less impact on the rheology of the surface layer, although they do appear to
help retard oxidation when applied to the right pavements at the right time.
87