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Construction and monitoring of thin overlay and crack sealant test sections at the Pecos test track.
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2014-10-01
[PDF-2.62 MB]
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Abstract:In this project, several crack sealant sections were constructed at the Pecos RTC. Six different sealants were
applied in routed and non-routed configurations on both older and newer pavement. The following summer,
the sections were revaluated including simulated heavy traffic testing. The sealants were also tested in the lab
with a sealant adhesion test. Also in this this project three different thin overlays were constructed at the test
track, these being the fine-graded permeable friction course, fine stone matrix asphalt and a crack attenuating
mix. The fine PFC used at Pecos was also placed on Loop 338 around Odessa. These new thin overlays and
crack sealant demonstration projects will be evaluated in coming years for future research projects.
The researchers recommend applying more test sections on regularly trafficked pavements using a standard
sealant (TxDOT Class A or B), and the two best performing sealants (AR Plus and Roadsaver 203). These
should be applied to pavements with different levels of traffic and different amounts of crack movement.
The thin overlays first demonstrated in these test section have now become widely used around Texas. They
are now included in the most several specification (SS 3228 and Item 347) and sections have been
constructed in at least half of the Texas Districts
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