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(upbeat jingle)

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- [Narrator] As some concrete pavements

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near the end of their design lives,

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the Texas Department of
Transportation is looking at future

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cost-effective rehab
programs for those roadways.

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Working with the Center
for Multidisciplinary

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Research and Transportation,
TechMRT looks to train staff

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that will evaluate existing pavement

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and develop overly strategies

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when replacement becomes necessary.

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- Texas has many, many miles

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of jointed to the concrete pavement.

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Some of them are very old, so
they need some rehabilitation,

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but unfortunately we don't
really have a good rehab options

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for those old concrete pavement.

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- We wanted a rehab strategy
to be able to determine

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if an overlay was an acceptable method

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for that particular section
that was having distress.

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So one of the concepts we came up with

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was putting a CRC overlay on top

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of some of these jointed pavements.

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- [Moon] We really needed an optimum.

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We have option for
jointed concrete pavement

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that led to the development
of this research project.

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- [Andy] We actually constructed a overlay

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of that type of CRC on top of
a jointed concrete pavement.

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- [Moon] We found out
that the quality control

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during the construction is very important.

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- [Andy] Like surface prep
of the existing pavement,

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so that way we get adequate
bond of the overlay.

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And then just the things for mix design.

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You know, what mix
design should we be using

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in terms of the concrete.

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We learned a lot of aspects
in terms of what would promote

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long-term performance of the
overlay in particular project.

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- [Moon] This was an
implementation project in Paris.

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So it was around, what,
nine 10th of a mile project?

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- [Andy] So the researchers
went through the design process

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and worked with the district, say,

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"For that section, let's build
a five inch thick overlay

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on top of your pavement."

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And then so they did that.

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We led the project, it was awarded,

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and then the contractor
recently finished it last year.

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But it was all an actual
construction project

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to show that the implementation

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of the design concept does work.

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- The future plan is that we will monitor

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the performance of this pavement section

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under the ongoing Digital
Pavement Database project.

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- It's in terms of a cost savings,

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because now instead of a
complete reconstruction

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of a fairly distressed pavement,

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we have to tear up the whole road,

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close it down for an
extended period of time

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to redo a complete re reconstruction.

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We could do it in phases now.

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We could keep traffic open,
do the overlay on one side,

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switch traffic over, do the
overlay on the other side,

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and then we have a brand
new pavement surface.

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So saves time for disruption
for the traveling public,

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and also saves cost
because a five inch overlay

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is definitely a lot cheaper

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than going full death reconstruction

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of maybe a 14 inch thick
pavement structure now.

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So in terms of of cost,

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it's definitely a cost saving
rehabilitation strategy.

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- [Narrator] For more information

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and to find the publication
for this project,

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please visit the TxDOT Research Library

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at the link shown below.