Pavement Preservation Journal - Spring 2018 - 21

Oklahoma: High-Friction Surface
Treatments Perform on Interstates

P

reliminary results from the
Oklahoma Department of
Transportation's first two
high-friction surface treatment
projects on rural, low-traffic roads were
promising. But the agency wanted to evaluate the technology on pavements with high
traffic volumes.
In response, an Accelerated Innovation
Deployment Demonstration award from the
Federal Highway Administration (FHWA)
enabled the Oklahoma DOT to gain experience applying HFST pavement overlay
systems with exceptional skid resistance
on interstates.

*

PROJECT PURPOSE
The 2015 project, documented in a report,
HFST in the Oklahoma City Metropolitan
Area, involved using HFSTs on three-lane
curves at three locations on I-40 and I-44
in Oklahoma City. The project's purpose
was twofold:
* Demonstrate the installation and service life of the technology at high-traffic
locations, and
* Improve safety on the curves by providing increased pavement friction to help
motorists maintain better control, and
reducing roadway departure crashes,
injuries and fatalities.
The Oklahoma DOT based its choice of
sites for HFST application on crash experience and pavement condition. The entire
application was done using an automated
process. Because of the traffic volumes
at the three locations, work was done
at off-peak travel times and on weekends. Only one lane at a time was closed,
except when crews applied HFSTs to the
center lanes.

HIGH SKID NUMBERS
The Oklahoma DOT planned to collect
crash, friction and skid data at the project
sites for at least three years to evaluate the
safety impacts of applying HFSTs.
Initial skid numbers for the completed project were high at 80 to 84, a
substantial improvement over preconstruction skid numbers ranging from
31 to 36. Friction numbers also showed
significant improvement.
"The Oklahoma DOT determined
from the preliminary results of our data
analysis that installation of HFST on
multilane high-volume highways is practicable and that dramatically improved
friction numbers can be achieved," the
agency said in its report. "Pending longer term data analysis, we propose
adopting the use of HFST on multi-lane
high volume highways into our standard
operating procedures."
Using experience gained on the project,
the Oklahoma DOT is developing HFST standards and initiating a program to apply the
technology to a number of selected curves
each year.
Download the Oklahoma DOT report at
www.fhwa.dot.gov/innovation/grants/
projects/ok_2014_report.pdf

WHAT OKLAHOMA LEARNED
Through this project, the Oklahoma DOT
gained valuable insights with regard to
the innovative construction method used.
Following are some of the lessons learned:
* Sealing cracks in the pavement prior
to the application of the HFST may be

*

*

*

*

*

counterproductive. It is known from earlier
HFST installations on S.R. 20 in Oklahoma
that the epoxy will not adhere to the fog
seal if a crack is overfilled, leaving gaps
in coverage. On the sites for this project,
cracks were not sealed. No deleterious
effect on the performance of the HFST
due to the cracks could be detected.
In spite of using a fully automated system to apply the HFST, some manual
work had to be done to at least one site
to correct for interference with the distribution of both epoxy and aggregate
by wind. The use of wind guides should
be specified for fully automated HFST
application, but this alone might not be
sufficient to ensure proper application.
Application of HFSTs to concrete pavement presented no difficulties or deficiencies, although water blasting was
required to prepare the surface.
Oklahoma DOT lacked an acceptance process for qualification of the
epoxy binder.
Existing lane striping was covered by the
HFST and flex tabs were used for weeks
after installation. At the Air Depot/29th St.
site, the flex tabs did not remain in place as
well as desired. Leaving existing striping
in place and uncovered by the HFST might
be a preferable option.

At the Airport Road site, loose aggregate remained on the shoulder after
installation. Vacuuming followed by
sweeping, of the entire paved width,
was therefore recommended for this
type of application.
To work on the center lane of these
sites, it was necessary to close two lanes
at a time. Even at off-peak times, severe
congestion resulted and at one location
the queue reached at least six miles
in length, with traffic backing up onto
adjoining city streets for unknown distances. In the future it may be desirable
to allow work only at night.

Adapted by Pavement Preservation Journal
from the Oklahoma DOT and FHWA reports
Spring 2018 | PAVEMENT PRESERVATION JOURNAL

21


http://www.fhwa.dot.gov

Table of Contents for the Digital Edition of Pavement Preservation Journal - Spring 2018

President’s Message
New NCHRP Guidance Targets Pavement Preservation Performance
Florida Tackles Premature Failures of High Friction Surface Treatments
Oklahoma: High-Friction Surface Treatments Perform on Interstates
NCAT Track Conference Will Provide Look at Pavement Preservation Sections
FP2@TRB 2018
Bi-Partisan ‘problem Solvers Caucus’ Works to Move Infrastructure Reform
Research: Longitudinally Textured PCC Pavement Most Energy-Efficient Surface
Not Just Pavements: Micro Surfacing Right for New York’s Brooklyn Bridge
Profiles in Preservation: Crack Sealants
Index of Advertisers
Pavement Preservation Journal - Spring 2018 - Intro
Pavement Preservation Journal - Spring 2018 - cover1
Pavement Preservation Journal - Spring 2018 - cover2
Pavement Preservation Journal - Spring 2018 - 3
Pavement Preservation Journal - Spring 2018 - 4
Pavement Preservation Journal - Spring 2018 - 5
Pavement Preservation Journal - Spring 2018 - 6
Pavement Preservation Journal - Spring 2018 - 7
Pavement Preservation Journal - Spring 2018 - 8
Pavement Preservation Journal - Spring 2018 - President’s Message
Pavement Preservation Journal - Spring 2018 - 10
Pavement Preservation Journal - Spring 2018 - New NCHRP Guidance Targets Pavement Preservation Performance
Pavement Preservation Journal - Spring 2018 - 12
Pavement Preservation Journal - Spring 2018 - 13
Pavement Preservation Journal - Spring 2018 - 14
Pavement Preservation Journal - Spring 2018 - Florida Tackles Premature Failures of High Friction Surface Treatments
Pavement Preservation Journal - Spring 2018 - 16
Pavement Preservation Journal - Spring 2018 - 17
Pavement Preservation Journal - Spring 2018 - 18
Pavement Preservation Journal - Spring 2018 - 19
Pavement Preservation Journal - Spring 2018 - 20
Pavement Preservation Journal - Spring 2018 - Oklahoma: High-Friction Surface Treatments Perform on Interstates
Pavement Preservation Journal - Spring 2018 - 22
Pavement Preservation Journal - Spring 2018 - 23
Pavement Preservation Journal - Spring 2018 - 24
Pavement Preservation Journal - Spring 2018 - NCAT Track Conference Will Provide Look at Pavement Preservation Sections
Pavement Preservation Journal - Spring 2018 - FP2@TRB 2018
Pavement Preservation Journal - Spring 2018 - 27
Pavement Preservation Journal - Spring 2018 - 28
Pavement Preservation Journal - Spring 2018 - Bi-Partisan ‘problem Solvers Caucus’ Works to Move Infrastructure Reform
Pavement Preservation Journal - Spring 2018 - 30
Pavement Preservation Journal - Spring 2018 - Research: Longitudinally Textured PCC Pavement Most Energy-Efficient Surface
Pavement Preservation Journal - Spring 2018 - 32
Pavement Preservation Journal - Spring 2018 - 33
Pavement Preservation Journal - Spring 2018 - 34
Pavement Preservation Journal - Spring 2018 - 35
Pavement Preservation Journal - Spring 2018 - Not Just Pavements: Micro Surfacing Right for New York’s Brooklyn Bridge
Pavement Preservation Journal - Spring 2018 - 37
Pavement Preservation Journal - Spring 2018 - 38
Pavement Preservation Journal - Spring 2018 - Profiles in Preservation: Crack Sealants
Pavement Preservation Journal - Spring 2018 - 40
Pavement Preservation Journal - Spring 2018 - Index of Advertisers
Pavement Preservation Journal - Spring 2018 - 42
Pavement Preservation Journal - Spring 2018 - cover3
Pavement Preservation Journal - Spring 2018 - cover4
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