Pavement Preservation Journal - Spring 2018 - 14

Florida Tackles Premature Failures
of High Friction Surface Treatments

F

IMAGE CREDIT: FLORIDA DOT

lorida has tackled occasional premature failures of high friction
surface treatments with a new
specification and guidebook for
use in the Sunshine State.
The State of Florida has used high friction surface treatments (HFSTs) since
2006 to reduce wet weather crashes
on tight curves and intersections and to
maintain bridge decks, say Bryan Wilson
and Anol Mukhopadhyay, Ph.D., associate
research scientists, Texas A&M Transportation
Institute, in their 2016 technical guidance,
Alternative Aggregates and Materials for High
Friction Surface Treatments. However, Florida
DOT has reported issues related to premature
failure of the treatment.
Produced in cooperation with the Florida
DOT and Federal Highway Administration,
Alternative Aggregates and Materials
included:
* Review of the literature and interviews
with industry experts on the state of the
practice of HFSTs
* Documentation of all existing HFST projects in Florida with analysis of their

Aggregate loss over uneven texture
14

*

*

*

performance based on distress, skid
resistance, and crash reduction
Performance of field testing on six projects, evaluating their present performance and conducting forensic analyses
as needed
Performance of lab tests on different
aspects of HFST materials and construction practices to improve durability and
reduce costs; and
Development of a revised HFST specification for Florida and an HFST
Guidelines brochure.

HFSTS SUCCESSFUL SINCE 2006
Despite their success since 2006, various
sections of HFST have experienced severe
cracking and potholing of the pavement,
delamination from the existing surface, and
raveling of the aggregate from the resin
binder, the authors say. Another issue with
HFST is that the high material costs limit
the number of sections that can be treated
annually. "Consequently, there is a need
to research the best materials and practices to eliminate premature HFST failures

and reduce overall HFST costs, while
maintaining or improving treatment life
and friction performance," Wilson and
Mukhopadhyay say.
Project documentation and field testing indicated the bid unit cost of HFST in
Florida was between $26 and $40/yd2, and
the total unit cost (including traffic control,
repairs, striping, etc.) was between $36
and $113/yd2.
They discovered:
* Crash reduction from HFSTs was most
effective on tight curves, where the
average reduction in crash rate was
32 and 75 percent for total and wet
weather crashes, respectively. Crash
rates did not notably change on wide
curves/tangent but increased on average
for intersections/approach.
* HFSTs are a cost-effective treatment for
tight curves with a history of crashes.
The average benefit-cost (BC) ratio on
tight curves with a history of crashes
was between 18 and 26 (depending on
calculation method), with some sections
greater than 50 and as high as 118.
* HFSTs are not cost effective, from a crash
reduction perspective, on wide curves/
tangents with no history of crashes. The
cost effectiveness for bridge deck preservation was not part of this research.
* The cost effectiveness of HFST at intersections/approaches is still inconclusive. Half the observed sections had
good BC ratios, while the other half had
increased crashes.
* Different distress types were observed in
the field (potholing, aggregate loss, surface cracking, substrate tearing, splotchy
texture). Through forensic evaluation,
several of the failure mechanisms were
identified as discussed in the background section.
Highlighted research findings form the
laboratory testing include:
* Aggregate loss is a function of binder
thickness, where aggregate loss greatly
increased for binder thicknesses less
than 50 mils.

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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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