Pavement Preservation Journal - Spring 2018 - 17

RECOMMENDATIONS
Based on these and other findings,
Wilson and Mukhopadhyay recommend
the following:
Candidate Projects. The researchers
recommend that agencies strongly consider
applying HFST on tight crash-prone curves.
Agencies should carefully consider if HFST
would be effective at reducing crashes at
intersection approaches and within intersections (i.e., identify if a significant source
of accidents is skid related).
When applied on wide curves and
tangent sections (i.e., for maintenance of
bridge decks), agencies should not expect
to see significant economic benefits from
crash reduction; however, benefits from
pavement preservation may warrant
the cost.
As concerns the existing surface type,
the researchers do not recommend placing HFST on open graded friction course
(OGFC) pavements. While some projects
have successful performance over OGFC,
the material often causes more problems
like excessive draindown, requirement of
double-lift HFST, substrate cracking, and
stripping. These surfaces should be milled
out and inlaid with dense-graded mix prior
to applying HFST.
The department may consider a minimum substrate strength requirement, but
stricter requirements on the existing surface type and distress condition should
resolve issues with substrate failure. The
researchers don't recommend excessively
stringent requirements on surface condition, as it could unnecessarily drive up the
costs of HFST application with marginal
benefits to long-term performance.
Materials. The two calcined bauxite
sources evaluated in this research are
acceptable for HFST. The researchers recommend lowering the minimum required
Al2O3 content for calcined bauxite to
86 percent. The minimum required content could likely be lowered further with
negligible effect to performance; however,
the data are not yet available to support
this decision. The unknown aggregate type
tested in this research may be suited for
bridge-deck preservation.
The current specification for polymer
resin binders is adequate. In the future, the
department may consider a specification
with greater flexibility to mitigate problems

with thermal incompatibility. This change
would need to be balanced with the binder
strength and hardness.
An alternative approach to HFST could
be incorporating calcined bauxite into HMA
design. While a successful design can be
created, it is likely an infeasible option considering the economics of producing and
constructing such small quantities. It may
only be feasible if paving a winding rural
road. Even then, the friction performance
of this design is inferior to HFST.

Construction. The researchers recommend a contractor requirement to place an
HFST test section before full-scale application. This gives the contractor a chance
to identify and fix problems, and of equal
importance, the Florida DOT inspector will
become familiar with the process and
potential issues.
Surface preparation of all projects should
include a high-pressure air wash after
sweeping to remove remaining dust and
debris. Concrete surfaces should require

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Spring 2018 | PAVEMENT PRESERVATION JOURNAL

17

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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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