Pavement Preservation Journal - Spring 2018 - 11

New NCHRP Guidance Targets
Pavement Preservation Performance

T

wo new National Cooperative
Highway Research program
(NCHRP) reports released late
last year target pavement preservation operations and provide a powerful
resource for agencies and contractors in the
preservation arena. In addition, another
NCHRP report involving pavement preservation nears release.
Here's a look at what the industry can
learn from these reports, how they may
impact operations, and where to download
copies at no charge.
PERFORMANCE SPECS
NCHRP Report 857: Performance-Related
Specifications for Pavement Preservation
Treatments was released in 2017 and
frames the drift toward performance specs
in preservation.
NCHRP 857 was written by Karim Chatti,
Syed Waqar Haider, Ronell J. Eisma,
Gopikrishna Musunuru, Michigan State
University, East Lansing; and Y. Richard Kim,
Cassie Castorena and Javon Adams, North
Carolina State University Raleigh.
The report presents guidelines for preparing performance-related specifications
(PRS) for pavement preservation treatments
and, if desired, determining pay adjustment factors, and illustrates the applicability of these guidelines for selected
preservation treatments for flexible and
rigid pavements.
The guidelines follow a systematic
process that considers acceptance quality characteristics and performance measures for preservation treatments. The
report will be especially interesting to
state materials and maintenance engineers,
and any others involved with the specification and quality aspects of pavement
preservation treatments.
"Quality assurance specifications that
specify end-product quality have often
been used by transportation agencies as a
means for ensuring construction quality of
highway pavements," says Amir N. Hanna,
staff officer, Transportation Research Board.

"However, agencies are increasingly incorporating performance related specifications
in construction contracts...[a]lthough such
PRS have been used for the construction of
pavements, their use for pavement preservation treatments has been limited."
There are no widely accepted guidelines
for PRS for pavement preservation treatments that correlate key engineering properties to treatment quality and long-term
performance. Therefore, research was
needed to address the issues associated
with PRS and to develop guidelines for
use in preparing rational PRS for pavement
preservation treatments.
"These guidelines will help highway
agencies develop and incorporate PRS in
preservation treatment contracts, specify
an optimum level of quality that represents
a balance of costs and performance, and,
if desired, establish quality-related pay
adjustment factors," Hanna writes.
The objective of the research was to
develop guidelines for use in preparing
pavement related specs for both flexible
and rigid pavement preservation treatments. Preservation treatments are defined
as actions applied to preserve an existing
roadway, slow future deterioration, and
maintain and improve roadway functional
condition (without substantially increasing structural capacity). Preventive maintenance treatments commonly applied to
hot-mix asphalt (HMA) pavements include
crack sealing and crack filling, slurry seals,
chip seals, micro surfacing, cape seal,
fog seals, hot in-place recycling (HIR),
cold in-place recycling (CIR), and thin
HMA overlays.
Treatments applied to portland cement
concrete (PCC) pavements include joint
resealing, crack sealing, joint and spall
partial-depth repair, load-transfer restoration, diamond grinding, and under-sealing.
"Performance specifications define the
requirements of the end product, thus
allowing the contractor to select materials
and construction techniques suitable for
meeting the requirements," NCHRP 857

says. Performance specifications can be
classified into the following types:
* End-result specifications (ERS)
* Quality assurance specifications (QAS)
* Performance-based specifications (PBS)
* Performance-related specifications (PRS)
* Warranties, and
* Long-term maintenance provisions.
Guidelines for developing PRS for pavement preservation treatments will differ
from those for rehabilitation and reconstruction of flexible and rigid pavements,
NCHRP 857 says:
* Preservation treatment performance is
greatly influenced by the pre-existing
pavement conditions with respect
to both structural capacity and
functional condition.
* Given that preservation treatments are
non-structural fixes, different performance measures should be considered
for their functional performance evaluations. For example, texture, raveling,
flushing, bleeding and weathering are a
few important indicators of performance
for preservation treatments.
* The construction materials used in
preservation treatments can differ from
conventional pavement materials. For
example, most of the preservation treatments for flexible pavements use asphalt
Spring 2018 | PAVEMENT PRESERVATION JOURNAL

11



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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