The main objective of this project is to quantify and resolve
the differences in the longitudinal profile and roughness indices
that are attributable to the different profiling equipment that
have been used in the LTPP program. The Long-Term Pavement
Performance (LTPP) program was designed as a 20-year study of
pavement performance. A major data collection effort at LTPP test
sections is the collection of longitudinal profile data using
inertial profilers. Three types of inertial profilers have been
used since the inception of the LTPP program: (1) K.J. Law
Engineers DNC 690 incandescent profilers, (2) K.J. Law Engineers
T-6600 infrared-system profilers, and (3) ICC laser profilers. The
following analyses were performed for this research project: (1)
investigate data collection characteristics and compare profile
data collected by the different inertial profilers, (2) compare
International Roughness Index (IRI) values obtained by the
different inertial profilers, (3) investigate factors that
contribute to differences in IRI for data obtained from profilers
and Dipstick®, and (4) identify problems with equipment
functionality and current data collection and processing
procedures. The analysis indicated good agreement of IRI values
among the different inertial profilers that have been used in the
LTPP program.
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This document is disseminated under the sponsorship of the U.S.
Department of Transportation in the interest of information
exchange. The U.S. Government assumes no liability for its contents
or use thereof. This report does not constitute a standard,
specification, or regulation.
The U.S. Government does not endorse products or manufacturers.
Trade and manufacturers' names appear in this report only because
they are considered essential to the object of the document.
Quality Assurance Statement
The Federal Highway Administration (FHWA) provides high-quality
information to serve Government, industry, and the public in a
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1. Report No.
FHWA–HRT–05–054
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2. Government Accession No.
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3. Recipient's Catalog No.
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4. Title and Subtitle
Quantification of Smoothness Index Differences Related To
Long-Term Pavement Performance Equipment Type
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5. Report Date
September 2005
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6. Performing Organization Code
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7. Author(s)
R.W. Perera and S.D. Kohn
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8. Performing Organization Report No.
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9. Performing Organization Name and Address
Soil and Materials Engineers, Inc.
43980 Plymouth Oaks Blvd.
Plymouth, MI 48170
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10. Work Unit No. (TRAIS)
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11. Contract or Grant No.
DTFH61-96-C-00030
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12. Sponsoring Agency's Name and Address
Office of Infrastructure Research, Development, and
Technology
Office of Infrastructure R&D
Federal Highway Administration
6300 Georgetown Pike
McLean, VA 22101
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13. Type of Report and Period Covered
Final Report
January–December 2004
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14. Sponsoring Agency's Code
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15. Supplementary Notes
Contracting Officer's Technical Representative (COTR): Larry
Wiser, HRDI-13.
This research was conducted in collaboration with the University of
Michigan Transportation Research
Institute (UMTRI) through participation and contributions from
Steven Karamihas. Work was
performed as a subcontract to Construction Technology Laboratories,
Inc. (CTL), Columbia, MD.
Dr. Shiraz Tayabji served as the project manager for the CTL
contract.
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16. Abstract
The Long-Term Pavement Performance (LTPP) program was designed
as a 20-year study of pavement performance. A major data collection
effort at LTPP test sections is the collection of longitudinal
profile data using inertial profilers. Three types of inertial
profilers have been used since the inception of the LTPP program:
(1) K.J. Law Engineers DNC 690 incandescent profilers, (2) K.J. Law
Engineers T-6600 infrared-system profilers, and (3) International
Cybernetics Corporation (ICC) laser profilers. The following
analyses were performed for this research project: (1) investigate
data collection characteristics and compare profile data collected
by the different inertial profilers, (2) compare International
Roughness Index (IRI) values obtained by the different inertial
profilers, (3) investigate factors that contribute to differences
in IRI for data obtained from profilers and Dipstick®, and (4)
identify problems with equipment functionality and current data
collection and processing procedures. The analyses indicated good
agreement of IRI values among the different inertial profilers that
have been used in the LTPP program.
|
17. Key Words
IRI, inertial profilers, Dipstick, pavement data collection,
pavement profile, profile measurement, profiler, LTPP.
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18. Distribution Statement
No restrictions. This document is available to the public
through the National Technical Information Service, Springfield, VA
22161.
|
19. Security Classif. (of this report)
Unclassified
|
20. Security Classif. (of this page)
Unclassified
|
21. No. of Pages
157
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22. Price
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AC |
Asphalt Concrete |
ANOVA |
Analysis of Variance |
ARRB |
Australian Road Research Board |
DMI |
Distance Measuring Instrument |
DOT |
Department of Transportation |
FHWA |
Federal Highway Administration |
GPS |
General Pavement Studies |
ICC |
International Cybernetics Corporation |
IRI |
International Roughness Index |
LTPP |
Long-Term Pavement Performance |
Mn/DOT |
Minnesota Department of Transportation |
Mn/ROAD |
Minnesota Road Research Project |
NCHRP |
National Cooperative Highway Research Program |
PCC |
Portland Cement Concrete |
PSD |
Power Spectral Density |
RMSVA |
Root Mean Square Vertical Acceleration |
RN |
Ride Number |
RSC |
Regional Support Contractor |
SHRP |
Strategic Highway Research Program |
SPS |
Specific Pavement Studies |
TxDOT |
Texas Department of Transportation |
UMTRI |
University of Michigan Transportation Research Institute |