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Publication Number: FHWA-RD-03-040
Date: July 2002
This guide summarized the layer material type and thickness data structure in the Long-Term Pavement Performance (LTPP) database. Summaries of layer thickness within-section data variablility and constructed thickness deviations from the target thickness are also provided for LTPP sections; the guide provides several benchmark values for both of these data elements for different material types. Guidelines are also presented to search for the most appropriate thickness information for different research purposes.
This guide will be of interest to highway agency engineers and reearchers involved in pavement design, performance modeling, and construction quality assurance.
T. Paul Teng, P.E.
This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government asumes no liability for its contents or use thereof. The report does not constitute a standard, specificiation, or regulation.
The United States Government does not endorse products or manufacturers. Trade or manufacturers' names appear herein only because they are considered essential to the objective of the document.
Technical Report Documentation Page
Technical Report Documentation Page
|1. Report No.
|2. Government Accession No.||3. Recipient's Catalog No.|
4. Title and Subtitle
|5. Report Date July 30, 2002|
|6. Performing Organization|
Y. Jane Jiang, Olga I. Selezneva, and Goran Mladenovic
|8. Performing Organization Report No.
|9. Performing Organization Name and Address
ERES Division of Applied Research Associates, Inc.
9030 Red Branch Road, Suite 210
Columbia, Maryland 21045
|10. Work Unit No.|
|11. Contract or Grant No.
|12. Sponsoring Agency Name
Office of Infrastructure Research and Development
Federal Highway Administration
6300 Georgetown Pike
McLean, Virginia 22101-2296
|13. Type of Report and Period Covered
|14. Sponsoring Agency Code|
|15. Supplementary Notes
Contracting Officer's Technical Representative (COTR): Cheryl Allen Richter, HRDI
Work was conducted as part of the LTPP Data Analysis Technical Support Contract.
Field sampling, materials testing, and other layer thickness data collection activities utilized by LTPP are discussed, along with the characterization of the within-sectin thickness variation and designed versus constructed thickness data variations for the LTPP sections. Findings from this study are applicable to pavement design reliability and construction quality assurance applications.
|17. Key Words
Asphalt pavements, concrete pavements, LTPP, layer thickness, thickness variation, sampling
|18. Distribution Statement
No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161.
|19. Security Classif. (of this report)
|20. Security Classif. (of this page)
|21. No. of Pages
Table 1. Code list and code descriptions for "DESCRIPTION."
Table 2. Code list and code descriptions for code "MAT_TYPE."
Table 3. Code list and code descriptions for code "VISUAL_ACPC."
Table 4. Code list and code descriptions for code "COMMENT."
Table 5. Sampling requirements for visual examination and thickness of AC cores.
Table 6. Detailed SPS sampling requirements for visual examination and thickness of AC cores.
Table 7. Summary of the sampling and testing plan for thickness measurement and visual examination of PCC cores.
Table 8. Detailed SPS sampling requirements for PCC core visual examination and length measurement.
Table 9. Code list and code descriptions for code "MATERIAL."
Table 10. Code list and code descriptions for code "LAYER_TYPE."
Table 11. Code list and code descriptions for code "MEASURE_TYPE."
Table 12. Code list and code descriptions for code "L05B_COMMENT_CODES."
Table 13. Summary of layer thickness COV and standard deviations based on core measurements.
Table 14. Summary of layer thickness COV and standard deviations based on SPS elevation measurements.
Table 15. Design layer thicknesses for the SPS-1 experiment.
Table 16. Design layer thicknesses for the SPS-2 experiment.
Table 17. Design layer thicknesses for the SPS-5 experiment.
Table 18. Design layer thicknesses for the SPS-6 experiment.
Table 19. Design layer thicknesses for the SPS-7 experiment.
Table 20. Design layer thicknesses for the SPS-8 experiment.
Table 21. Summary of differences between mean elevation thickness measurements and target thicknesses.
Table 22. Summary of differences between mean core thickness measurements and target thicknesses.
Table 23. Distribution of the mean thickness deviations from the design thickness based on kurtosis and skewness tests.
Figure 1: Chart. Example distribution of layer thickness measurements along the section for AC surface and binder layer for the SPS-1 Section 55-0118.
Figure 2: Chart. Example distribution of layer thickness measurements along the section for PCC surface layer for the SPS-8 Section 39-0809.
Figure 3: Chart. Example of normally distributed thickness deviations (elevation data, LC, target thickness 152 mm [6 in]).
Figure 4: Chart. Example of a skewed distribution for layer thickness deviation (core data, PCC, target thickness 279 mm [11 in]).
AC = Asphalt concrete (surface course).
AASHTO = American Association of State Highway and Transportation Officials.
ASTM = American Society for Testing and Materials.
ATB = Asphalt-treated base (dense-graded, generally similar to the AC surface course).
COV = Coefficient of variation.
CRCP = Continuously reinforced concrete pavement.
CTB = Cement-treated base.
DGAB = Dense-graded aggregate base (unbound).
DGATB = Dense-graded asphalt-treated base (bound).
FHWA = Federal Highway Administration.
FWD = Falling Weight Deflectometer.
GB = Granular base.
GPR = Ground Penetrating Radar.
GPS = General Pavement Studies.
HMAC = Hot-mix asphalt concrete.
JPCP= Jointed plain concrete pavement.
JRCP= Jointed reinforced concrete pavement.
LC= Lean concrete (base).
LTPP= Long Term Pavement Performance [program].
OD = Outside diameter.
PCC = Portland cement concrete.
PATB = Permeable asphalt-treated base.
QA = Quality assurance.
QC = Quality control.
RSC = Regional Support Contractor.
SHRP = Strategic Highway Research Program.
SB = Surface and binder [layer].
SPS = Specific Pavement Studies.
Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials, Asphalt pavements, concrete pavements, LTPP, layer thickness, thickness variation, sampling
TRT Terms: Pavements--United States--Testing--Databases, Pavements--Performance, pavement layers