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REPORT
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number:  â€‹FHWA-HRT-17-049    Date:  October 2017
Publication Number: ​FHWA-HRT-17-049
Date: October 2017

 

Investigation of Increase in Roughness Due to Environmental Factors in Flexible Pavements Using Profile Data From Long-Term Pavement Performance Specific Pavement Studies 1 Experiment

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FOREWORD

Previous studies have been performed to investigate roughness development in pavements. The Long-Term Pavement Performance (LTPP) Program has been collecting longitudinal profile data for the two wheelpaths and the center of the lane using an inertial profiler for over 20 years. The goal of this study was to evaluate the changes in roughness as measured by the International Roughness Index (IRI) along the center of the lane at Specific Pavement Studies 1 (structural factors for flexible pavement) sections over time and identify environmental and subgrade parameters that contribute to the increase in roughness. This information can be used to improve pavement design procedures and further develop models for predicting the change in roughness due to environmental conditions. The study shows it is very important to provide drainage for pavements built over fine-grained subgrade in the wet-freeze zone to reduce the rate of change of roughness. This study also compared the changes in roughness using the computed IRI along the center of the lane with the changes in mean IRI (i.e., average IRI of the left and the right wheelpaths). The intended audiences for this report are pavement engineers and researchers.

Cheryl Allen Richter, Ph.D., P.E.
Director, Office of Infrastructure
Research and Development

Notice

This document is disseminated under the sponsorship of the U.S. Department of Transportation (USDOT) in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. This report does not constitute a standard, specification, or regulation.

The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names appear in this report only because they are considered essential to the objective of the document.

Quality Assurance Statement

The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.

 

Technical Report Documentation Page

1. Report No.

FHWA-HRT-17-049

2. Government Accession No. 3 Recipient's Catalog No.
4. Title and Subtitle

Investigation of Increase in Roughness Due to Environmental Factors in Flexible Pavements Using Profile Data from Long-Term Pavement Performance Specific Pavement Studies 1 Experiment

5. Report Date

October 2017

6. Performing Organization Code
7. Author(s)

R.W. Perera and A. Al-Rawashdeh

8. Performing Organization Report No.

 

9. Performing Organization Name and Address

SME
43980 Plymouth Oaks Blvd.
Plymouth, MI 48170

10. Work Unit No. (TRAIS)

11. Contract or Grant No.

DTFH61-14-C-00021

12. Sponsoring Agency Name and Address

Federal Highway Administration
6300 Georgetown Pike, HRDI-30
McLean, VA 22101

13. Type of Report and Period Covered

Covered
Final Report; July 2014–January 2017

14. Sponsoring Agency Code

 

15. Supplementary Notes

The Contracting Officer’s Technical Representative (COTR) was Larry Wiser, HRDI-30.

16. Abstract

From the start of the Long-Term Pavement Performance (LTPP) Program, the longitudinal profiles along the two wheelpaths at test sections have been collected using an inertial profiler. In December 1996, starting with the K.J. Law T-6600 inertial profiler, all profilers used in the LTPP Program have collected profile data along the center of the lane in addition to collecting data along the two wheelpaths. The change in the profile along the center of the lane in flexible pavements was expected to be affected mainly by environmental effects. The goal of this project was to evaluate the changes in the International Roughness Index (IRI) along the center of the lane at Specific Pavement Studies 1 test sections over time and identify environmental and subgrade parameters that contribute to an increase in IRI along the center of the lane. The following activities were performed for this project: (1) analyze the center of the lane IRI (CLIRI) and mean IRI (MIRI) (i.e., average IRI of the left and the right wheelpaths) at test sections to evaluate changes over time, (2) compare the change in IRI for the center of the lane with the change in MIRI at the test sections, (3) identify subgrade and environmental parameters that contribute to an increase in IRI along the center of the lane, (4) perform a detailed evaluation to identify how the CLIRI changes for a select group of test sections, and (5) develop models to predict the change in CLIRI at the test sections.

17. Key Words

IRI, LTPP, long-term pavement performance, pavement smoothness, pavement roughness.

18. Distribution Statement

No restrictions. This document is available through the National Technical Information Service,
Springfield, VA 22161.
http://www.ntis.gov

19. Security Classification
(of this report)

Unclassified

20. Security Classification
(of this page)

Unclassified

21. No. of Pages

193

22. Price
Form DOT F 1700.7 (8-72) Reproduction of completed page authorized

 

 

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