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Coordinating, Developing, and Delivering Highway Transportation Innovations

 
REPORT
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number:  FHWA-HRT-15-063     Date:  March 2017
Publication Number: FHWA-HRT-15-063
Date: March 2017

 

Enhanced Analysis of Falling Weight Deflectometer Data for Use With Mechanistic-Empirical Flexible Pavement Design and Analysis and Recommendations for Improvements to Falling Weight Deflectometers

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FOREWORD

This report documents a study conducted to review the status of falling weight deflectometer (FWD) equipment, data collection, analysis, and interpretation, including dynamic backcalculation, and to develop enhanced analysis procedures and recommendations for the effective use of FWD technology as it relates to the flexible pavement models and procedures incorporated within the Mechanistic-Empirical Pavement Design Guide developed by the National Cooperative Highway Research Program and subsequently adopted by the American Association of State Highway and Transportation Officials. In this context, dynamic backcalculation refers to the modeling of the dynamic or impact nature of the FWD loading and resulting pavement response of in-service flexible pavements for pavement structural analysis and rehabilitation design. The research effort resulted in development analysis methodologies, software tools implementing those analysis methodologies and a potential list of recommendations for FWD equipment enhancements, all of which are detailed in this report. This report is intended for use by pavement engineers involved in structural evaluation and rehabilitation design of flexible pavements and researchers involved in development of new procedures for the modeling and analysis of in-service flexible pavements.

Cheryl Allen Richter
Director, Office of Infrastructure
Research and Development

Notice

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 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-15-063

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

Enhanced Analysis of Falling Weight Deflectometer Data for Use With Mechanistic-Empirical Flexible Pavement Design and Analysis and Recommendations for Improvements to Falling Weight Deflectometers

5. Report Date

March 2017

6. Performing Organization Code
7. Author(s)

Karim Chatti, M. Emin Kutay, Nizar Lajnef, Imen Zaabar, Sudhir Varma, and Hyung Suk Lee

8. Performing Organization Report No.

 

9. Performing Organization Name and Address

Michigan State University
426 Auditorium Road
East Lansing, MI 48824

10. Work Unit No. (TRAIS)

11. Contract or Grant No.

DTFH61-11-C-00026

12. Sponsoring Agency Name and Address

Federal Highway Administration
Office of Acquisition Management
1200 New Jersey Avenue SE
Washington, DC 20590

13. Type of Report and Period Covered

Final Report, April 2011–November 2013

14. Sponsoring Agency Code

 

15. Supplementary Notes

The Contracting Officer’s Technical Representative was Nadarajah Sivaneswaran, HRDI-20.

16. Abstract

This report describes the efforts undertaken to review the status of falling weight deflectometer (FWD) equipment, data collection, analysis, and interpretation, including dynamic backcalculation, as they relate to the models and procedures incorporated in the Mechanistic-Empirical Pavement Design Guide. The work conducted in this project resulted in the following:

  • Development of a backcalculation scheme (BACKLAVA) in the time domain using a quasi-static model (LAVA) as its forward solution and genetic algorithm (GA) as its search engine. BACKLAVA is a backcalculation algorithm for a constant asphalt concrete (AC) layer temperature.

  • Development of a backcalculation scheme (BACKLAVAP) in the time domain using a quasi-static model (LAVAP) as its forward solution and GA as its search engine. BACKLAVAP is a backcalculation algorithm for a temperature profile in an AC layer.

  • Development of a backcalculation scheme (BACKLAVAN) in the time domain using a quasi-static model (LAVAN) as its forward solution and GA as its search engine. BACKLAVAN is a backcalculation algorithm for a viscoelastic AC layer and a nonlinear base layer.

  • Development of a backcalculation scheme (DYNABACK-VE) in the time domain using a time-domain viscoelastic dynamic model (ViscoWave-II) as its forward solution and a hybrid approach (GA and Levenberg-Marquardt algorithm) as its search engine. DYNABACK-VE is a backcalculation algorithm for a viscoelastic AC layer with temperature profile and linear unbound layers.

  • Short list of recommendations for FWD equipment enhancements.

The tools developed in this project are standalone applications that could be used on most computers.

17. Key Words

Pavement management, Falling weight deflectometer, Backcalculation, Time domain analysis, Viscoelastic analysis, Forward solution

18. Distribution Statement

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

19. Security Classification
(of this report)

Unclassified

20. Security Classification
(of this page)

Unclassified

21. No. of Pages

319

22. Price

N/A

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

 

 

 

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