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Publication Number: FHWA-04-111
Date: February 2005

Evaluation of The Laboratory Asphalt Stability Test

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FOREWORD

The Laboratory Asphalt Stability Test (LAST) was proposed by the researchers of the National Cooperative Highway Research Program (NCHRP) 9-10 program as a possible new method to evaluate the storage stability of modified asphalts. Federal Highway Administration (FHWA) was assigned the responsibility for evaluating the LAST device. This involved three tasks:

The modified asphalts used in NCHRP 90-07 were investigated in this study. These included elastomers, plastomers, elasto-plastomers, and crumb rubber. The eight binders chosen all met the Superpave performance grading of 70-28 (PG70-28). This report details the work at FHWA's Turner-Fairbank Highway Research Center in evaluating the thermal stability of modified binders using the LAST device.

Paul Teng, 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-RD-04-111

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

Evaluation of the Laboratory Asphalt Stability Test

5. Report Date

February 2005

6. Performing Organization Code

N/A

7. Author(s)

Jack Youtcheff , N. Wijayatilleke, and A. Shenoy

8. Performing Organization Report No.

N/A

9. Performing Organization Name and Address

Office of Infrastructure Research and Development
Federal Highway Administration
6300 Georgetown Pike
McLean, VA 22101

10. Work Unit No. (TRAIS)

N/A

11. Contract or Grant No.

In House Report

12. Sponsoring Agency Name and Address

Office of Infrastructure Research and Development
Federal Highway Administration
6300 Georgetown Pike
McLean, VA 22101

13. Type of Report and Period Covered

Final-July 2003

14. Sponsoring Agency Code

 

15. Supplementary Notes

FHWA Contact: Jack Youtcheff, HRDI-11

16. Abstract

The Laboratory Asphalt Stability Test (LAST) was proposed by the researchers of the National Cooperative Highway Research Program (NCHRP) 9-10 program as a possible new method to evaluate the storage stability of modified asphalts. The test involved exposing the binders with and without mechanical agitation at elevated temperatures for extended lengths of time to assess the thermal stability of the binders. The Federal Highway Administration (FHWA) was assigned the responsibility for evaluating the LAST. The task involved (a) procuring a commercial version of the LAST, (b) correcting perceived deficiencies, and (c) evaluating the test method thoroughly.

17. Key Words

Storage stability, LAST, test method, polymer-modified asphalt binders

18. Distribution Statement

No restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161.

19. Security Classification
(of this report)

Unclassified

20. Security Classification
(of this page)

Unclassified

21. No. of Pages

50

22. Price

 

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

SI* (Modern Metric) Conversion Factors


TABLE OF CONTENTS

1. INTRODUCTION

2. EXPERIMENTAL DESIGN

3. RESULTS AND DISCUSSION

4. CONCLUDING REMARKS

APPENDIX A

APPENDIX B

APPENDIX C

ACKNOWLEDGEMENTS

REFERENCE

ADDITIONAL SOURCES

 

LIST OF FIGURES

LIST OF TABLES

 

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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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