Report on the Diagnosis, Prognosis, and Mitigation of Alkali-Silica Reaction (ASR) in Transportation Structures
Table of Contents
- Technical Report Documentation Page
- Notice/Quality Assurance Statement
- 1.0 Introduction
- 2.0 General Approach
- 3.0 ASR Investigation Program Level 1: Condition Survey
- 4.0 ASR Investigation Program Level 2: Preliminary Studies for the Diagnosis of ASR
- 5.0 ASR Investigation Program Level 3: Detailed Studies for the Diagnosis/Prognosis of ASR
- 5.1. Introduction
- 5.2. In-sit
- 5.3. Detailed Laboratory Investigations
- 5.4. Numerical AAR Simulation Modeling
- 5.5. Collective Assessment of In-situ and Laboratory Investigations
- 5.5.1. Scope
- 5.5.2. ASR expansion attained to date
- 5.5.3. Current rate of expansion due to AAR
- 5.5.4. Potential for further expansion due to AAR
- 5.5.5. Risks relative to structural stability (reinforced members of bridges)
- 5.5.6. Additional risks relative to security of persons and vehicles
- 5.5.7. Potential for further deterioration due to other mechanisms
- 5.5.8. Summary of decision criteria for application of mitigation/remediation measures
- 6.0 Mitigation Measures for AAR-Affected Structures
- 7.0 Concluding Remarks
- 8.0 References
- Appendix A
- Appendix B
- Appendix C
- Appendix D
- Appendix E
- Appendix F
- Appendix G
- Appendix H
- Appendix I
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 information contained in this document.
This report does not constitute a standard, specification, or regulation.
Quality Assurance Statement
The Federal Highway Administration 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-HIF-09-004 |
2. Government Accession No. | 3. Recipient's Catalog No. | |
| 4. Title and Subtitle Report on the Diagnosis, Prognosis, and Mitigation of Alkali-Silica Reaction (ASR) in Transportation Structures |
5. Report Date January 2010 | ||
| 6. Performing Organization Code: | |||
| 7. Author(s) Benoit Fournier, Marc-André Bérubé, Kevin J. Folliard, Michael Thomas |
8. Performing Organization Report No. | ||
| 9. Performing Organization Name and Address The Transtec Group, Inc. 6111 Balcones Drive Austin, TX 78731 |
10. Work Unit No. (TRAIS) | ||
| 11. Contract or Grant No. | |||
| 12. Sponsoring Agency Name and Address Office of Pavement Technology 1200 New Jersey Avenue, S.E. Washington, D.C. 20590 |
13. Type of Report and Period Covered Final Report | ||
| 14. Sponsoring Agency Code | |||
| 15. Supplementary Notes Contracting Officer's Technical Representative: Gina Ahlstrom |
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| 16. Abstract Alkali-aggregate reaction (AAR) is only one of the many factors that might be fully or partly responsible for the deterioration and premature loss in serviceability of concrete infrastructure. Two types of AAR reaction are currently recognized depending on the nature of the reactive mineral; alkalisilica reaction (ASR) involves various types of reactive silica (SiO2) minerals and alkali-carbonate reaction (ACR) involves certain types of dolomitic rocks (CaMg(CO3)2). Both types of reaction can result in expansion and cracking of concrete elements, leading to a reduction in the service life of concrete structures. This document described an approach for the diagnosis and prognosis of alkali-aggregate reactivity in transportation structures. A preliminary investigation program is first proposed to allow for the early detection of ASR, followed by an assessment (diagnosis) of ASR completed by a sampling program and petrographic examination of a limited number of cores collected from selected structural members. In the case of structures showing evidence of ASR that justifies further investigations, this report also provides an integrated approach involving the quantification of the contribution of critical parameters with regards to ASR. | |||
| 17. Key Words Alkali-silica reaction, concrete durability, mitigation, existing structures, laboratory testing, hardened concrete, field investigation |
18. Distribution Statement | ||
| 19. Security Classification (of this report) |
20. Security Classification (of this page) |
21. No of Pages |
22. Price |
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