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Report on the Diagnosis, Prognosis, and Mitigation of Alkali-Silica Reaction (ASR) in Transportation Structures

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This report does not constitute a standard, specification, or regulation.

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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
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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Updated: 12/17/2012