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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2019. Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports. Washington, DC: The National Academies Press. doi: 10.17226/25553.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2019. Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports. Washington, DC: The National Academies Press. doi: 10.17226/25553.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2019. Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports. Washington, DC: The National Academies Press. doi: 10.17226/25553.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2019. Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports. Washington, DC: The National Academies Press. doi: 10.17226/25553.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2019. Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports. Washington, DC: The National Academies Press. doi: 10.17226/25553.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2019. Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports. Washington, DC: The National Academies Press. doi: 10.17226/25553.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2019. Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports. Washington, DC: The National Academies Press. doi: 10.17226/25553.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2019. Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports. Washington, DC: The National Academies Press. doi: 10.17226/25553.
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Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports A Synthesis of Airport Practice Kurt D. Smith Applied pAvement technology, inc. Urbana, IL Thomas J. Van Dam nce Reno, NV 2019 Research sponsored by the Federal Aviation Administration Subscriber Categories Aviation • Maintenance and Preservation • Pavements A I R P O R T C O O P E R A T I V E R E S E A R C H P R O G R A M ACRP SYNTHESIS 96

ACRP SYNTHESIS 96 Project 11-03, Topic S09-08 ISSN 1935-9187 ISBN 978-0-309-48055-0 Library of Congress Control Number 2019944274 © 2019 National Academy of Sciences. All rights reserved. COPYRIGHT INFORMATION Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein. Cooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, FMCSA, FRA, FTA, Office of the Assistant Secretary for Research and Technology, PHMSA, or TDC endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from CRP. NOTICE The report was reviewed by the technical panel and accepted for publication according to procedures established and overseen by the Transportation Research Board and approved by the National Academies of Sciences, Engineering, and Medicine. The opinions and conclusions expressed or implied in this report are those of the researchers who performed the research and are not necessarily those of the Transportation Research Board; the National Academies of Sciences, Engineering, and Medicine; or the program sponsors. The Transportation Research Board; the National Academies of Sciences, Engineering, and Medicine; and the sponsors of the Airport Cooperative Research Program do not endorse products or manufacturers. Trade or manufacturers’ names appear herein solely because they are considered essential to the object of the report. Published reports of the AIRPORT COOPERATIVE RESEARCH PROGRAM are available from Transportation Research Board Business Office 500 Fifth Street, NW Washington, DC 20001 and can be ordered through the Internet by going to http://www.national-academies.org and then searching for TRB Printed in the United States of America AIRPORT COOPERATIVE RESEARCH PROGRAM Airports are vital national resources. They serve a key role in trans- portation of people and goods and in regional, national, and interna- tional commerce. They are where the nation’s aviation system connects with other modes of transportation and where federal responsibility for managing and regulating air traffic operations intersects with the role of state and local governments that own and operate most airports. Research is necessary to solve common operating problems, to adapt appropriate new technologies from other industries, and to introduce innovations into the airport industry. The Airport Cooperative Research Program (ACRP) serves as one of the principal means by which the airport industry can develop innovative near-term solutions to meet demands placed on it. The need for ACRP was identified in TRB Special Report 272: Airport Research Needs: Cooperative Solutions in 2003, based on a study spon- sored by the Federal Aviation Administration (FAA). ACRP carries out applied research on problems that are shared by airport operating agen- cies and not being adequately addressed by existing federal research programs. ACRP is modeled after the successful National Cooperative Highway Research Program (NCHRP) and Transit Cooperative Research Program (TCRP). ACRP undertakes research and other technical activi- ties in various airport subject areas, including design, construction, legal, maintenance, operations, safety, policy, planning, human resources, and administration. ACRP provides a forum where airport operators can cooperatively address common operational problems. ACRP was authorized in December 2003 as part of the Vision 100— Century of Aviation Reauthorization Act. The primary participants in the ACRP are (1) an independent governing board, the ACRP Oversight Committee (AOC), appointed by the Secretary of the U.S. Department of Transportation with representation from airport operating agencies, other stakeholders, and relevant industry organizations such as the Airports Council International-North America (ACI-NA), the American Associa- tion of Airport Executives (AAAE), the National Association of State Aviation Officials (NASAO), Airlines for America (A4A), and the Airport Consultants Council (ACC) as vital links to the airport community; (2) TRB as program manager and secretariat for the governing board; and (3) the FAA as program sponsor. In October 2005, the FAA executed a contract with the National Academy of Sciences formally initiating the program. ACRP benefits from the cooperation and participation of airport professionals, air carriers, shippers, state and local government officials, equipment and service suppliers, other airport users, and research organi- zations. Each of these participants has different interests and responsibili- ties, and each is an integral part of this cooperative research effort. Research problem statements for ACRP are solicited periodically but may be submitted to TRB by anyone at any time. It is the responsibility of the AOC to formulate the research program by identifying the highest priority projects and defining funding levels and expected products. Once selected, each ACRP project is assigned to an expert panel appointed by TRB. Panels include experienced practitioners and research specialists; heavy emphasis is placed on including airport professionals, the intended users of the research products. The panels prepare project statements (requests for proposals), select contractors, and provide technical guidance and counsel throughout the life of the project. The process for developing research problem statements and selecting research agencies has been used by TRB in managing coop- erative research programs since 1962. As in other TRB activities, ACRP project panels serve voluntarily without compensation. Primary emphasis is placed on disseminating ACRP results to the intended users of the research: airport operating agencies, service pro- viders, and academic institutions. ACRP produces a series of research reports for use by airport operators, local agencies, the FAA, and other interested parties; industry associations may arrange for workshops, training aids, field visits, webinars, and other activities to ensure that results are implemented by airport industry practitioners.

The National Academy of Sciences was established in 1863 by an Act of Congress, signed by President Lincoln, as a private, non- governmental institution to advise the nation on issues related to science and technology. Members are elected by their peers for outstanding contributions to research. Dr. Marcia McNutt is president. The National Academy of Engineering was established in 1964 under the charter of the National Academy of Sciences to bring the practices of engineering to advising the nation. Members are elected by their peers for extraordinary contributions to engineering. Dr. C. D. Mote, Jr., is president. The National Academy of Medicine (formerly the Institute of Medicine) was established in 1970 under the charter of the National Academy of Sciences to advise the nation on medical and health issues. Members are elected by their peers for distinguished contributions to medicine and health. Dr. Victor J. Dzau is president. The three Academies work together as the National Academies of Sciences, Engineering, and Medicine to provide independent, objective analysis and advice to the nation and conduct other activities to solve complex problems and inform public policy decisions. The National Academies also encourage education and research, recognize outstanding contributions to knowledge, and increase public understanding in matters of science, engineering, and medicine. Learn more about the National Academies of Sciences, Engineering, and Medicine at www.national-academies.org. The Transportation Research Board is one of seven major programs of the National Academies of Sciences, Engineering, and Medicine. The mission of the Transportation Research Board is to increase the benefits that transportation contributes to society by providing leadership in transportation innovation and progress through research and information exchange, conducted within a setting that is objective, interdisciplinary, and multimodal. The Board’s varied committees, task forces, and panels annually engage about 7,000 engineers, scientists, and other transportation researchers and practitioners from the public and private sectors and academia, all of whom contribute their expertise in the public interest. The program is supported by state transportation departments, federal agencies including the component administrations of the U.S. Department of Transportation, and other organizations and individuals interested in the development of transportation. Learn more about the Transportation Research Board at www.TRB.org.

C O O P E R A T I V E R E S E A R C H P R O G R A M S CRP STAFF FOR ACRP SYNTHESIS 96 Christopher J. Hedges, Director, Cooperative Research Programs Lori L. Sundstrom, Deputy Director, Cooperative Research Programs Marci A. Greenberger, Manager, Airport Cooperative Research Program Thomas J. Helms, Jr., Senior Program Officer Stephanie L. Campbell, Senior Program Assistant Eileen P. Delaney, Director of Publications Natalie Barnes, Associate Director of Publications Hilary Freer, Senior Editor ACRP PROJECT 11-03 PANEL Joshua D. Abramson, Easterwood Airport Management, College Station, TX (Chair) Debbie K. Alke, Montana DOT, Helena, MT (retired) Gloria G. Bender, TransSolutions, LLC, Fort Worth, TX David A. Byers, Quadrex Aviation, LLC, Melbourne, FL David N. Edwards, Jr., Greenville–Spartanburg Airport District, Greer, SC Brenda L. Enos, Burns & McDonnell, Kansas City, MO Linda Howard, Independent Aviation Consultant, Bastrop, TX Patrick W. Magnotta, FAA Liaison Matthew J. Griffin, Airports Consultants Council Liaison Liying Gu, Airports Council International–North America Liaison Adam Williams, Aircraft Owners & Pilots Association Liaison Christine Gerencher, TRB Liaison TOPIC 09-08 PANEL Mujeeb Basha, American Veterans Industries, LLC, Lockport, IL Alessandra Bianchini, Air Force Civil Engineer Center, Tyndall AFB, FL Ernie Heymsfield, University of Arkansas - Fayetteville, Fayetteville, AR Vivek Khanna, WSP, Dallas, TX Tyson D. Rupnow, Louisiana DOTD, Baton Rouge, LA David Brill, FAA Liaison Gregory D. Cline, FAA Liaison Gary Mitchell, American Concrete Pavement Association Liaison Nelson H. Gibson, TRB Liaison

ABOUT THE ACRP SYNTHESIS PROGRAM Airport administrators, engineers, and researchers often face problems for which information already exists, either in documented form or as undocumented experience and practice. This infor- mation may be fragmented, scattered, and unevaluated. As a consequence, full knowledge of what has been learned about a problem may not be brought to bear on its solution. Costly research findings may go unused, valuable experience may be overlooked, and due consideration may not be given to recommended practices for solving or alleviating the problem. There is information on nearly every subject of concern to the airport industry. Much of it derives from research or from the work of practitioners faced with problems in their day-to-day work. To provide a systematic means for assembling and evaluating such useful information and to make it available to the entire airport community, the Airport Cooperative Research Program authorized the Transportation Research Board to undertake a continuing project. This project, ACRP Project 11-03, “Synthesis of Information Related to Airport Practices,” searches out and synthesizes useful knowl- edge from all available sources and prepares concise, documented reports on specific topics. Reports from this endeavor constitute an ACRP report series, Synthesis of Airport Practice. This synthesis series reports on current knowledge and practice, in a compact format, without the detailed directions usually found in handbooks or design manuals. Each report in the series provides a compendium of the best knowledge available on those measures found to be the most successful in resolving specific problems. FOREWORD By Thomas J. Helms, Jr. Staff Officer Transportation Research Board The focus of this report is on current practices for mitigating alkali-silica reaction (ASR) in affected pavements at airports. Some concrete pavements commonly used at airports are susceptible to the destructive effects of ASR. Given the substantial initial investment required for pavement, airports are interested in using mitigations to slow the effects of ASR. This study is based on information acquired through a literature review, survey results from 19 airports participating in the study from a range of geographic locations and airport categories, and personal interviews with representatives of several airports. The results of the literature review and survey along with case examples repre- senting interviews with airports known to have experienced ASR on airside pavement facilities are presented. Mr. Kurt D. Smith, Applied Pavement Technology, Inc., Urbana, Illinois, and Mr. Thomas J. Van Dam, Ph.D., NCE, Reno, Nevada, synthesized the information and wrote the report. The members of the topic panel are acknowledged on page iv. This synthesis is an immediately useful document that records the practices that were acceptable within the limitations of the knowledge available at the time of its preparation. As progress in research and practice continues, new knowledge will be added to that now at hand.

AUTHOR ACKNOWLEDGMENTS The research report herein was performed under Airport Cooperative Research Program (ACRP) Project 11-03 by Applied Pavement Technology, Inc. (APTech) and NCE. Mr. Kurt Smith, P.E., APTech, served as the Principal Investigator and primary author of the report. Dr. Tom Van Dam, P.E., NCE, was the Co-Principal Investigator and the second report author. The authors would like to acknowledge the support provided by Ms. RoseMary Evans (APTech) in preparing, distributing, monitoring, and summarizing the survey results, as well as the assistance provided by Mr. Kundayi Mugabi in communicating with the respondents. Moreover, several APTech engineers (Mr. Peter-Paul Dzwilewski, Mr. Kyle Potvin, Ms. Carrie Truschke, Mr. Monty Wade, Mr. David Peshkin, Ms. Gen Long, Mr. Jim Bruinsma, Mr. Bill Weiss, and Ms. Maggie Covalt) and NCE engineers (Mr. Jeff Stempihar and Ms. Sara Henderson) graciously shared contact information, design reports, and photographs pertinent to the study, and their help and support are greatly appreciated. Some individuals representing airport owner/agencies participated in the surveys that were conducted under this study and willingly shared data and information, and their assistance is dutifully recognized. In addition, the following individuals representing the listed airports willingly provided design and con- struction details, materials information, and photographs for use in the case examples. Their time and contributions are gratefully acknowledged: • Phoenix Sky Harbor International Airport: Mr. Rick Slankard, Mr. Curtis Richardson, and Mr. Jon Rudd, City of Phoenix, Aviation Department. • Hartsfield-Jackson Atlanta International Airport: Mr. Rick Boudreau (Boudreau Engineering, Inc.), Mr. Quintin Watkins (Michael Baker International), Mr. Charlie Greer (Consultant), and Dr. Tara Cavalline (University of North Carolina–Charlotte). • Bangor International Airport: Mr. Jason Homiak (Jacobs Engineering Group, Inc.). • Colorado Springs Airport: Mr. Troy Stover, Colorado Springs Airport.

1 Summary 5 Chapter 1 Introduction 7 Objectives 7 Work Approach 7 Report Organization 9 Chapter 2 Literature Review Summary 9 ASR History Highlights 11 Mechanisms of ASR Development 13 Identifying ASR in Pavements 17 Preventing ASR in New Concrete Construction 22 Treatment of ASR in Existing Concrete Pavements 32 Summary 34 Chapter 3 Airport Surveys 34 Introduction 34 Survey Content 35 Verification of ASR 37 Corrective Treatments to Address ASR 39 Mitigation Strategies to Address ASR 40 Other Comments 40 Summary 41 Chapter 4 Case Examples 41 Introduction 41 Phoenix Sky Harbor International Airport 44 Hartsfield-Jackson Atlanta International Airport 46 Bangor International Airport 48 Colorado Springs Airport 51 Key Takeaways from Case Examples 52 Chapter 5 Conclusions and Further Research 52 Overall Findings 54 Suggestions for Further Research 55 References A-1 Appendix A Survey Questionnaire B-1 Appendix B Survey Results C-1 Appendix C Bibliography C O N T E N T S Note: Photographs, figures, and tables in this report may have been converted from color to grayscale for printing. The electronic version of the report (posted on the web at www.trb.org) retains the color versions.

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Some concrete pavements commonly used at airports are susceptible to the destructive effects of alkali-silica reaction (ASR). The presence of ASR on concrete pavements can have a devastating effect on pavement performance, not only in terms of reduced functionality, but also in terms of shortened service lives.

The focus of ACRP Synthesis 96: Practices to Mitigate Alkali-Silica Reaction (ASR) Affected Pavements at Airports is on current practices for mitigating ASR in affected pavements at airports. Given the substantial initial investment required for pavement, airports are interested in using mitigations to slow the effects of ASR and prolong the life of airfield concrete pavements.

This synthesis identifies the current state of the practice regarding the mitigation measures used on existing ASR-affected airport pavements that service aircraft and summarizes the experiences and practices of airports in dealing with the distress (including conventional treatments, but also any new or emerging technologies).

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