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NATIONAL NCHRP SYNTHESIS 411 COOPERATIVE HIGHWAY RESEARCH PROGRAM Microsurfacing A Synthesis of Highway Practice

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TRANSPORTATION RESEARCH BOARD 2010 EXECUTIVE COMMITTEE* OFFICERS Chair: Michael R. Morris, Director of Transportation, North Central Texas Council of Governments, Arlington Vice Chair: Neil J. Pedersen, Administrator, Maryland State Highway Administration, Baltimore Executive Director: Robert E. Skinner, Jr., Transportation Research Board MEMBERS J. BARRY BARKER, Executive Director, Transit Authority of River City, Louisville, KY ALLEN D. BIEHLER, Secretary, Pennsylvania DOT, Harrisburg LARRY L. BROWN, SR., Executive Director, Mississippi DOT, Jackson DEBORAH H. BUTLER, Executive Vice President, Planning, and CIO, Norfolk Southern Corporation, Norfolk, VA WILLIAM A.V. CLARK, Professor, Department of Geography, University of California, Los Angeles EUGENE A. CONTI, JR., Secretary of Transportation, North Carolina DOT, Raleigh NICHOLAS J. GARBER, Henry L. Kinnier Professor, Department of Civil Engineering, and Director, Center for Transportation Studies, University of Virginia, Charlottesville JEFFREY W. HAMIEL, Executive Director, Metropolitan Airports Commission, Minneapolis, MN PAULA J. HAMMOND, Secretary, Washington State DOT, Olympia EDWARD A. (NED) HELME, President, Center for Clean Air Policy, Washington, DC ADIB K. KANAFANI, Cahill Professor of Civil Engineering, University of California, Berkeley SUSAN MARTINOVICH, Director, Nevada DOT, Carson City DEBRA L. MILLER, Secretary, Kansas DOT, Topeka SANDRA ROSENBLOOM, Professor of Planning, University of Arizona, Tucson TRACY L. ROSSER, Vice President, Corporate Traffic, Wal-Mart Stores, Inc., Mandeville, LA STEVEN T. SCALZO, Chief Operating Officer, Marine Resources Group, Seattle, WA HENRY G. (GERRY) SCHWARTZ, JR., Chairman (retired), Jacobs/Sverdrup Civil, Inc., St. Louis, MO BEVERLY A. SCOTT, General Manager and Chief Executive Officer, Metropolitan Atlanta Rapid Transit Authority, Atlanta, GA DAVID SELTZER, Principal, Mercator Advisors LLC, Philadelphia, PA DANIEL SPERLING, Professor of Civil Engineering and Environmental Science and Policy; Director, Institute of Transportation Studies; and Interim Director, Energy Efficiency Center, University of California, Davis KIRK T. STEUDLE, Director, Michigan DOT, Lansing DOUGLAS W. STOTLAR, President and CEO, Con-Way, Inc., Ann Arbor, MI C. MICHAEL WALTON, Ernest H. Cockrell Centennial Chair in Engineering, University of Texas, Austin EX OFFICIO MEMBERS PETER H. APPEL, Administrator, Research and Innovative Technology Administration, U.S.DOT J. RANDOLPH BABBITT, Administrator, Federal Aviation Administration, U.S.DOT REBECCA M. BREWSTER, President and COO, American Transportation Research Institute, Smyrna, GA GEORGE BUGLIARELLO, President Emeritus and University Professor, Polytechnic Institute of New York University, Brooklyn; Foreign Secretary, National Academy of Engineering, Washington, DC ANNE S. FERRO, Administrator, Federal Motor Carrier Safety Administration, U.S.DOT LEROY GISHI, Chief, Division of Transportation, Bureau of Indian Affairs, U.S. Department of the Interior, Washington, DC EDWARD R. HAMBERGER, President and CEO, Association of American Railroads, Washington, DC JOHN C. HORSLEY, Executive Director, American Association of State Highway and Transportation Officials, Washington, DC DAVID T. MATSUDA, Deputy Administrator, Maritime Administration, U.S.DOT VICTOR M. MENDEZ, Administrator, Federal Highway Administration, U.S.DOT WILLIAM W. MILLAR, President, American Public Transportation Association, Washington, DC TARA O'TOOLE, Under Secretary for Science and Technology, U.S. Department of Homeland Security, Washington, DC ROBERT J. PAPP (Adm., U.S. Coast Guard), Commandant, U.S. Coast Guard, U.S. Department of Homeland Security, Washington, DC CYNTHIA L. QUARTERMAN, Administrator, Pipeline and Hazardous Materials Safety Administration, U.S.DOT PETER M. ROGOFF, Administrator, Federal Transit Administration, U.S.DOT DAVID L. STRICKLAND, Administrator, National Highway Traffic Safety Administration, U.S.DOT JOSEPH C. SZABO, Administrator, Federal Railroad Administration, U.S.DOT POLLY TROTTENBERG, Assistant Secretary for Transportation Policy, U.S.DOT ROBERT L. VAN ANTWERP (Lt. Gen., U.S. Army), Chief of Engineers and Commanding General, U.S. Army Corps of Engineers, Washington, DC *Membership as of October 2010.

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NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM NCHRP SYNTHESIS 411 Microsurfacing A Synthesis of Highway Practice CONSULTANT DOUGLAS D. GRANSBERG Iowa State University Ames, Iowa S UBSCRIBER C ATEGORIES Highways Maintenance and Preservation Materials Research Sponsored by the American Association of State Highway and Transportation Officials in Cooperation with the Federal Highway Administration TRANSPORTATION RESEARCH BOARD WASHINGTON, D.C. 2010 www.TRB.org

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NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM NCHRP SYNTHESIS 411 Systematic, well-designed research provides the most effective Project 20-05, Topic 41-12 approach to the solution of many problems facing highway ISSN 0547-5570 administrators and engineers. Often, highway problems are of local ISBN 978-0-309-14319-6 interest and can best be studied by highway departments Library of Congress Control No. 2010936037 individually or in cooperation with their state universities and 2010 National Academy of Sciences. All rights reserved. others. However, the accelerating growth of highway transportation develops increasingly complex problems of wide interest to highway authorities. These problems are best studied through a COPYRIGHT INFORMATION coordinated program of cooperative research. Authors herein are responsible for the authenticity of their materials and for In recognition of these needs, the highway administrators of the obtaining written permissions from publishers or persons who own the American Association of State Highway and Transportation copyright to any previously published or copyrighted material used herein. Officials initiated in 1962 an objective national highway research Cooperative Research Programs (CRP) grants permission to reproduce program employing modern scientific techniques. This program is material in this publication for classroom and not-for-profit purposes. supported on a continuing basis by funds from participating Permission is given with the understanding that none of the material will be member states of the Association and it receives the full cooperation used to imply TRB, AASHTO, FAA, FHWA, FMCSA, FTA, or Transit and support of the Federal Highway Administration, United States Development Corporation endorsement of a particular product, method, or Department of Transportation. practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment The Transportation Research Board of the National Academies of the source of any reprinted or reproduced material. For other uses of the was requested by the Association to administer the research material, request permission from CRP. program because of the Board's recognized objectivity and understanding of modern research practices. The Board is uniquely suited for this purpose as it maintains an extensive committee structure from which authorities on any highway transportation NOTICE subject may be drawn; it possesses avenues of communications and The project that is the subject of this report was a part of the National cooperation with federal, state, and local governmental agencies, Cooperative Highway Research Program, conducted by the Transportation universities, and industry; its relationship to the National Research Research Board with the approval of the Governing Board of the National Council is an insurance of objectivity; it maintains a full-time Research Council. research correlation staff of specialists in highway transportation The members of the technical panel selected to monitor this project and matters to bring the findings of research directly to those who are in to review this report were chosen for their special competencies and with a position to use them. regard for appropriate balance. The report was reviewed by the technical panel and accepted for publication according to procedures established and The program is developed on the basis of research needs overseen by the Transportation Research Board and approved by the identified by chief administrators of the highway and transportation Governing Board of the National Research Council. departments and by committees of AASHTO. Each year, specific The opinions and conclusions expressed or implied in this report are those areas of research needs to be included in the program are proposed of the researchers who performed the research and are not necessarily those to the National Research Council and the Board by the American of the Transportation Research Board, the National Research Council, or the Association of State Highway and Transportation Officials. program sponsors. Research projects to fulfill these needs are defined by the Board, and qualified research agencies are selected from those that have submitted proposals. Administration and surveillance of research The Transportation Research Board of the National Academies, the National contracts are the responsibilities of the National Research Council Research Council, and the sponsors of the National Cooperative Highway and the Transportation Research Board. Research Program do not endorse products or manufacturers. Trade or The needs for highway research are many, and the National manufacturers' names appear herein solely because they are considered Cooperative Highway Research Program can make significant essential to the object of the report. contributions to the solution of highway transportation problems of mutual concern to many responsible groups. The program, however, is intended to complement rather than to substitute for or duplicate other highway research programs. Published reports of the NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM are available from: Transportation Research Board Business Office 500 Fifth Street, NW NOTE: The Transportation Research Board of the National Academies, the Washington, DC 20001 National Research Council, the Federal Highway Administration, the American Association of State Highway and Transportation Officials, and the individual and can be ordered through the Internet at: states participating in the National Cooperative Highway Research Program do http://www.national-academies.org/trb/bookstore not endorse products or manufacturers. Trade or manufacturers' names appear herein solely because they are considered essential to the object of this report. Printed in the United States of America

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The National Academy of Sciences is a private, nonprofit, self-perpetuating society of distinguished schol- ars engaged in scientific and engineering research, dedicated to the furtherance of science and technology and to their use for the general welfare. On the authority of the charter granted to it by the Congress in 1863, the Academy has a mandate that requires it to advise the federal government on scientific and techni- cal matters. Dr. Ralph J. Cicerone is president of the National Academy of Sciences. The National Academy of Engineering was established in 1964, under the charter of the National Acad- emy of Sciences, as a parallel organization of outstanding engineers. It is autonomous in its administration and in the selection of its members, sharing with the National Academy of Sciences the responsibility for advising the federal government. The National Academy of Engineering also sponsors engineering programs aimed at meeting national needs, encourages education and research, and recognizes the superior achieve- ments of engineers. Dr. Charles M. Vest is president of the National Academy of Engineering. The Institute of Medicine was established in 1970 by the National Academy of Sciences to secure the services of eminent members of appropriate professions in the examination of policy matters pertaining to the health of the public. The Institute acts under the responsibility given to the National Academy of Sciences by its congressional charter to be an adviser to the federal government and, on its own initiative, to identify issues of medical care, research, and education. Dr. Harvey V. Fineberg is president of the Institute of Medicine. The National Research Council was organized by the National Academy of Sciences in 1916 to associate the broad community of science and technology with the Academy's purposes of furthering knowledge and advising the federal government. Functioning in accordance with general policies determined by the Acad- emy, the Council has become the principal operating agency of both the National Academy of Sciences and the National Academy of Engineering in providing services to the government, the public, and the scien- tific and engineering communities. The Council is administered jointly by both the Academies and the Insti- tute of Medicine. Dr. Ralph J. Cicerone and Dr. Charles M. Vest are chair and vice chair, respectively, of the National Research Council. The Transportation Research Board is one of six major divisions of the National Research Council. The mission of the Transportation Research Board is to provide leadership in transportation innovation and progress through research and information exchange, conducted within a setting that is objective, interdisci- plinary, and multimodal. The Board's varied activities 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 Transporta- tion, and other organizations and individuals interested in the development of transportation. www.TRB.org www.national-academies.org

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NCHRP COMMITTEE FOR PROJECT 20-05 COOPERATIVE RESEARCH PROGRAMS STAFF CHRISTOPHER W. JENKS, Director, Cooperative Research CHAIR Programs CATHERINE NELSON, Oregon DOT CRAWFORD F. JENCKS, Deputy Director, Cooperative Research Programs MEMBERS NANDA SRINIVASAN, Senior Program Officer KATHLEEN S. AMES, Michael Baker, Jr. Inc. EILEEN DELANEY, Director of Publications STUART D. ANDERSON, Texas A&M University CYNTHIA J. BURBANK, PB Americas, Inc. NCHRP SYNTHESIS STAFF LISA FREESE, Scott County (MN) Public Works Division STEPHEN R. GODWIN, Director for Studies and Special Programs MALCOLM T. KERLEY, Virginia DOT JON M. WILLIAMS, Program Director, IDEA and Synthesis Studies RICHARD D. LAND, California DOT JO ALLEN GAUSE, Senior Program Officer JAMES W. MARCH, Columbia, MD GAIL R. STABA, Senior Program Officer JOHN M. MASON, JR., Auburn University DONNA L. VLASAK, Senior Program Officer ANANTH PRASAD, Florida DOT DON TIPPMAN, Senior Editor ROBERT L. SACK, New York State DOT CHERYL KEITH, Senior Program Assistant FRANCINE SHAW-WHITSON, Federal Highway Administration DEBBIE IRVIN, Program Associate LARRY VELASQUEZ, QUALCON, Inc. TOPIC PANEL FHWA LIAISON SIMONE ARDOIN, Louisiana Department of Transportation JACK JERNIGAN and Development LITA DAVIS, County of San Diego Department of Public Works TRB LIAISON (retired) STEPHEN F. MAHER AMIR N. HANNA, Transportation Research Board THOMAS A. KANE, New York State Department of Transportation ROBERT E. LEE, Texas Department of Transportation FRANK N. LISLE, Transportation Research Board DAVID PESHKIN, Applied Pavement Technology, Inc., Urbana, IL RUSTY PRICE, Intermountain Slurry Seal, Inc., Salt Lake City, UT MARY STROUP-GARDINER, Gardiner Technical Services LLC, Chico, CA THOMAS J. WOOD, Minnesota Department of Transportation STEPHEN R. MUELLER, Federal Highway Administration, Lakewood, CO (Liaison) Cover figure: Continuous front-loaded, self-propelled microsurfacing machine and crew (courtesy: Rusty Price, Intermountain Slurry Seal, Inc.).

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FOREWORD Highway administrators, engineers, and researchers often face problems for which infor- mation already exists, either in documented form or as undocumented experience and prac- tice. This information 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 alleviat- ing the problem. There is information on nearly every subject of concern to highway administrators and engineers. 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 eval- uating such useful information and to make it available to the entire highway community, the American Association of State Highway and Transportation Officials--through the mechanism of the National Cooperative Highway Research Program--authorized the Transportation Research Board to undertake a continuing study. This study, NCHRP Proj- ect 20-05, "Synthesis of Information Related to Highway Problems," searches out and syn- thesizes useful knowledge from all available sources and prepares concise, documented reports on specific topics. Reports from this endeavor constitute an NCHRP report series, Synthesis of Highway 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. PREFACE This study gathers information on the use of highway microsurfacing treatments by trans- By Jo Allen Gause portation agencies in the United States and Canada. Microsurfacing is a polymer-modified Senior Program Officer cold-mix surface treatment that can remedy a broad range of problems on today's highways. Transportation The report identifies and discusses practices reported as effective by transportation agen- Research Board cies in microsurfacing project selection, design, contracting, equipment, construction, and performance measures. Information used in this study was acquired through a review of the literature, a survey distributed to maintenance engineers at all U.S. state departments of transportation (DOTs) and Canadian provincial transportation agencies, evaluation of all 50 state DOT micro- surfacing specifications as well as the one used by the U.S. Federal Lands Highway Division, and case studies of six microsurfacing projects from five U.S. states and one Canadian province. Douglas D. Gransberg, Iowa State University, Ames, Iowa, collected and synthesized the information and wrote the report. The members of the topic panel are acknowledged on the preceding page. 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.

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CONTENTS 1 SUMMARY 5 CHAPTER ONE INTRODUCTION Introduction, 5 Synthesis Objective, 5 Background, 5 Key Definitions, 7 Protocol to Develop Conclusions, Effective Practices, and Future Research Needs, 8 Organization of the Report, 10 11 CHAPTER TWO SUMMARY OF INFORMATION COLLECTED Introduction, 11 Synthesis Methodology, 11 General Agency Microsurfacing Information, 11 Summary and Conclusions, 13 14 CHAPTER THREE DESIGN PRACTICES Introduction, 14 Project Planning and Road Selection, 15 Candidate Road Characterization, 17 Selection of Materials, 22 Developing and Laboratory Testing of a Job Mix Formula, 25 Application Rates, 26 Service Life, 27 Summary, 27 29 CHAPTER FOUR CONTRACTING PROCEDURES Introduction, 29 Contract Types, 29 Contract Administration, 29 Warranties, 31 Microsurfacing Contract Provisions, 33 Summary, 36 37 CHAPTER FIVE CONSTRUCTION PRACTICES Introduction, 37 Construction Process, 37 Summary, 42 43 CHAPTER SIX MICROSURFACING EQUIPMENT PRACTICES Introduction, 43 Microsurfacing Equipment Train, 43 Summary, 48

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49 CHAPTER SEVEN QUALITY CONTROL AND QUALITY ASSURANCE AND PERFORMANCE MEASURES Introduction, 49 Quality Definitions, 49 Microsurfacing Quality Requirements, 49 Quality of Microsurfacing Workmanship, 50 Microsurfacing Performance, 52 Summary, 55 56 CHAPTER EIGHT CASE STUDIES Introduction, 56 Case Study Descriptions, 56 Summary and Effective Practices, 64 65 CHAPTER NINE CONCLUSIONS Introduction, 65 Conclusions, 65 Effective Practices, 66 Future Research Needs, 66 68 REFERENCES 72 GLOSSARY AND ABBREVIATIONS 76 APPENDIX A SURVEY QUESTIONNAIRE AND RESULTS 102 APPENDIX B SPECIFICATION CONTENT ANALYSIS 105 APPENDIX C MICROSURFACING EXAMPLE CONTRACT CLAUSES, SPECIFICATIONS, AND CHECKLISTS