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Performance Evaluation of Concrete Pavement Granular Subbase— Pavement Surface Condition Evaluation Final Report July 2008 Sponsored by Iowa Highway Research Board IHRB Project TR-554 Iowa State University’s Center for Transportation Research and Education is the umbrella organization for the following centers and programs: Bridge Engineering Center • Center for Weather Impacts on Mobility and Safety • Construction Management & Technology • Iowa Local Technical Assistance Program • Iowa Traffi c Safety Data Service • Midwest Transportation Consortium • National Concrete Pavement Technology Center • Partnership for Geotechnical Advancement • Roadway Infrastructure Management and Operations Systems • Statewide Urban Design and Specifications • Traffic Safety and Operations About the PGA The mission of the Partnership for Geotechnical Advancement is to increase highway performance in a cost-effective manner by developing and implementing methods, materials, and technologies to solve highway construction problems in a continuing and sustainable manner. Disclaimer Notice The contents of this report refl ect the views of the authors, who are responsible for the facts and the accuracy of the information presented herein. The opinions, fi ndings and conclusions expressed in this publication are those of the authors and not necessarily those of the sponsors. The sponsors assume no liability for the contents or use of the information contained in this document. This report does not constitute a standard, specifi cation, or regulation. The sponsors do 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. Non-discrimination Statement Iowa State University does not discriminate on the basis of race, color, age, religion, national origin, sexual orientation, gender identity, sex, marital status, disability, or status as a U.S. veteran. Inquiries can be directed to the Director of Equal Opportunity and Diversity, (515) 294-7612. Federal and state laws prohibit employment and/or public accommodation discrimination on the basis of age, color, creed, disability, gender identity, national origin, pregnancy, race, religion, sex, sexual orientation or veteran’s status. If you believe you have been discriminated against, please contact the Iowa Civil Rights Commission at 800-457-4416 or Iowa Department of Transportation’s affi rmative action offi cer. If you need accommodations because of a disability to access the Iowa Department of Transportation’s services, contact the agency’s affi rmative action offi cer at 800-262-0003. Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient’s Catalog No. IHRB Project TR-554 CTRE Project 06-250 4. Title and Subtitle 5. Report Date Performance Evaluation of Concrete Pavement Granular Subbase—Pavement July 2008 Surface Condition Evaluation 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. David White, Halil Ceylan, Charles Jahren, Thang Huu Phan, Sung Hwan Kim, Kasthurirangan Gopalakrisnan, Muhannad Suleiman 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS) Center for Transportation Research and Education Iowa State University 11. Contract or Grant No. 2711 South Loop Drive, Suite 4700 Ames, IA 50010-8664 12. Sponsoring Organization Name and Address 13. Type of Report and Period Covered Iowa Department of Transportation Final Report 800 Lincoln Way 14. Sponsoring Agency Code Ames, IA 50010 15. Supplementary Notes Visit www.ctre.iastate.edu for color PDF files of this and other research reports. 16. Abstract This research project covered a wide range of activities that allowed researchers to understand the relationship between stability, pavement distress, and recycled portland cement concrete (RPCC) subbase aggregate materials. Detailed laboratory and field tests, including pavement distress surveys, were conducted at 26 sites in Iowa were conducted. Findings show that specific gravities of RPCC are lower than those of crushed limestone. RPCC aggregate material varies from poorly or well-graded sand to gravel. A modified Micro-Deval test procedure showed that abrasion losses of virgin aggregate materials were within the maximum Micro-Deval abrasion loss of 30% recommended by ASTM D6028-06. Micro-Deval abrasion loss of RPCC aggregate materials, however were much higher than those of virgin materials and exceeded 30% loss. Modulus of elasticity of RPCC subbase materials is high but variable. RPCC subbase layers normally have low permeability. The pavement surfaces for both virgin and RPCC subbase across Iowa were evaluated to fulfill the objectives of this study related to field evaluation. Visual distress surveys were conducted to gather the detailed current pavement condition information including the type, extent, and severity of the pavement distresses. The historical pavement condition information for the surveyed field sections was extracted from the Iowa DOT’s Pavement Management Information System (PMIS). The current surface condition of existing field pavements with RPCC subbase was compared with the virgin aggregate subbase sections using two different approaches. The changes in pavement condition indices (PCI and IRI) with time for both types of pavements (subbases) were compared. 17. Key Words 18. Distribution Statement recycled Portland cement concrete—subbase materials—aggregate material— No restrictions. pavement foundation layers 19. Security Classification (of this 20. Security Classification (of this 21. No. of Pages 22. Price report) page) Unclassified. Unclassified. 94 NA PERFORMANCE EVALUATION OF CONCRETE PAVEMENT GRANULAR SUBBASE – PAVEMENT SURFACE CONDITION EVALUATION IHRB Project TR-554 CTRE Project 06-250 Principal Investigators David J. White, Ph.D., Associate Professor of Civil Engineering Halil Ceylan, Ph.D. Assistant Professor of Civil Engineering Charles Jahren, Associate Professor of Construction Engineering Muhannad T. Suleiman, Ph.D, Lecturer Department of Civil, Construction and Environmental Engineering E. Tom Cackler, P.E., Director of the National Center for Concrete Pavement Technology Research Assistants Thang Huu Phan and Sung Hwan Kim Authors David J. White, Halil Ceylan, Charles Jahren, Thang Huu Phan, Sung Hwan Kim, and Kasthurirangan Gopalakrisnan, Muhannad Suleiman Preparation of this report was financed in part through funds provided by the Iowa Department of Transportation through its research management agreement with the Center for Transportation Research and Education. Center for Transportation Research and Education Iowa State University 2711 South Loop Drive, Suite 4700 Ames, IA 50010-8664 Phone: 515-294-8103 Fax: 515-294-0467 www.ctre.iastate.edu Final Report • July 2008 TABLE OF CONTENTS ACKNOWLEDGMENTS ............................................................................................................ IX EXECUTIVE SUMMARY .......................................................................................................... XI 1. INTRODUCTION .......................................................................................................................1 1.1 Research Objectives.......................................................................................................1 1.2 Research Plan.................................................................................................................1 2. LITERATURE REVIEW ............................................................................................................5 2.1 RPCC as a Replacement Material..................................................................................5 2.2 Current Use of RPCC Materials ....................................................................................5 2.3 The Effects on Pavement Stability and Permeability ....................................................8 2.4 Material Properties.........................................................................................................9 2.5 Reported Performance Problems .................................................................................10 2.6 Iowa DOT Specification Review.................................................................................10 2.7 Data and Steps used in Pavement Condition Assessment ...........................................19 2.8 Methodology for Pavement Condition Assessment.....................................................23 3. LABORATORY INVESTIGATION ........................................................................................25 3.1 Specific Gravity ...........................................................................................................26 3.2 Sieve Analysis..............................................................................................................27 3.3 Micro-Deval Test for Material Abrasion.....................................................................33 4. FIELD INVESTIGATION OF PAVEMENT SUBBASE.........................................................37 4.1 Introduction..................................................................................................................37 4.2 Test Methods................................................................................................................38 4.3 Test Results..................................................................................................................43 5. INTERSTATE I-80 IN CEDARS