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Aggregate Road Surface Rejuvenation Aggregate Road Surface Rejuvenation Charles Jahren, Principal Investigator Department of Civil, Construction, and Environmental Engineering Construction Management and Technology, Institute for Transportation Iowa State University April 2015 Research Project Final Report 2015-04 To request this document in an alternative format call 651-366-4718 or 1-800-657-3774 (Greater Minnesota) or email your request to [email protected]. Please request at least one week in advance. Technical Report Documentation Page 1. Report No. 2. 3. Recipients Accession No. MN/RC 2015-04 4. Title and Subtitle 5. Report Date Aggregate Road Surface Rejuvenation April 2015 6. 7. Author(s) 8. Performing Organization Report No. Charles Jahren and Ziliang Zhang 9. Performing Organization Name and Address 10. Project/Task/Work Unit No. Institute for Transportation Iowa State University 11. Contract (C) or Grant (G) No. 2711 S. Loop Drive, Suite 4700 (c) 99004 (wo) 10 Ames, Iowa 50011-8664 12. Sponsoring Organization Name and Address 13. Type of Report and Period Covered Minnesota Department of Transportation Final Report Research Services & Library 14. Sponsoring Agency Code 395 John Ireland Boulevard, MS 330 St. Paul, Minnesota 55155-1899 15. Supplementary Notes http://www.lrrb.org/pdf/201504.pdf 16. Abstract (Limit: 250 words) Aggregate surfaced roads become coarser and coarser after a few years of service due to an inherent problem—dust emission. Fines in the surfacing material are kicked up by traffic and blown away by the wind as fugitive dust. One of the alternative rejuvenation methods is to replenish the missing fines to restore the gradation and plasticity of the in situ material. Savings in the material and cost could in return benefit the environment and financial condition of the jurisdiction. Control and experimental test sections were established in three counties of Minnesota and performance of the sections were assessed using methods including cross-section profile change surveys, gravel loss and loose aggregate measurements, gravel road condition ratings, International Roughness Index estimation, and field observations. Experimental sections in Jackson County did not perform satisfactorily. However, one of the test sections in Beltrami County performed favorably well. A five-year-cycle benefit-cost analysis revealed that a 20 percent cost savings was also achievable in that particular section. Another trial in Olmsted County tested whether modified Class 5 limestone aggregate is appropriate for gravel road surfacing. 17. Document Analysis/Descriptors 18. Availability Statement aggregate gradation, aggregate resurfacing, resurfacing, No restrictions. Document available crusher dust, fines (materials), gravel roads, gravel road from: National Technical Information maintenance, plasticity Services, Alexandria, Virginia 22312 19. Security Class (this report) 20. Security Class (this page) 21. No. of Pages 22. Price Unclassified Unclassified 130 Aggregate Road Surface Rejuvenation Final Report Prepared by: Charles Jahren Ziliang Zhang Department of Civil, Construction, and Environmental Engineering Construction Management and Technology, Institute for Transportation Iowa State University April 2015 Published by: Minnesota Department of Transportation Research Services & Library 395 John Ireland Boulevard, MS 330 St. Paul, Minnesota 55155 This report represents the results of research conducted by the authors and does not necessarily represent the views or policies of the Local Road Research Board (LRRB), the Minnesota Department of Transportation, and Iowa State University. This report does not contain a standard or specified technique. The authors, the Local Road Research Board (LRRB), the Minnesota Department of Transportation, and Iowa State University do not endorse products or manufacturers. Any trade or manufacturers’ names that may appear herein do so solely because they are considered essential to this report. Acknowledgments The researchers would like to acknowledge the Local Road Research Board (LRRB) and the Minnesota Department of Transportation (MnDOT) for sponsoring this project. The authors also want to thank the technical advisory panel (TAP) members and the various county personnel who have assisted on this project. Table of Contents 1. INTRODUCTION ...................................................................................................................... 1 Problem Statement .............................................................................................................. 1 Background ......................................................................................................................... 1 Research Approach ............................................................................................................. 2 Research Objectives ............................................................................................................ 2 Final Report Content ........................................................................................................... 2 2. LITERATURE REVIEW ........................................................................................................... 4 Surfacing Material Properties ............................................................................................. 4 Surfacing Blending Equipment and Methods ..................................................................... 4 3. RESEARCH OVERVIEW ......................................................................................................... 8 Jackson County CR 76 Test Section Layout....................................................................... 9 Beltrami County CR 23 Test Section Layout ................................................................... 11 Olmsted County CR 115 Test Section Layout .................................................................. 13 Traffic Volumes for the Test Sections .............................................................................. 14 4. RESEARCH METHODOLOGY, FIELD DATA COLLECTION, AND TEST SITE OBSERVATIONS ........................................................................................................................ 15 Laboratory Testing ............................................................................................................ 15 Field Data Collection ........................................................................................................ 15 Preconstruction Observations ........................................................................................... 19 Construction Observations ................................................................................................ 22 Maintenance Activity Timetables ..................................................................................... 30 5. RESULTS ................................................................................................................................. 31 Soil Composition Comparison .......................................................................................... 31 Jackson County ................................................................................................................. 32 Beltrami County ................................................................................................................ 39 Olmsted County ................................................................................................................ 50 Chapter Summary ............................................................................................................. 61 6. ECONOMIC ANALYSIS ........................................................................................................ 64 Cost Comparison Analysis ................................................................................................ 64 Cost Comparison Results .................................................................................................. 64 Benefit-Cost Analysis ....................................................................................................... 65 7. PERFORMANCE SUMMARIES ............................................................................................ 67 Jackson County CR 76 ...................................................................................................... 67 Beltrami County CR 23 .................................................................................................... 67 Olmsted County CR 115 ................................................................................................... 68 8. CONCLUSIONS AND RECOMMENDATIONS ................................................................... 69 REFERENCES ............................................................................................................................. 70 APPENDIX A. GRADATION RAW DATA APPENDIX B. CROSS-SECTION PROFILES APPENDIX C. STATISTICAL ANALYSIS RESULTS • Comparison of Multiple Curves • Paired t-Test Result APPENDIX D. UNPAVED ROAD CONDITION RATING SYSTEM (BELTRAMI COUNTY EXAMPLE) APPENDIX E. CONDITION RATING GRAPHS • Beltrami County CR 23 Test Section Comparisons • Jackson County CR 76 Test Section Comparisons • Olmsted County CR 115 Test Section Comparisons APPENDIX F. MATERIAL, LABOR, AND EQUIPMENT COSTS • Beltrami County CR 23 • Jackson County CR 76 • Olmsted County CR 115 APPENDIX G. AGGREGATE SAMPLE ORIGIN MAP APPENDIX H. SOIL CLASSIFICATIONS FOR 19 SAMPLE PAIRS APPENDIX I. INDEPENDENT
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