TECHNICAL REPORT STANDARD PAGE 1. Title and Subtitle Evaluation of Asphalt Rubber and Reclaimed Tire Rubber in Chip Seal Applications 2. Author(s) Mostafa A. Elseifi, Md. Nafiur Rahman, Md. Tanvir Sarkar, and Hossam Abohamer 3. Performing Organization Name and Address Department of Civil and Environmental Engineering Louisiana State University Baton Rouge, LA 70803 4. Sponsoring Agency Name and Address Louisiana Department of Transportation and Development P.O. Box 94245 Baton Rouge, LA 70804-9245 5. Report No. FHWA/LA.17/660 6. Report Date April 2022 7. Performing Organization Code LTRC Project Number: 18-5B SIO Number: DOTLT1000244 8. Type of Report and Period Covered Final Report 05/2018 – 12/2021 9. No. of Pages 162 10. Supplementary Notes Conducted in Cooperation with the U.S. Department of Transportation, Federal Highway Administration 11. Distribution Statement Unrestricted. This document is available through the National Technical Information Service, Springfield, VA 21161 12. Key Words Chip seal; crumb rubber; asphalt emulsion; pavement maintenance 13. Abstract Chip sealing is a commonly used pavement maintenance technique that aims to delay pavement deterioration by reducing water infiltration and restoring skid resistance. The aim of this study was to characterize the chemical, molecular, and rheological properties of different asphalt emulsions, evaluate their laboratory performance, short-term field performance, and cost-effectiveness in chip seals prepared with different application rates and aggregate blends. The effect of rubber aggregate was also evaluated as a partial replacement for light-weight aggregate (LWA). A newly introduced tire rubber modified asphalt emulsion was evaluated that allows chip seal installation at the same temperature of a standard emulsion. Types of emulsion included a newly introduced tire rubber modified asphalt emulsion (CRS-2TR), two polymer-modified emulsion (CRS-2P and CHFRS-2P), a conventional unmodified emulsion (CRS-2), and an asphalt rubber binder (AC20-5TR). Based on laboratory and field findings of this study, tire rubber modified asphalt emulsion provided promising results and is expected to provide equivalent or superior performance in the field. However,
Evaluation of Asphalt Rubber and Reclaimed Tire Rubber in Chip Seal Applications
Jun 20, 2023
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