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PAPERBACK list:$86.50 Web:$77.85 add to cart Rights & Permissions Free Resources Display this book on your site! Related Titles Assessment of the Performance of Engineered Waste Containment Barriers The Changing Transitions to Adulthood in Developing Countries: Selected Studies Other Related Titles NCHRP Web Doc 14 Laboratory Determination of Resilient Modulus for Flexible Pavement Design: Final Report (1997) Transportation Research Board (TRB) Web Search Builder Use this book's key terms to search within this book, across our collection, or across the Web. Skim This Chapter Skim this chapter and use this chapter's key terms to search within this book. Reference Finder Paste in your own text to find books that relate to your topic. Page 315   E-mail  Facebook  Digg  Stumble  Twitter More Page 315 Front Matter (R1-R4) Table of Contents (R5-R7) Acknowledgments (R8-R8) Abstract (R9-R9) Executive Summary (R10-R13) 1 Introduction and Research Approach (1-9) 2 Resilient Modulus Testing of Asphalt Concrete (10-96) 3 Resilient Modulus Evaluation of Aggregate Base and Subgrade Materials (97-250) 4 Significant General Findings (251-277) 5 Summary, Conclusions and General Recommendations (278-285) References (286-294) A: Diametral Test Equipment and Equations for Data Reduction (295-314) B: Asphalt Concrete Specimen Preparation (315-316) C: Diametral Test Procedure for Resilient Modulus of Asphalt Concrete (317-334) D: Repeated Load Test System Calibration (335-342) E: Test Procedure for Resilient Modulus of Unstabilized Aggregate Base and Subgrade Materials (343-386) F: Effect of Laboratory Testing Variability on Pavement Thickness (387-396) G: Specimen Preparation of Cohesive Soil (397-406) H: Multi-Lab Validation Study (407-434) I: Comparison of Laboratory and Backcalculated Resilient Moduli (435-440) J: Effect of Diametral Test Variables (441-456)

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APPENDIX B ASPHALT CONCRETE SPECIMEN PREPARATION B -1

OCR for page 316
APPENDIX B: ASPHALT CONCRETE SPECIMEN PREPARATION Watsonville granite aggregate and Valley AR-4000 grade asphalt were used for the asphalt concrete mix. Two different gradations, medium and coarse, were used during the course of this study and are descnbed in Table B.~. Table B. ~ . Medium and Coarse Gradations Percent Retained on Each Sieve by Weight Sieve Size Medium Gradation Coarse Gradation ~ in. 0 0 3/4 in. 5 10 I/2 in. 16 iS 3/S in. 12 12.5 No. 4 20 20 No. ~14 13 No. 16 I} 10 No. 30 ~9 , No. 50 5 2 No. 100 5 3 Pan (passing No. 100) 4 2.5 , . The aggregates were heated overnight at the mixing temperature of 284°F. The asphalt was heated until the mixing temperature was achieved, the maximum allowable time of heating not exceeding 3.5 hours. Mixing time of 4 minutes was used. Optimum asphalt contents of 4.9 and 4.7 percent were used for mixing for medium and coarse gradation samples, respectively. After mixing the specimen was cured at 140°F for 15 hours and then stored at room temperature. Before compaction the mix was placed at a temperature of 240°F until it reached uniform temperature (normally within 1.5 hours). The mix was discarded if it was not used within 3 to 3.5 hours. Specimens were compacted by a Gyratory Testing Machine (GTM) to achieve 4 + 0.5 percent air voids. B-2

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mixing temperature