National Academies Press: OpenBook
« Previous: A: Diametral Test Equipment and Equations for Data Reduction
Suggested Citation:"B: Asphalt Concrete Specimen Preparation." Transportation Research Board. 1997. NCHRP Web Doc 14 Laboratory Determination of Resilient Modulus for Flexible Pavement Design: Final Report. Washington, DC: The National Academies Press. doi: 10.17226/6353.
×
Page 315
Suggested Citation:"B: Asphalt Concrete Specimen Preparation." Transportation Research Board. 1997. NCHRP Web Doc 14 Laboratory Determination of Resilient Modulus for Flexible Pavement Design: Final Report. Washington, DC: The National Academies Press. doi: 10.17226/6353.
×
Page 316

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

APPENDIX B ASPHALT CONCRETE SPECIMEN PREPARATION B -1

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

Next: C: Diametral Test Procedure for Resilient Modulus of Asphalt Concrete »
NCHRP Web Doc 14 Laboratory Determination of Resilient Modulus for Flexible Pavement Design: Final Report Get This Book
×
MyNAP members save 10% online.
Login or Register to save!
  1. ×

    Welcome to OpenBook!

    You're looking at OpenBook, NAP.edu's online reading room since 1999. Based on feedback from you, our users, we've made some improvements that make it easier than ever to read thousands of publications on our website.

    Do you want to take a quick tour of the OpenBook's features?

    No Thanks Take a Tour »
  2. ×

    Show this book's table of contents, where you can jump to any chapter by name.

    « Back Next »
  3. ×

    ...or use these buttons to go back to the previous chapter or skip to the next one.

    « Back Next »
  4. ×

    Jump up to the previous page or down to the next one. Also, you can type in a page number and press Enter to go directly to that page in the book.

    « Back Next »
  5. ×

    To search the entire text of this book, type in your search term here and press Enter.

    « Back Next »
  6. ×

    Share a link to this book page on your preferred social network or via email.

    « Back Next »
  7. ×

    View our suggested citation for this chapter.

    « Back Next »
  8. ×

    Ready to take your reading offline? Click here to buy this book in print or download it as a free PDF, if available.

    « Back Next »
Stay Connected!