Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Help
Clear All

Query Builder

Query box

Help
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Evaluation of Voids in the Mineral Aggregate for HMA Paving Mixtures

Filetype[PDF-302.69 KB]


  • English
    • Details You May Also Like

    Details:

    • Creators:
    • Corporate Creators:
      National Center for Asphalt Technology (U.S.)
    • Subject/TRT Terms:
    • Publication/ Report Number:
      Report No. 9
    • Resource Type:
      Tech Report
    • Corporate Publisher:
      National Center for Asphalt Technology (U.S.)
    • Abstract:
      This study was undertaken (a) to reexamine the rationale behind the minimum VMA

      values currently being used, and (b) to quanti~ the relationship between various asphalt film thicknesses and the aging characteristics of the HMA mix, so that an optimum film thickness desirable for satisfactory mix durability could be established. The optimum film thickness could then be used to establish VMA requirements. Mixes prepared with asphalt binder film thickness ranging from about 4 to 13 microns, were subjected to accelerated aging using Strategic Highway Research Program (SHRP) procedures to simulate both short and long term aging. Both the aggregate (RD) and the asphalt ?Respectively, Associate Director, National Center for Asphalt Technology, and Graduate Student, Auburn University, Alabama. cement (AAM- 1 ) used in this study were obtained from the SHRP Materials Reference Library. The aged, compacted mix was tested for tensile strength, tensile strain at failure and resilient modulus. The aged asphalt cement was recovered and tested for penetration, viscosity, complex between various asphalt film thicknesses and the aging characteristics of the HMA mix, so that an optimum film thickness desirable for satisfactory mix durability could be established. The optimum film thickness could then be used to establish modulus and phase angle. Aging indices were obtained from these tests, and the relationship between film thickness and the aged mix/aged asphalt cement properties were determined using regression analysis. For the particular aggregate/asphalt cement combination used in this study, it was found that accelerated aging would occur if the asphalt binder film thickness was less than 9- 10 microns in an HMA mixture compacted to 80/0 air void content. The minimum VMA required to accommodate this optimum asphalt film thickness and 40/0 air void content, was also calculated.

    • Format:
      PDF
    • Collection(s):
    • Main Document Checksum:
    • Download URL:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at rosap.ntl.bts.gov

    Version 3.26