U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Superpave 5 Lab Mix Design Procedure

File Language:
English


Details

  • Creators:
  • Corporate Creators:
    University of New Mexico, Albuquerque. Department of Civil Engineering
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
    NM17MSC-01
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Edition:
    Final Report July 1, 2018 – May 15, 2022
  • Corporate Publisher:
    New Mexico. Department of Transportation. Research Bureau
  • Abstract:
    The traditional Superpave (SP4) mix is designed at 4% air voids, while the mix is compacted at 7%-8% air voids in the field with the belief that the pavement will achieve 4% air voids or 96% density within a few years. However, several studies have reported that the maximum density that a pavement can achieve is about 94% or 6% air voids. Such higher air voids provide an easy pathway for air into the pavement, which eventually accelerates the aging process and results in premature cracking of the pavement. To this end, this study provides an enhanced mix design approach in which the mixes were designed at 5% air voids (SP5) and recommended to compact at the same air voids in the field so that the higher in-place density minimizes the aging process. At first, traditional SP4 mixes were designed using three different aggregates and binders. The SP5 mix design was achieved by reducing the design number of gyrations and adjusting the aggregate gradation while keeping the effective binder content as the same as in a traditional SP4 mix. Several performance tests such as: Hamburg Wheel Tracking Device (HWTD), Indirect Tension (IDT), Texas Overlay (TOT), and Semi-Circular Bending (SCB), Thermal Stress Restrained Specimen Test (TSRST) were conducted on both the designed SP4 and SP5 mixes to determine rutting and cracking performance. The HWTD test results reveal that the SP5 mix has equal or better rutting resistance properties than the SP4. Based on the fracture energy obtained from IDT, TOT, SCB test data, it was observed that the SP5 mixes exhibited better cracking resistance than the SP4 mixes. The TSRST test results indicate that the SP5 mixes have improved low-temperature cracking properties compared to the SP4 mixes. The SP5 mixes were found to have zero permeability. In summary, three SP5 mixes were designed; a modification of SP4 mix design volumetrics is suggested; and some performance criteria for designing SP5 mixes were developed in this study.
  • Format:
    PDF
  • Funding:
    456-573
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:8356e1220ea86a32e214a6d5fe4ca52c687cfcfeaeb098cae8d0d9b884f4882eb13ef364a9d45f942cb5e632ecec1abe67e55ca3103be6853e87a3f12b3d7e3f
  • Download URL:
  • File Type:
    Filetype[PDF - 4.31 MB ]
PREVIOUS
File Language:
English
ON THIS PAGE
Details
ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP