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Evaluation of moisture sensitivity properties of ADOT mixtures on US 93 : final report.

File Language:
English


Details

  • Creators:
    Sebaaly, Peter E. ORCID ICON IMG ; Eid, Zein ; Epps, Jon A.
  • Corporate Creators:
    University of Nevada, Reno. Department of Civil Engineering
  • Contributors:
    Scofield, Larry
  • Corporate Contributors:
    Arizona. Department of Transportation ; United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-AZ98-402-01
  • Resource Type:
    Research Paper
  • Geographical Coverage:
    United States;Arizona
  • Edition:
    Final report
  • Corporate Publisher:
    Arizona. Department of Transportation
  • Abstract:
    In 1993, the Arizona Department of Transportation (ADOT) constructed pavement test sections as part of the Long ; Term Pavement Performance (LTPP) Specific Pavement Studies (SPS). The test sections are located on US 93 north ; of Kingman, Arizona, and consist of both SPS-1 and SPS-9 experiments constructed at the same location. As early as ; 1996 it was reported that fatigue cracking was occurring in the SPS-9 Superpave sections. A field visit in 1998 by ; personnel from ADOT, LTPP, and the FHWA revealed that the SPS-9 Superpave test sections were experiencing ; premature fatigue cracking while the SPS-1 test sections which used Marshall Mix designs had not experienced any ; distress. The survey team concluded that moisture sensitivity may be the primary cause of the premature fatigue of ; the Superpave designed HMA mixtures. An investigation into this premature failure was subsequently initiated. ; This report describes the performance of the SPS-9 sections and documents the laboratory evaluation of mixtures ; and cores from the three sections in an effort to assess the appropriateness of the Superpave moisture damage ; requirements. The three evaluated sections included: a Superpave designed section with 1” nominal maximum size, a ; Superpave designed section with 3/4” nominal maximum size, and an ADOT Marshall designed section with 3/4” ; nominal maximum size. The two Superpave sections did not include anti-stripping additive based on the results of the ; Superpave moisture sensitivity testing. The ADOT section included 2% Portland Cement (PC) based on the results of ; the ADOT immersion compression test. ; This research project evaluated the moisture sensitivity of the HMA mixtures used on all three sections using a ; modified AASHTO T-283 procedure and a modified ADOT immersion compression test procedure. Laboratory ; mixtures and field cores were tested by the modified AASHTO T-283 method using both the freeze/thaw and no ; freeze/thaw conditioning methods. Three methods of compaction were used (gyratory 4- and 6-inch and Marshall 4- ; inch). ; The analysis of the data generated in this study led to the following conclusions: The moisture conditioning ; (freeze/thaw and no freeze/thaw) did not significantly impact the retained strength ratios of HMA mixtures as measured ; by the resilient modulus (Mr) and Indirect Tensile Strength (ITS) test procedures. The impact of compaction method ; on retained strength of HMA mixtures is affected by other factors such as: type of mixture and the addition of PC. ; The impact of adding PC to HMA mixtures showed mixed results depending on compaction method. The ability ; of the modified AASHTO T-283 method in assessing moisture sensitivity of HMA mixtures, with either the gyratory ; or the Marshall compaction methods, is questionable. Similarly, ADOT immersion compression test results provided ; questionable value in discriminating between acceptable and unacceptable mixes.
  • Format:
    PDF
  • Funding:
    SPR-PL-1-(47)402
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/16152/dot_16152_DS1.pdf
  • File Type:
    Filetype[PDF - 2.27 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha-512:711826fd539bc127c95f21c7bafb46e4c93f3a155f92eb4904a207228996ac8e9309d15f3ac926ede35d21ee7757bbb70a40a772db27e2b51554df51942426f7
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