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Evaluation of tack coating practices for asphalt overlays in Nebraska.

File Language:
English


Details

  • Creators:
    Amelian, Soroosh ; Kim, Yong-Rak ORCID ICON IMG
  • Corporate Creators:
    University of Nebraska--Lincoln. Dept. of Civil Engineering
  • Corporate Contributors:
    Nebraska. Dept. of Roads
  • Subject/TRT Terms:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Nebraska;United States
  • Corporate Publisher:
    Nebraska. Dept. of Roads
  • Abstract:
    The strength of the bond between asphalt layers affects the lifespan of pavement structures. It is also a key factor ; in preventing major pavement distresses, such as slippage cracking and delamination. This research project ; evaluates and compares the effectiveness and performance of different tack coating approaches to ensure the ; proper bond strength is achieved in asphalt concrete (AC) interlayers through an experimental study. Various ; tack coat materials, including different types of emulsified asphalt and asphalt binders, at multiple application ; rates and dilution ratios were investigated. In the first part of this study, laboratory-prepared samples were used ; to evaluate the sensitivity and effectiveness of the direct shear testing (DST) method, which was selected for the ; characterization of the AC interlayers where different tack coats were treated. Then, emulsified asphalts and ; binders were applied to a field test section by varying application rates. The DST was performed under a ; monotonic loading condition at three different testing temperatures. Interlayer shear strengths were used to rank ; the performance of the tack coats. In addition, cyclic DST was conducted to investigate fatigue behavior of the ; interlayers treated with different tack coats. The parameters obtained from the monotonic DST were compared ; with the fatigue DST results. In general, the test results showed superior interlayer performance from CFS-1 and ; CRS-2P at double application rate (i.e., 0.16 gal/yd2 residual application rate) and CFS-1 at the standard ; application rate (i.e., 0.08 gal/yd2 residual application rate). Moreover, CRS-2P provided the shortest breaking ; time among all the emulsified tack coats. With regard to the correlation between the monotonic and cyclic DST ; results, the maximum shear force showed an acceptable correlation with the fatigue test results, and the interlayer ; bond energy, which can also be determined using a monotonic DST, is a good (or better) predictor of the fatiguerelated ; shear resistance of the tack coats due to its higher correlation with the fatigue test results.
  • Format:
    PDF
  • Funding:
    SPR-P1(16) M039
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/32504/dot_32504_DS1.pdf
  • File Type:
    Filetype[PDF - 8.95 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha-512:09d6855c19a84e88d71804daae535a2b3ebf0c46941cccfbe1b6bfa80e33af2eea30761001b42baaf2f44469079e2fc22b8a4dfc6ab504b7e38a9145a170a02a
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