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Laboratory Evaluation of Interface Bond Strength between Asphalt Layers

Thapa, Bimal
http://rave.ohiolink.edu/etdc/view?acc_num=akron1500373006147661

Abstract Details

2017, Master of Science in Engineering, University of Akron, Civil Engineering.
A typical flexible pavement structure used by the Ohio Department of Transportation (ODOT) consists of several layers, including the subgrade, aggregate base, asphalt concrete base, intermediate course, and surface course. A light application of an asphaltic material, referred to as tack coat, is commonly used between the asphalt layers to distribute the stresses between the layers. The objective of this study was to evaluate the interlayer bond strength resulting from the use of three tack coat materials (SS-1h, rubberized tack, and non-tracking tack) commonly used in Ohio. The interface bond strength of laboratory-prepared samples was measured using a specialized fixture developed by Pine Test Equipment, Inc. that allows loading the samples in shear until failure along the interface. This study investigated the effect of the specimen diameter (4-inch and 6-inch), tack coat application rate (0.04 gallon/yd2 and 0.1 gallon/yd2), testing temperature (20°C and 25°C), and loading rate (0.1 inch/min and 2 inch/min) on the interface bond strength. The rheological properties of the three tack coat materials were also evaluated in accordance with AASHTO T 59-09. The highest interface bond strength was observed for the non-tracking tack, followed by the SS-1h and the rubberized tack, which were found to have comparable bond strengths to laboratory samples prepared with no tack coat. The optimum tack coat application rate was found to be dependent on the tack coat material type and the testing conditions (i.e., testing temperature and loading rate). A decrease in the interface bond strength was observed for the rubberized tack with the increase in the tack coat application rate, while an increase in the interface bond strength was noticed for SS-1h and the non-tracking tack with the increase in the tack coat application rate. In general, comparable results were obtained using the 4-inch and the 6-inch samples. As expected, higher interface bond strength was observed at the lower testing temperature for all samples. In addition, a higher interface bond strength was obtained for all samples when using the faster loading rate of 2 inch/min.
Ala R. Abbas, Dr. (Advisor)
Junliang Tao, Dr. (Committee Member)
Zhe Luo, Dr. (Committee Member)
69 p.
Civil Engineering
Tack Coat; Bond Strength; Pavement; Asphalt Emulsion

Recommended Citations

Citations

  • Thapa, B. (2017). Laboratory Evaluation of Interface Bond Strength between Asphalt Layers [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1500373006147661

    APA Style (7th edition)

  • Thapa, Bimal. Laboratory Evaluation of Interface Bond Strength between Asphalt Layers. 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1500373006147661.

    MLA Style (8th edition)

  • Thapa, Bimal. "Laboratory Evaluation of Interface Bond Strength between Asphalt Layers." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1500373006147661

    Chicago Manual of Style (17th edition)

akron1500373006147661
484
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This open access ETD is published by University of Akron and OhioLINK.