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Laboratory and Field Characterization of Micro-surfacing Mix Bond Strength

Talha, Sk Abu
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1563828986449352

Abstract Details

2019, Master of Science (MS), Ohio University, Civil Engineering (Engineering and Technology).
Current practice related to the use of tack coat prior to application of microsurfacing varies across the states to states. Few states require the use of tack coat, assuming it will allow a proper bonding at the interface between the micro-surfacing layer and existing pavement. On the other hand, the majority of the states do not use tack coat. They believe is that the consistency of the micro-surfacing mix allows it to be spread uniformly, resulting in a proper bond at the interface. However, no research has been conducted to investigate the effectiveness of tack coat on interface bond strength between the micro-surfacing layer and the existing pavement. The objective of this study was twofold. First, a laboratory test scheme was developed to characterize the bond strength between the micro-surfacing layer and the existing pavement hot mix asphalt (HMA) surface. In order to evaluate the effectiveness of tack coat, samples were prepared in the laboratory with varying tack coat application rate. Additionally, different percentages of residual binder content were also used to study the influence of residual binder content on bond strength characteristics. Two types of bonding strength tests were used including “Pull-off” and “Torque” bonding strength test. The pull-off test was carried out using two commercially available devices: 1- Proceq DY 206 and 2- Com-Ten pull off tester. A torque device was developed in the laboratory to carry out the torque tests. Secondly, a field-testing test program was4 established which include in-situ testing of the bond strength and laboratory testing of the cores collected from the field. In both cases, proceq pull-off device and torque device were used to measure the bond strength. It was observed from the laboratory prepared samples that, the mixes with tack coat had significantly higher bond strength than mixes without tack coat. In general, Similar performance was observed for mixes with different tack coat application rate. No significant trend was found between bond strength and rate of application of tack coat. However, the mix where tack coat was diluted with water, exhibited significantly lower bond strength than mixes were tack coat was not diluted with water. Overall, the failures associated with mixes where tack coat was used were more cohesive than the mixes with tack coat. For in-situ testing, a drastic reduction in bond strength was observed due to an increase in temperature of 7-9ºC. A similar trend was also observed during laboratory testing of the field cores. Besides, from the test results of field cores, a gradual increase in bond strength was observed with the increase in the number of days after construction. However, more research is needed to establish any relationship between bond strength and the number of days after construction.
Munir Nazzal (Advisor)
Sang-soo Kim (Committee Member)
Bhaven Naik (Committee Member)
Sergio Lopez-Permouth (Committee Member)
130 p.
Civil Engineering; Engineering
micro-surfacing; tack coat; bond strength; pull-off force; torque

Recommended Citations

Citations

  • Talha, S. A. (2019). Laboratory and Field Characterization of Micro-surfacing Mix Bond Strength [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1563828986449352

    APA Style (7th edition)

  • Talha, Sk Abu. Laboratory and Field Characterization of Micro-surfacing Mix Bond Strength. 2019. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1563828986449352.

    MLA Style (8th edition)

  • Talha, Sk Abu. "Laboratory and Field Characterization of Micro-surfacing Mix Bond Strength." Master's thesis, Ohio University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1563828986449352

    Chicago Manual of Style (17th edition)

ohiou1563828986449352
337
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This open access ETD is published by Ohio University and OhioLINK.