Experimental Investigation of Performance of Tack Coats

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Nabaei, Fatemeh | 2017

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 49582 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Tabatabaee, Nader
Abstract:
In this study performance of tack coat (thin layer bonding asphalt concrete layers) was evaluated. The shear strength of tack coat layer was considered as its measure of performance. Direct shear tests were conducted on two layered HMA specimens. The test variables included the type of tack coat material, application rate (amount of residual bitumen per unit area), substrate condition, normal stress and shear loading rate. Four types of liquid asphalt (CSS, CRS, modified CRS and MC-250) were applied as tack coat. Three substrates conditions were used in the tests. These were 3-days old, 17-days old and long term aged substrates were used. It was found that optimum application rate depends not only on the substrate condition but also on type of tack coat. The CSS emulsion used in this research yielded highest shear strength and had the least optimum application rate. The more substrate was aged, the more application rate it needed. A power relationship between the shear rate and the shear strength, and a linear relationship between the normal stress and the shear strength were observed
Keywords:
Asphalt Emulsion ; Experimental Investigation ; Tack Coat ; Interlayer Shear Strength ; Application Rate

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