United States Department of Transportation
i
Development of a Guideline for the Selection of Tack Coats in South Dakota [Research Brief]
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2022-07-01
[PDF-464.92 KB]
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Abstract:Pavement failures have been reported in Upper Great Plains and Intermountain West regions, and particularly in South Dakota, with a primary cause of insufficient or excessive tack coat application and moisture penetration in the interface of two layers. Researchers have addressed these issues by helping develop a database to assist pavement engineers select the appropriate tack coat type and application rate. Tack coat binder is much softer shortly after construction compared with after aging during its in-service life, which raises the likelihood of early-age interlayer shear failure. This study was undertaken to evaluate the effects of tack coat type (CRS-2P, CSS-1h, and SS-h); application rate (0, 0.140, 0.281, and 0.702 L/m2); surface texture (grooved Portland cement concrete [PCC] and new, aged and worn, and milled hot-mix asphalt [HMA]); and freeze–thaw (F-T) cycles on early-age interlayer shear strength (ISS) of laboratory-compacted samples.
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