United States Department of Transportation
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Development of a Performance-Related Test for Designing Seal Coats: Final Report
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2023-01-01
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[PDF-84.38 MB]
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Alternative Title:Development of a Performance-Related Test for Designing Seal Coats [Project Title from Cover]
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Edition:Final Report
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Abstract:TxDOT’s seal coat program is critical to preserving its existing roadway infrastructure and ensuring roadways retain adequate skid resistance. However, sometimes seal coats fail prematurely due to factors such as incompatibility between aggregate and binder and/or binder that has poor durability while meeting other specification requirements. Seal coat design methods focus on the application rates and volumetric approaches to ensure that they are optimal. However, these methods typically do not address the compatibility of and adhesion between binder and aggregate. The overall goal of this project was to identify and develop a laboratory test(s) that can be used to evaluate the expected binder-aggregate adhesion performance and as a screening tool for any seal coat project based on its specific materials (aggregate and asphalt binder or emulsion). The study used modifications of a Sweep Test and Vialit Test to measure seal coat aggregate adhesion and performed these tests in multiple experiments to investigate the effects of binder type, dust, certain types of binder modifiers, and liquid antistrip agents on adhesion characteristics using four different aggregates mineralogies. The lab testing program and a field section evaluation indicated that the Sweep Test best evaluates the binder-aggregate adhesion. The testing also lead to recommended limits for aggregate loss.
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