United States Department of Transportation
i
Development of a Procedure for Evaluating and Approving Liquid Anti-Strip Agents
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2020-06-01
[PDF-4.24 MB]
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Edition:Final Report, June 2018–June 2020
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Abstract:The objectives of this project were to determine the extent to which liquid anti-strip agents (ASAs) can affect asphalt mixture stability during and after construction, determine the effective laboratory methods/procedures to evaluate asphalt mixture stability, and develop an approval system for liquid ASA with respect to mixture stability. The project initiated with a review of the literature on the use of liquid ASA in asphalt pavements, protocols used to evaluate and approve their use, need, and dosage, and their effects on asphalt mixture stability during and after construction. The experimental plan involved (1) the Superpave gyratory compaction of four control and sixteen liquid ASA-treated mixtures to identify stability parameters from compaction data and (2) two control and eight liquid ASA-treated mixtures to identify stability parameters from five types of tests conducted after compaction. Results showed liquid ASA-treated mixtures were softer and less resistant to shear than control mixtures, and that shear energy and compactability energy indices measured from compaction curves and shear strength measured from a newly developed IDEAL shear rutting test were able to evaluate asphalt mixture stability. An approval system for liquid ASA was developed for evaluating the effectiveness of liquid ASA in terms of asphalt mixture stability during and after construction.
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