Modified Asphalt Binders for Military Airfield Pavementsby Gary L. Anderton, US Army Engineer Waterways, Experiment Station, Vicksburg, United States,
Abstract: This report documents a laboratory-based research effort to determine the effects of asphalt modifiers and alternate binders on asphalt airfield pavements. The modified binders were tested to determine their potential for reducing pavement deformation distresses and improving rheological properties. The study was performed by the U.S. Army Engineer Waterways Experiment Station (WES). An intensive literature search was performed during the first year of the study to gather all of the available information on the modifiers currently available. This information was used to choose 14 test materials, which were tested in the laboratory during the second year of the study. Data resulting from these tests were used to choose the five most promising test materials, which were evaluated further in the third and final year of the study by more detailed laboratory tests. All laboratory mix specimens were made with the same aggregate gradations and under as near identical conditions as possible. An AC-20 grade of asphalt cement was chosen as the base asphalt for all modified asphalt blends. Asphalt mix testing consisted of indirect tensile, resilient modulus and unconfined creep-rebound tests. Asphalt binder tests included kinematic viscosity, Brookfield viscosity, penetration, and resiliency. The considerable amount of laboratory test data generated by this study would be too cumbersome to present in this paper; therefore, only the background, material descriptions, test methods and conclusions of this study will be discussed. A more detailed description of the laboratory data is found in a WES report previously published by the author (Anderton, 1990).
Subject Headings: Laboratory tests | Material tests | Asphalt pavements | Airport and airfield pavements | Binders (material) | Materials processing | Elasticity | Viscosity
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