Evaluation of Bituminous Materials Used in Pavement Recycling Projects at Tyndall, Macdill, and Hurlburt Air Force Bases

摘要

This report presents results of a study involving bituminous materials from Tyndall and MacDill Air Force Bases and Hurlburt Field. These materials included Reclaimed Asphalt Pavement (RAP), modifiers, virgin asphalts, and new aggregates. A tentative modifier selection criterion was used to judge the quality of materials used in the recycling efforts at the respective sites. The results showed that independent adequacy of physical properties from chemical properties in selection of modifiers could not be established. However, some of the results showed that physical were more sensitive indicators of changes in binders due to aging. In addition, this report includes the tentative modifier selection criteria and results of an interlaboratory study from which variability limits to parameters determined using modified Clay-Gel and Heithaus procedures are established. The modified Clay-Gel and Heithaus procedures are included. Keywords: Flexible pavements, Reclaimed asphalt pavement (RAP), Open graded friction course (OGFC), Hot recycling, Aged binders, Modifiers, Compatibility, Modifier selection specification, Chemical/physical properties, Clay-Gel modified test, Heithaus solubility test, Variability limits, Pilot study, Viscosity temperature susceptibility, Asphaltenes plus saturates, Asphaltene state of peptization, Viscosity aging index, Recycled pavement performance, Recycled asphalt concrete (RAC), Marshall properties, Resilient moduli.