Enhancing the Durability of Asphalt Pavements: Papers from a Workshop

Abstract

Preface n the past several years, there have been a number of significant advances in asphalt materials and construction techniques for increasing the durability of pavements. This e-circular contains papers based on a Sunday workshop at the 92nd Annual Meeting of the Transportation Research Board in Washington, D.C., on enhancing the durability of asphalt pavements. The workshop focused on new design and construction approaches for extending pavement life while also improving their sustainability. The workshop also addressed the use of new materials, methods of mix analysis and cracking models, coupled with specific construction techniques that can significantly increase the life of the asphalt pavement. Furthermore, it covers actual application of these materials and approaches and some associated long-term benefits. The most significant outcome of this workshop was to show that these materials and approaches are readily available in the marketplace today and only require some relatively minor changes to specifications.-Frank Fee Frank Fee, LLC

Influence of Compaction Energy on the Mechanical Performance of Hot Mix Asphalt with a Reclaimed Asphalt Pavement (RAP) and Rejuvenating Additive

“…For a specific percentage of air voids, it can be increased by reducing the applied densification effort. This results in increased voids in the mineral aggregate (VMA) and, therefore, provides sufficient space to accommodate a thicker asphalt film between the mineral aggregates, promoting cohesive properties and flexible behavior [35][36][37].…”

Role of Aggregate Gradation in Balancing the Performance of Asphalt Concrete Mixtures

“…The Superpave mix design method, implemented under the Strategic Highway Research Program (SHRP), has been used routinely to proportion asphalt concrete (AC) mixes (1). As the Superpave mix design relies on the volumetric properties and a target density to determine the quality of an AC mixture, it may not provide sufficient information relating to its engineering performance (2)(3)(4)(5). The increase in the use of recycled materials, additives and modified binders has necessitated alternative approaches to the design and selection of mixtures.…”