Bailey method design for a dense asphalt concrete and its influence on permanent plastic deformations resistance.
Keywords:
Asphalt mix, Bailey method, Rut resistanceAbstract
Historically, asphalt mixes have been designed considering the professional experience and proper values of volumetric parameters, such as continuously graded aggregate (gradation curve does not have any abrupt slope change), and respecting the technical specifications limits that are related. Taking that into account the asphalt binder rheological behavior is analyzed as well as the designed mix mechanical response to modeled static and/or dynamic loads that try to simulate the field conditions. However, it has been proved that not always these initial design criteria consider all the variables that condition the granular stability of the system.
The present work develops the method proposed by Robert Bailey, from the Illinois Department of Transportation, applied to a dense asphalt mix NMPS 20 mm (HMA - D20). The method proposes to optimize the aggregate skeleton to achieve a lower rate of permanent deformations of the mixtures in service. This optimization is done considering the relation between gradation and voids changes in the mix properties. To that end Control sieves are defined, these allow a more accurate aggregate blend evaluation.
In order to show how these considerations modify the dense asphalt mix properties a comparison was done between one conventionally designed mix and one designed with the Bailey method (in both cases the optimum binder content was determined by the Marshall method). These mixes were submitted to dynamic loads at 60 °C with the Wheel Tracking Test, evaluating rut resistance in each case.
Downloads
Published
How to Cite
Issue
Section
License
The authors who publish in this journal accept the following conditions:
- The authors retain the copyright and assign to the magazine the right of the first publication, with the work registered with the Creative Commons attribution license, which allows third parties to use the published information whenever they mention the authorship of the work and the First publication in this journal.
- Authors may make other independent and additional contractual arrangements for non-exclusive distribution of the version of the article published in this journal (eg, include it in an institutional repository or publish it in a book) as long as it clearly indicates that the work Was first published in this magazine.
- Authors are encouraged and encouraged to publish their work on the Internet (for example, on institutional or personal pages) before and during the review and publication process, as it can lead to productive exchanges and a greater and faster dissemination of work Published (see The Effect of Open Access).
