Abstract
In the design of pavement infrastructure, the flow number is used to determine the suitability of a hot-mix asphalt mixture (HMA) to resist permanent deformation when used in flexible pavement. This study investigates the sensitivity of the flow numbers to the mix factors of eleven categories of HMAs used in flexible pavements. A total of 105 specimens were studied for these eleven categories of HMAs. For each category of asphalt mixture, the variations in flow number for different contractors, binder types, effective binder contents, air voids, voids in mineral aggregates, voids filled with asphalt, and asphalt contents were assessed statistically. The results show that the flow numbers for different types of HMA used in Colorado vary from 47 to 2272. The same mix may have statistically different flow numbers, regardless of the contractor. The flow number increases with increasing effective binder content, air voids, voids in mineral aggregates, voids filled with asphalt, and asphalt content in the study range of these parameters.
Highlights
The flow number (N) is an empirical way of characterizing a hot-mix asphalt (HMA) mixture’s rutting potential
The current study was not intended to investigate the viscosity of the binder or the test temperature. Other factors such as the voids in mineral aggregates (VMA), voids filled with asphalt (VFA), effective binder content, contractors, testing time, mix gradation, and binder types were investigated
Association of State Highway and Transportation Officials (AASHTO) TP 79 [2] includes test parameters for stress, temperature, specimen conditioning, and minimum flow number criteria that were established for HMA and for warm-mix asphalt (WMA) based on the traffic level
Summary
The flow number (N) is an empirical way of characterizing a hot-mix asphalt (HMA) mixture’s rutting potential. The current study was not intended to investigate the viscosity of the binder or the test temperature Other factors such as the VMA, voids filled with asphalt (VFA), effective binder content, contractors, testing time, mix gradation, and binder types were investigated. None of the studies investigated the sensitivity of different mix factors such as such as VMA, void-filled with asphalt (VFA), effective binder content, contractors, testing time, mix gradation, and binder types on the flow number of asphalt concrete. AASHTO TP 79 [2] includes test parameters for stress, temperature, specimen conditioning, and minimum flow number criteria that were established for HMA and for warm-mix asphalt (WMA) based on the traffic level. The objectives of this study were to study the effects of mix factors such as VMA, VFA, effective binder content (Vbe), contractors, testing time, mix gradation, and binder types on the flow number of asphalt concrete
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