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- W154962450 abstract "Void in mineral aggregate (VMA) has been considered as one of the most important design parameters in the current Superpave mix design procedure that links the hot mix asphalt (HMA) mix properties to its field performance. The easiness and successfulness of achieving target VMA not only significantly impact the time and effort in the HMA mix design process, but can affect the mix’s property and its field performance. Although several current mix design and gradation design methods have provided some guidance on adjusting gradation to achieve target VMA, these approaches still have to rely on initial experimental results, and provide no direct correlation between aggregate gradation and VMA. In addition, the new NCHRP 9-33 design manual suggests narrowing the VMA specification range to 2%, which makes it more important and practical to develop a simple method to estimate the VMA values for the mix design. This paper conducted an analysis of aggregate packing and DEM simulation to link the aggregate gradation property to the VMA of HMA. A gradation weighing factor, fv, defined as the percentage of voids change by volume due to unit additional aggregate, is developed to theoretically evaluate the packing of an aggregate structure, and to provide a prediction of VMA. The results are validated using eleven mix designs from different states. Most predictions are within 1% difference comparing with the design VMA. Although only based on one nominal maximum aggregate size (NMAS) of 12.5mm, this study provided a promising methodology to be used for a fast and accurate VMA prediction. It can be used directly in the HMA mix design to reduce the design time and effort, as well as to provide a more reasonable gradation and mix design." @default.
- W154962450 created "2016-06-24" @default.
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- W154962450 date "2010-01-01" @default.
- W154962450 modified "2023-09-24" @default.
- W154962450 title "Determination of HMA Voids in Mineral Aggregate Based on an Analysis of Aggregate Gradation and Packing" @default.
- W154962450 hasPublicationYear "2010" @default.
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