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- W2240632698 abstract "Asphalt technologists have long recognized the need to carefully control mixture production to ensure satisfactory in-service performance. Asphalt-aggregate mixtures that are sensitive to variables controlled during production including asphalt content (AC) and gradation, particularly percent passing the 0.075-mm sieve (p0.075), have the potential to exhibit poor performance. Typical production standard deviations for AC and p0.075 are 0.3% and 0.9%, respectively. This mixture sensitivity analysis shows that variations of this magnitude can result in significant changes in laboratory volumetrics and subsequently field rutting performance. The four basic mixtures designed for the WesTrack project were examined, including the original coarse, fine, and fine plus mixtures, and the coarse replacement mixture. Coarse-graded mixtures were more sensitive to AC, and fine-graded mixtures were more sensitive to p0.075. The replacement mixture was relatively insensitive to p0.075, and one of the fine mixtures was extremely sensitive to reductions in p0.075. Results also suggest that mixture sensitivity may affect optimum AC selection by up to 1.0% and thus impact field rutting performance. A comparison of sensitivity ratios based on a performance indicator (air voids) and measured performance (rut depths) highlighted elevated sensitivities of the coarse-graded mixtures to decreases in AC as compared to fine-graded mixtures and sensitivities of all mixtures evaluated to increases in AC. When measured sensitivities were compared to those predicted from field calibrated models, the potential for extreme sensitivity was demonstrated by errors in predicted changes in air voids that ranged from 1% to 105% due to small changes in AC or p0.075. These findings reinforce the crucial need for a mixture performance test to augment the Superpave volumetric mix design system. The conclusions drawn warrant a recommendation that mixture sensitivity analyses are needed in this mix design process. A mixture sensitivity analysis is presented that is useful for identifying sensitive mixtures and serves as an excellent field quality management tool." @default.
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- W2240632698 date "2001-01-01" @default.
- W2240632698 modified "2023-09-27" @default.
- W2240632698 title "A COMPARISON OF HMA FIELD PERFORMANCE AND LABORATORY VOLUMETRIC SENSITIVITIES (WITH DISCUSSION)" @default.
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