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- W2249464384 abstract "Superpave aggregate qualifications includes the fine aggregates angularity (FAA). The numerical value of the FAA is the voids in the mineral aggregate of the loosely packed fine aggregate. Use of FAA has been predicated on the philosophy that higher and lower values of FAA represent fine aggregate that will exhibit high and low internal friction, respectively. The amount of friction depends on the aggregate particle shape and texture. Higher internal friction is associated with increases rutting resistance. Fine aggregate angularity levels used in the Superpave system are below 40, 40 to 45 and above 45. The higher values are specified for layers near the surface and for higher traffic levels. Past and current experience shows that there are fine aggregates in mixtures performing well that are below the specified levels. There are also aggregates above the these levels in mixtures that are not performing as desired. A study has been conducted using the Purdue University laboratory wheel (PURWheel) tracking device to develop performance-based data on mixtures with various fine aggregates. A single asphalt (PG 64-22) and a 9.5-mm coarse aggregate were used in the study. The coarse aggregate was selected to emphasis the fine aggregate performance. Six fine aggregates were used with FAA ranging from 39 to 49. In addition, two of these aggregates were blended in various proportions to produce blends with FAA values of 43, 45 and 46. Wheel track tests successfully delineated potential performance of the mixtures studied. Test results show that FAA alone may not be adequate to evaluate the contribution of fine aggregate to the mixture performance. Other factors including gradation, absorption, affinity for asphalt, etc. would also affect mixture performance." @default.
- W2249464384 created "2016-06-24" @default.
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- W2249464384 date "1999-01-01" @default.
- W2249464384 modified "2023-09-24" @default.
- W2249464384 title "REVIEW OF FINE AGGREGATE ANGULARITY REQUIREMENTS IN SUPERPAVE" @default.
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