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Abstract:In this study, Micro-Deval and L.A. Abrasion were used to evaluate the durability of 72 individual
coarse aggregates used for HMA in Maine. Aggregates used in hot-mix asphalt (HMA) must be
durable and resistant to abrasion and degradation. Material loss in HMA pavements has recently
been observed by MDOT and aggregate degradation has been hypothesized as a possible contributor.
The Micro-Deval results showed no correlation with results from the L.A. Abrasion and the range in
values was quite large. Two alternative methods of analyzing Micro-Deval were employed to
measure the change in gradation of aggregate samples. A relatively large portion of tested aggregate
sources were found to degrade significantly in the Micro-Deval test while having acceptable
AASHTO Micro-Deval loss values, this presumably due to fracturing instead of abrasion. The
weighted average method and area between curves method proved to be effective in measuring the
change in particle size distribution not captured with the Method 1 Micro-Deval loss value. In
addition, a significant influence of initial grading size was found in all of the Micro-Deval data with
finer initial gradations producing higher loss values. The alternative analysis methods for Micro-Deval are recommended for use in detecting degradation not captured by the traditional Micro-Deval
value
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