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Virginia's Higher Specification for Reclaimed Asphalt Pavement

Performance and Economic Evaluation
Authors: G. W. Maupin; Stacey D. Diefenderfer; James S. Gillespie;

Virginia's Higher Specification for Reclaimed Asphalt Pavement

Abstract

In 2007 the Virginia Department of Transportation (VDOT) decided to allow higher percentages–-more than 20%–-of recycled asphalt pavement (RAP) in hot-mix asphalt with no change in binder grade. For selected VDOT resurfacing projects in 2007, six contractors produced a total of 129,277 tons of mix containing 21% to 30% RAP from seven asphalt plants in four districts. This study estimated the effect of increased RAP percentages on performance and relative cost. Mixes from most of the high-RAP jobs were sampled and tested, as were mixes from roughly comparable jobs containing less than 20% RAP. Laboratory tests revealed no significant difference between the higher RAP mixes and the control mixes for fatigue, rutting, and susceptibility to moisture. Recovered binder was graded to determine the effect of adding higher percentages of RAP. No construction problems were attributed to the use of the mix with the higher RAP percentage. Slight price adjustments were applied to two of the 10 high-RAP projects, but these were not because of the higher RAP percentage. Price and quantity data from all contracts in the 2007 resurfacing schedule were subjected to statistical analysis. The specification allowing higher RAP percentages was found to have a small, statistically insignificant impact on the bid prices for surface mix items. Value engineering proposals received for jobs not advertised with the high-RAP specification showed that the use of more than 20% RAP could reduce costs in at least some cases.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
15
Top 10%
Top 10%
Average
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