MARC Record from Library of Congress

LEADER: 04118cam a22004937a 4500
001 2008412277
003 DLC
005 20081009114520.0
008 080819s2008 vaua tb s000 0 eng d
010 $a 2008412277
027 $aVTRC 08-R22
035 $a(OCoLC)ocn232567662
040 $aTDG$cTDG$dDLC
042 $alccopycat
043 $an-us-va
050 00 $aTE270$b.M3788 2008
082 00 $a625.8/5$222
100 1 $aMaupin, G. W.
245 10 $aEvaluation of using higher percentages of recycled asphalt pavement in asphalt mixes in Virginia /$cG. W. Maupin, Jr., Stacey D. Diefenderfer, James S. Gillespie.
260 $aCharlottesville, Va. :$bVirginia Transportation Research Council,$c2008.
300 $aiii, 26 p. :$bill. ;$c28 cm.
490 1 $aVTRC ;$v08-R22
520 3 $aIn 2007, the Virginia Department of Transportation (VDOT) decided to allow higher percentages of recycled asphalt pavement (RAP), i.e., more than 20 percent, in hot-mix asphalt with no change in binder grade. Because of this increase, one section of the contract provisions in certain plant-mix overlay schedules around the state had to be rewritten to raise the limit on the proportion of recycled material to 30 percent from the customary 20 percent. The allowance of higher RAP percentages should result in a lower cost of asphalt mix per ton, especially given the recent rising cost of asphalt cement and virgin aggregates.The purpose of this study was to estimate the effect of increased RAP percentages on performance and relative mixture cost on specific VDOT paving projects in 2007. Projects using more than 20 percent RAP were conducted in three VDOT districts. In addition, several value engineering proposals for using increased percentages of RAP submitted by contractors were accepted and carried out in another district. Six contractors produced a total of 129,277 tons of mix containing 21 to 30 percent RAP from seven asphalt plants in four VDOT districts. Mix containing less than 20 percent RAP was also sampled and tested for comparison purposes. Laboratory tests performed on samples collected during production revealed no significant difference between the higher RAP mixes and the control mixes for fatigue, rutting, and susceptibility to moisture. Binder was recovered from asphalt mix sampled during construction and graded to determine the effect of adding higher percentages of RAP. There were no construction problems attributed to the use of the mix with the higher RAP percentage. Only slight price adjustments were applied to 2 of the 10 high-RAP projects, and these adjustments were not due to the higher RAP percentage. Analysis of bid data found that the inclusion of a contract specification that allowed the higher RAP percentages had a small, statistically insignificant impact on the bid prices for surface mix items. However, value engineering proposals received for jobs that were not advertised with the high-RAP specification showed that the use of over 20 percent RAP could reduce costs in at least some cases.
500 $a"June 2008"
504 $aIncludes bibliographical references (p. 18-19).
513 $aFinal report.
536 $aSponsored by Virginia Department of Transportation$f85364
530 $aAlso available online.
650 0 $aPavements, Asphalt$xRecycling$zVirginia.
650 0 $aWaste products as road materials$zVirginia$xEvaluation.
650 0 $aPavements, Asphalt$xPerformance$zVirginia.
650 0 $aPavements, Asphalt$zVirginia$xDesign and construction.
650 7 $aAsphalt pavements.$2trt
650 7 $aRecycled materials.$2trt
650 7 $aHot mix paving mixtures.$2trt
650 7 $aBinders.$2trt
650 7 $aValue engineering.$2trt
700 1 $aDiefenderfer, Stacey D.
700 1 $aGillespie, James S.
710 2 $aVirginia Transportation Research Council.
710 1 $aVirginia.$bDept. of Transportation.
830 0 $aVTRC (Series) ;$v08-R22.
856 41 $uhttp://www.virginiadot.org/vtrc/main/online_reports/pdf/08-r22.pdf
856 41 $uhttp://worldcat.org/oclc/232567662/viewonline$3View Online