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Conference proceeding
Feasibility of Using Crumb Rubber Modifier in Lieu of Grade Bumping for High Percent Reclaimed Asphalt Pavement (RAP) Mixtures In Michigan
TRB 94th Annual Meeting Compendium of Papers, Vol.Accession Number: 01552970
Transportation Research Board 94th Annual Meeting (Washington DC, United States, 01/01/2015–01/15/2015)
01/2015
Abstract
The use of recycled/reclaimed asphalt pavement (RAP) provides not only economic but also environmental benefits. However, increasing the percentage of RAP in a new asphalt pavement may hinder the economic benefits due to the necessity of expensive softer binders used to compensate for RAP stiffening effect. Alternatively, this problem may potentially be overcame by use of another recycled material; crumb rubber (CR). In this study, the thermal and fatigue cracking performances of the mixtures prepared with rubberized, soft and base binders were compared. The crumb rubber modification methods and binders included in this study were (i) devulcanized rubber, (ii) crumb rubber terminally blend, (iii) crumb rubber wet process, (iv) soft binder (PG 58-34) and (v) base binder (PG 58-28). The results of the fatigue tests indicated that all crumb rubber modified asphalt mixtures made with the base binder (PG58-28) outperformed the mixture made with grade bumped (PG58-34) binder. Similar results were observed in low temperature cracking tests. These results indicated that the crumb rubber modified binders can be used in lieu of grade bumping in high RAP mixtures. In fatigue cracking tests, among the three crumb rubber technologies, wet process outperformed terminally blend and devulcanized rubber at high temperatures and high strain levels at low temperatures. At relatively low strain levels, terminally blend was the best performer in low temperature. In low temperature cracking tests, devulcanized rubber exhibited highest tensile strength, but lowest fracture energy. Wet process exhibited highest fracture energy and lowest strength.
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Details
- Title
- Feasibility of Using Crumb Rubber Modifier in Lieu of Grade Bumping for High Percent Reclaimed Asphalt Pavement (RAP) Mixtures In Michigan
- Publication Details
- TRB 94th Annual Meeting Compendium of Papers, Vol.Accession Number: 01552970
- Resource Type
- Conference proceeding
- Conference
- Transportation Research Board 94th Annual Meeting (Washington DC, United States, 01/01/2015–01/15/2015)
- Publisher
- The National Academies of Sciences, Engineering, and Medicine
- Identifiers
- 99380467293206600
- Academic Unit
- Hal Marcus College of Science and Engineering ; Mechanical Engineering