LABORATORY EVALUATION OF CRUMB RUBBER MODIFIED MIXTURES DESIGNED USING TXDOT MIXTURE DESIGN METHOD

The Texas Department of Transportation has developed a mixture design procedure for crumb rubber modified (CRM) asphalt concrete mixtures. Eight CRM mixtures were designed using this procedure. Four wet process mixtures and four dry process mixtures, in addition to one control mix, were considered for material characterization and performance evaluation using the asphalt aggregate mixture analysis system (AAMAS). The control mixture was designed using the conventional design method. It was determined that CRM has the potential to significantly improve the fatigue cracking performance of asphalt concrete pavements, but only when the wet method is used and the binder is properly designed. The dry process should produce mixtures with a reduced propensity for rutting, but may have an adverse effect on cracking. Fine and coarse rubber can be added dry to the dense graded mix (0.5% by weight of aggregate) without having any adverse effects on the performance. Although state transportation departments must comply with the existing legislative requirements, tire rubber, like any additive, should be used only to address a given mixture deficiency or expected deficiency in a given situation.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1995/1515/1515-001.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=LABORATORY+EVALUATION+OF+CRUMB+RUBBER+MODIFIED+MIXTURES+DESIGNED+USING+TXDOT+MIXTURE+DESIGN+METHOD&author=S.+Rebala&author=C.+Estakhri&publication_year=1995
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03611981
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1515, Recycled Tire Rubber and Other Waste Materials in Asphalt Mixtures. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Rebala, Sekhar R
  • Estakhri, Cindy K
• Publication Date: 1995

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 1-10
• Monograph Title: Recycled tire rubber and other waste materials in asphalt mixtures
• Serial:
  • Transportation Research Record
  • Issue Number: 1515
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt concrete; Cracking; Crumb rubber; Laboratory tests; Mix design; Performance evaluations; Properties of materials; Rutting
• Uncontrolled Terms: Dry process; Materials characterization; Wet process
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00715658
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: Jan 26 1996 12:00AM