GEORGIA'S EXPERIENCE WITH CRUMB RUBBER IN HOT-MIX ASPHALT

In 1991, the Georgia Department of Transportation (GDOT) began to evaluate the production and placement of crumb rubber hot-mix asphalt. The crumb rubber mix (CRM) used by GDOT was produced by adding ground tire rubber to hot-mix asphalt using the wet process. A test section of CRM was placed on I-75 in Henry County, just south of Atlanta, consisting of a surface mix containing 6% crumb rubber by weight of asphalt cement (AC). The test section was evaluated from 1991 to 1995. The test section indicated that the CRM became very brittle over time, as indicated by a large increase in viscosity and decrease in penetration, and by a large amount of transverse reflective cracking. Compared with the control mix, the CRM did not reduce rutting and was more than twice as expensive to place. In addition to the test section, two contract projects were initiated using CRM. These two projects indicated that CRM could be produced and placed using conventional equipment requiring only a few modifications. On-site blending units were used to combine the crumb rubber at a dosage rate of 16% by weight of AC. Pump and metering equipment was modified to accurately meter the stiff asphalt material, and correction factors were established for determining the AC content by vacuum extraction, since some of the rubber particles were retained in the aggregate portion of the sample.

• Record URL:
  • https://doi.org/10.3141/1583-06
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=GEORGIA'S+EXPERIENCE+WITH+CRUMB+RUBBER+IN+HOT-MIX+ASPHALT&author=D.+Brown&author=D.+Jared&author=C.+JONES&author=D.+WATSON&publication_year=1997
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309061644
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1583, Aggregate, Filler, and Reutilized Materials in Asphalt Mixtures.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Brown, D R
  • Jared, D
  • JONES, C
  • WATSON, D
• Publication Date: 1997

Language

• English

Media Info

• Features: References; Tables;
• Pagination: p. 45-51
• Serial:
  • Transportation Research Record
  • Issue Number: 1583
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt content; Brittleness; Construction; Costs; Crumb rubber; Equipment; Hot mix asphalt; Pendulum tests; Performance evaluations; Reflection cracking; Rutting; Test sections; Transverse cracking; Viscosity
• Uncontrolled Terms: Construction costs; Modifications; Wet process
• Geographic Terms: Georgia
• Subject Areas: Construction; Finance; Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00741975
• Record Type: Publication
• ISBN: 0309061644
• Files: TRIS, TRB, ATRI
• Created Date: Oct 22 1997 12:00AM