Characterization of Unmodified and SBR Latex-Modified Evotherm Warm Mix Binder

The Evotherm warm mix process developed by MeadWestvaco is the direct substitution of asphalt binder with a cationic asphalt emulsion. This paper, from the proceedings of the 52nd Annual Conference of the Canadian Technical Asphalt Association (CTAA), describes the development of a procedure to recover the representative emulsion residue for the Evotherm warm mix system. Field trials by McAsphalt in Canada have demonstrated a 30°C and 60°C reduction in the mixing and compaction temperatures, respectively, when compared to conventional hot mix using the same aggregate and asphalt. The process entails approximately 80g of Evotherm emulsion which is poured into a Thin-Film Oven Test (TFOT) pan and dried in a forced air oven at 80°C for 20 hours. The study used both conventional and Superpave binder characterization testing to show that the recovery procedure developed here closely simulates the heat history that the Evotherm emulsion is exposed to during mixing and paving in the field. The tests also support the conclusions pavement constructed using unmodified Evotherm warm mix binder after 10-15 years of inservice life would be as flexible as freshly-placed conventional hot mix pavement. The polymer network formed in the SBR (styrene-butadiene-rubber) latex-modified Evotherm residue does not prevent oxidation of the asphalt binder, but rather reduces the net effect of undesired changes in rheological properties of the asphalt binder upon age or oxidative hardening. The authors conclude that modification with SBR latex polymer will further prolong the service life of the Evotherm warm mix asphalt pavement.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0921317670
• Corporate Authors:

  Polyscience Publications

  P.O. Box 1606, Station St Martin
  Laval, Quebec  Canada  H7V 3P8
• Authors:
  • Davidson, J Keith
  • Lubbers, Christopher
  • Takamura, Koichi
• Conference:
  • Fifty-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA)
  • Location: Niagara Falls Ontario, Canada
  • Date: 2007-11-18 to 2007-11-21
• Publication Date: 2007

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 297-324
• Monograph Title: Proceedings of the Fifty-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA)

Subject/Index Terms

• TRT Terms: Asphalt emulsions; Asphalt pavements; Asphalt tests; Bituminous binders; Durability; Durability tests; Field tests; Hot mix asphalt; Oxidation; Pavement performance; Polymers; Rheological properties; Service life; Styrene butadiene rubber; Warm mix paving mixtures; Waste products (Materials)
• Identifier Terms: Evotherm
• Subject Areas: Construction; Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 01117726
• Record Type: Publication
• ISBN: 0921317670
• Files: TRIS
• Created Date: Dec 30 2008 12:35PM