Evaluation of lignin as an antioxidant in asphalt binders and bituminous mixtures.

Details

• Creators:
  Hobson, Cliff
• Corporate Creators:
  Kansas. Dept. of Transportation. Bureau of Research
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Lignin
  • Antioxidants
  • Bituminous binders
  • Binders
  • Bituminous mixtures
  • Age hardening
  • Hot mix asphalt
  • Lignin
  • Oxidation
  • Antioxidant
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• Publication/ Report Number:
  FHWA-KS-16-17
• Resource Type:
  Tech Report
• Geographical Coverage:
  Kansas
• Corporate Publisher:
  Kansas. Dept. of Transportation. Bureau of Research
• Abstract:
  The chemical process of oxidative age-hardening in asphalt pavements is one of the major distresses ; leading to hot mix asphalt (HMA) pavement failure as evidenced by fatigue and thermal (low temperature) ; cracking. ; Research investigations at the Western Research Institute (WRI) prior to 2005 suggested the addition ; of lignin may reduce the oxidation rate of asphalt binder. Research efforts by Bishara, Robertson, and ; Mahoney (2006) at the Kansas Department of Transportation’s Research Chemistry Laboratory in 2005 also ; suggested the addition of lignin to asphalt binder appeared to reduce the oxidation rate of the binder, and ; therefore, had the potential to be an antioxidant for HMA pavement. ; The objective of this 2007 limited laboratory research project was to determine the potential of ; reducing the oxidation rate of HMA pavements by adding lignin to the asphalt binder used to produce the ; HMA mixture. The testing matrix for this study consisted of two binders, two basic aggregate mixtures, and ; one hardwood lignin at one concentration. Eight total mixtures with and without lignin were tested after ; long-term aging to determine if the lignin had any effects on the material properties. The test results from ; this project showed minimal differences between the lignin test specimens and the control specimens. ; Based on the results from this limited study, there is no clear evidence adding lignin to HMA ; mixtures reduces oxidation or the lignin acted as an antioxidant.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31856/dot_31856_DS1.pdf
• File Type:
  [PDF - 884.25 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:ab9144efdc798998b49cfb4012a3c5d5f8adfdf53b5b199fb620290d41db1f6c