Implementation of GPC characterization of asphalt binders at Louisiana materials laboratory.

Details

• Creators:
  Daly, William H. ; Negulescu, Ioan ; Balamurugan, Sreelatha S.
• Corporate Creators:
  Louisiana State University. Dept. of Chemistry
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Gel permeation chromatography
  • Asphalt cement
  • Crumb rubber
  • Binders
  • Polymer asphalt
  • Solvents
• Publication/ Report Number:
  FHWA/LA.13/505
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana. Dept. of Transportation and Development
• Abstract:
  This research implemented a procedure for using gel permeation chromatography (GPC) as an analytical tool to ; define the percentage amounts of polymer modifiers, which are soluble in eluting GPC solvents, in polymermodified asphalt cements. It also addressed quantification of both GPC solvent soluble and insoluble crumb ; rubber present in crumb rubber modified binders. Attention was also paid to using GPC for assessment of the ; extent of oxidative rolling thin-film oven ( RTFO) and pressure aging vessel (PAV) aging of a series of asphalt ; binders as well as forensic analysis of pavement failures. ; The project was sub-divided into two phases including (I) purchasing, installing and calibrating a GPC instrument ; at the DOTD Materials Laboratory and writing detailed procedures for conducting binder analysis to determine ; the percent polymer content in polymer modified binders and (II) developing an efficient extraction process ; capable of recovering binder from asphalt cement cores. Phase I included the GPC analysis of different polymers ; and binders, and a quantitative estimation of polymers, asphaltenes, and maltenes present in the analyzed binders. ; At DOTD, a large number of binders from various asphalt sources and polymer additives have been analyzed. ; Over 180 samples of PG 64-, PG 67-, PG 70-22m and PG 76-22m grades were subjected to GPC analysis and the ; polymer percentage was calculated and compiled. Phase II extended the development of a procedure to define the ; percent amounts GPC solvent insoluble crumb rubber present in CRM binders. It included a comparison between ; the extraction of soluble CRM species with a blend of toluene-ethanol (85:15 volumetric ratio) and bromopropane ; at room or moderate temperatures. Since similar results have been obtained, due to the fact that bromopropane is ; more expensive than toluene and ethanol, the toluene/ethanol mixture appears to be a better option, especially for ; large scale extractions. An AASHTO standard test method for the quantification of polymer content in polymer ; modified asphalt cements by GPC has been proposed.
  More +
• Format:
  PDF
• Funding:
  LTRC Project Number: 10-6B ; State Project Number: 736-99-1716
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/22269/dot_22269_DS1.pdf
• File Type:
  [PDF - 1.09 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:bc6b6cfb795814030fe468aeee195785cc709bac3c67a0e6a2537e31dfba087c5f0431cb0906b99e352d3e1ca25f74ef12f64bf05665e24619a9d0e08f3b7a28