RAPID OXIDATIVE AGING OF BINDER USING MICROWAVE ENERGY. AN IMPROVED METHOD

This work describes a simple procedure for aging of road binder. In a single step, the neat (virgin), unmodified binder is irradiated by microwaves to give a product equivalent to that produced by both the Rolling Thin Film Oven Test (RTFOT) followed by the Pressure Aging Vessel (PAV). The one-step approach, besides simplicity, eliminates the need for solvent to clean the RTFOT vessels. At 147 degrees C and 3080 kPa air pressure, the microwave radiation simulates "RTFOT + PAV" aging in 4.5 hr (as opposed to 1.5 hr for RTFOT + 20 hr for PAV, in addition to the time of transfer). Microwave aging allows aging and testing in the same day. The proposed method is therefore competitive with the aging techniques of ASTM: D2872-96 and AASHTO PP1. Microwave aging was tested on the eight SHRP core asphalts. According to ASTM C670, the variation of six measurements of G*sin d (expressed as a percent of their mean) for asphalt AAF-1 (4.9 percent) was much smaller than the acceptable range of variation (31.6 percent). For S and m, again the variation (3.2 and 1.7 percent) was smaller than the acceptable range of variation (12.8 and 5.6 percent, respectively). This reflects the high repeatability of microwave aging. For the covering abstract see ITRD E107185.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9080288438
• Corporate Authors:

  FOUNDATION EURASPHALT

  PO BOX 255
  BREUKELEN,     3620 AG
• Authors:
  • Bishara, Safwat W
  • Robertson, R E
  • MAHONEY, D
• Conference:
  • PROCEEDINGS OF THE PAPERS SUBMITTED FOR REVIEW AT 2ND EURASPHALT AND EUROBITUME CONGRESS, HELD 20-22 SEPTEMBER 2000, BARCELONA, SPAIN. BOOK 2 - SESSION 2
• Publication Date: 2000

Language

• English

Media Info

• Features: References;
• Pagination: p. 27-36

Subject/Index Terms

• TRT Terms: Aging (Materials); Binders; Oxidation; Tests; Waves
• Uncontrolled Terms: Micro
• ITRD Terms: 5292: Ageing; 4948: Binder; 9045: Micro; 7157: Oxidation; 6255: Test; 6767: Wave
• Subject Areas: Materials;

Filing Info

• Accession Number: 00804245
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 90-802884-3-8
• Files: ITRD, ATRI
• Created Date: Jan 5 2001 12:00AM