ASPHALT MIXTURES WITH IMPROVED RESISTANCE TO DEFORMATION USING EVA MODIFIED BINDERS . 5TH CONFERENCE ON ASPHALT PAVEMENTS FOR SOUTHERN AFRICA (CAPSA 89). PROCEEDINGS HELD IN SWAZILAND, 5-9 JUNE, 1989

Copolymers of Ethylene and Vinyl Acetate (EVA) are shown to offer an effective means of modifying the rheological properties of conventional penetration grade bitumens. Thereby enabling the production of high quality asphalt mixtures with improved resistance to permanent deformation under heavy traffic and at elevated temperatures. A number of different EVA copolymers have been evaluated and their effects on bitumen properties has been determined by measuring Penetration (25 deg C) and Softening Point ring and ball (R & B) values for both the modified and unmodified binders. All grades of EVA copolymer investigated were found to improve binder properties, the degreee of modification, in particular improvements in Softening Point (R & B) values varied considerably from one EVA grade to another. Differences are related to the Vinyl Acetate content and molecular weight of the EVA copolymer used, and the EVA concentration. Both continuously graded and gap-graded asphalt mixtures containing EVA modified binders have been evaluated by means of the Marshall and Wheel-Tracking test procedures. Mixtures containing EVA modified binders gave superior performance in terms of resistance to permanent deformation compared to conventional bitumens, particularly at elevated test temperatures. Strong correlations were found to exist between the Wheel-Tracking performance of mixtures and the Softening Point (R & B) of the modified binder used.(A) For the covering abstract of the conference see IRRD 828827.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0620143959
• Corporate Authors:

  CAPSA

  PO BOX 993
  Manzini,   Swaziland 
• Authors:
  • Choyce, P W
  • Woolley, K G
• Publication Date: 1989

Language

• English

Media Info

• Pagination: p. 1-6
• Serial:
  • Publication of: CAPSA
  • Publisher: CAPSA

Subject/Index Terms

• TRT Terms: Acetates; Binders; Bitumen; Conferences; Deformation; Durability; Improvements; Marshall test; Polymerization; Polyvinyl chloride; Properties of materials; Rutting; Softening point; Test procedures; Wearing course (Pavements)
• Uncontrolled Terms: Laying; Modifications
• Subject Areas: Data and Information Technology; Highways; Materials;

Filing Info

• Accession Number: 00604041
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 0-620-14395-9
• Files: ITRD, TRIS
• Created Date: Feb 28 1991 12:00AM