Optimizing Crumb Rubber Modifiers (CRM) and Reclaimed Asphalt Pavements (RAP) in Typical Ontario Hot Mix Asphalt

Genuine sustainability begins with reduction enhanced by a culture of reusing and recycling waste materials. Rather than destroy or discard scrap rubber tires and Reclaimed Asphalt Pavement (RAP) in landfills, both materials have been successfully engineered to improve the mechanical properties of Hot Mix Asphalt (HMA) mixtures. These waste materials are used by select transportation agencies in Canada. However, in comparison to current supply, the percentage used in Ontario is rather conservative. The objective of this paper is to evaluate the use of higher percentages of Crumb Rubber Modifiers (CRM), a by-product of scrap rubber tires, and RAP in typical Ontario HMA. This paper uses the Superpave mix designs system to characterize and compare the low-temperature cracking performance of RAP and CRM in HMA. The effects of the different binder grades, RAP content, and CRM incorporation methods on the fracture parameters of the HMA mixtures are examined. The influence of mix volumetric, aggregate gradation, binder aging, and laboratory compaction method were also observed. Test results demonstrate that the wet-process of incorporating CRM in HMA is effective, and that typical Ontario HMA mixtures incorporating high RAP and CRM percentages can withstand thermal cracks arising from low temperatures. (A) For the covering abstract of this conference see ITRD record number 201402RT334E.

• Corporate Authors:

  Canadian Technical Asphalt Association

  ,   United States 
• Authors:
  • AMBAIOWEI, DC
  • TIGHE, SL
• Conference:
  • PROCEEDINGS OF THE FIFTY-EIGHTH ANNUAL CONFERENCE OF THE CANADIAN TECHNICAL ASPHALT ASSOCIATION (CTAA): ST. JOHN'S, NEWFOUNDLAND AND LABRADOR, NOVEMBER 2013
• Publication Date: 2013

Language

• English

Media Info

• Pagination: p. 139-52
• Monograph Title: Proceedings of the Fifty-Eighth Annual Conference of the Canadian Technical Asphalt Associatio (CTAA): St. John's, Newfoundland and Labrador, November 2013

Subject/Index Terms

• TRT Terms: Admixtures; Bituminous mixtures; Conferences; Cracking; Evaluation; Hot coated materials; Mix design; Recycling; Rubber; Temperature; Tires
• Geographic Terms: Canada
• ITRD Terms: 4736: Admixture; 4967: Bituminous mixture; 8018: Canada; 8525: Conference; 5211: Cracking; 9020: Evaluation (assessment); 4997: Hot coated material; 4714: Mix design; 4573: Recycling (mater); 7494: Rubber; 6722: Temperature; 1381: Tyre
• Subject Areas: Vehicles and Equipment; I31: Bituminous Binders and Materials; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 01518087
• Record Type: Publication
• Source Agency: Transportation Association of Canada (TAC)
• Files: ITRD, TAC
• Created Date: Mar 11 2014 11:01AM