Durability Indexes via Cantabro Testing for Unaged, Laboratory-Conditioned, and One-Year Outdoor-Aged Asphalt Concrete

Ensuring good durability is an important aspect of materials selection, mixture design and construction of asphalt pavements. Over time, asphalt durability is affected by binder aging, air voids, mixture properties, and other factors. Most durability tests are concerned with binder testing and do not consider the entire mixture (including air voids). This paper’s overall objective was to evaluate durability characteristics of dense graded asphalt mixtures using the Cantabro test for a variety of conditions. Recent efforts have shown the Cantabro test output of mass loss to be promising as a durability index for dense graded asphalt. The first key finding of this paper was that mass loss versus air voids relationships were fairly linear for the conditions tested. Air voids had appreciable effects on Cantabro mass loss, reinforcing the notion that air voids should be considered in laboratory mixture conditioning protocols. The paper’s second key finding was that the data collected emphasized the need to consider material compatibility and overall mixture characteristics for durability assessments. The paper’s final key finding was that AASHTO R30-Mixture Conditioning of Hot Mix Asphalt (HMA) simulated less than one year of outdoor aging in Mississippi (as measured by the Cantabro test), while 28 days in a 60°C oven approximated one year of outdoor aging very well.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK10 General Issues in Asphalt Technology. Alternate title: Durability Indices via Cantabro Testing for Unaged, Laboratory Conditioned, and One Year Outdoor Aged Asphalt Concrete.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Howard, Isaac L
  • Doyle, Jesse D
• Conference:
  • Transportation Research Board 94th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2015-1-11 to 2015-1-15
• Date: 2015

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 18p
• Monograph Title: TRB 94th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Aging (Materials); Air voids; Asphalt concrete; Durability; Durability tests; Hot mix asphalt; Test procedures
• Uncontrolled Terms: Dense-graded asphalt mixtures
• Geographic Terms: Mississippi
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01554086
• Record Type: Publication
• Report/Paper Numbers: 15-1366
• Files: TRIS, TRB, ATRI
• Created Date: Feb 25 2015 10:23AM