Fatigue and fracture properties of aged binders in the context of reclaimed asphalt mixes.

Details

• Creators:
  Motamed, Arash ; Nyanhongo, Solomon ; Karki, Pravat ; Bhasin, Amit
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Corporate Contributors:
  United States. Department of Transportation. University Transportation Centers (UTC) Program
• Subject/TRT Terms:
  • Reclaimed asphalt pavements
  • Asphalt mixtures
  • Binders
  • Fracture properties
  • Fatigue (Mechanics)
  • Stiffness
  • Aging (Materials)
  • Oxidation
• Publication/ Report Number:
  SWUTC/14/600451-00076-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Southwest Region University Transportation Center (U.S.)
• Abstract:
  Evidence in the literature indicates that the stiffness of the asphalt binder increases and ductility of the binder decreases ; with oxidative aging. Typically for unmodified asphalt binders, increase in stiffness or decrease in ductility is regarded ; as detrimental to the fatigue cracking or fracture resistance of the asphalt binder. However, fundamentally the stiffness ; of the binder and its strength are two different attributes that may not necessarily be related to each other. There is very ; little information in the literature that relates the fatigue cracking resistance or strength of the asphalt binder to the ; extent of oxidative aging. This information is not only important to assess the durability and cracking life of asphalt ; pavements but is also very important in the context of reclaimed asphalt pavements (RAP). The use of RAP not only ; reduces the waste produced from milling and removing the asphalt pavement layers at the end of their service life, but ; also reduces the amount of asphalt required for the construction of new roadways. In an effort to improve sustainable ; practices associated with pavement constructions, state DOTs have been gradually increasing the allowable percentage ; of RAP in new asphalt mixtures over the last two decades. However, the asphalt binder in RAP is highly oxidized and ; is deemed to be susceptible to load related fatigue cracking. The focus of this study was to investigate the effect of ; asphalt binder oxidation on its fracture properties and fatigue cracking performance. To this end, fatigue cracking ; resistance of an asphalt binder was measured at different levels of aging using a standardized glass bead composite. ; The glass bead composite simulates the stress state that asphalt binders experience in the field, while it excludes ; aggregate-asphalt binder interactions. Furthermore, this research also investigated the effect of aging on fracture ; properties of an asphalt binder by conducting monotonic fracture tests using a poker chip test geometry. The findings ; from this study provide a better understanding of the effect of aging on the fracture and fatigue properties of asphaltic ; materials.
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• Format:
  PDF
• Funding:
  DTRT12-G-UTC06
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29317/dot_29317_DS1.pdf
• File Type:
  [PDF - 1.38 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ade7102c626f90248132203ea21253ccbb775454c51ec5cea133e9822de05d2fb8077ea850334d52342929b470177316e7f8123f3794c20057dcdd56f8ad8c93