Evaluation of the fatigue and toughness of fiber reinforced concrete for use as a new highway pavement design.

Details

• Creators:
  Kevern, John T. ; Rupnow, Tyson D. ; Mulheron, Matt ; Collier, Zachary ; Icenogle, Patrick
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  Louisiana. Dept. of Transportation and Development ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Fatigue (Mechanics) Fiber Reinforced Concrete Reinforced Concrete Pavements Toughness
• Publication/ Report Number:
  FHWA/LA.15/559
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana. Dept. of Transportation and Development
• Abstract:
  Concrete pavement design is currently centered on steel reinforcement, whether that reinforcement be in the
  
  form of dowel bars, as is the case in jointed plain concrete pavement (JPCP), or in the form of continuous rebar
  
  reinforcement, continuously reinforced concrete pavement (CRCP). The use of steel in concrete pavements
  
  presents durability problems due to the corrodibility of steel. This study evaluates the use of polypropylene
  
  fibrillated, polypropylene macro, carbon, and steel fibers as primary reinforcement in concrete pavements.
  
  Results showed that fiber reinforcement can be used to improve both the fatigue and toughness performance of
  
  concrete. When post-cracked strength or toughness is the concern, concrete containing more fibers and fibers
  
  with higher tensile strength are desirable. Carbon fibers maintained greater load-carrying capacity at lower
  
  deflections than the steel fibers, which produced the greatest ductility. However, toughness and fatigue
  
  performance did not correlate for small deflections, suggesting that polypropylene macro fibers may be adequate
  
  for repeated, low stress loading.
  
  This study also found that when repeated low deflections are a concern, such as many pavements, there must be
  
  sufficient fibers across a crack to maintain a tight crack. Conversely, too many fibers prevent adequate
  
  consolidation and aggregate interlock, which negatively influences performance. When considering the precracked
  
  fatigue performance of fiber reinforcement, the fibers needed to have sufficient length to reach across
  
  the crack and bond with the concrete, and that higher fiber dosages increase the fatigue performance of the
  
  concrete. The resulting pavement design, continuously fiber reinforced concrete pavement (CFRCP), will
  
  provide an alternative to JPCP and CRCP in highway pavement design that is not susceptible to durability
  
  problems associated with corrosion of the reinforcement.
  
  
• Format:
  PDF
• Alternate URL:
  http://www.ltrc.lsu.edu/pdf/2016/FR_559.pdf
• Funding:
  LTRC Project Number: 14-3C ; State Project Number: 30001504
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:efdc445a88f13a006508a154adedb117d8903b088e8eb5fe1a183c6589da7e67
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/30759/dot_30759_DS1.pdf
• File Type:
  [PDF - 1.23 MB ]