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:
  • Fiber reinforced concrete
  • Reinforced concrete pavements
  • Fatigue (Mechanics)
  • 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.
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• Format:
  PDF
• Alternate URL:
  http://www.ltrc.lsu.edu/pdf/2016/FR_559.pdf
• Funding:
  LTRC Project Number: 14-3C ; State Project Number: 30001504
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/30759/dot_30759_DS1.pdf
• File Type:
  [PDF - 1.23 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:efdc445a88f13a006508a154adedb117d8903b088e8eb5fe1a183c6589da7e67