Development of a Failure Theory for Concrete

Details

• Creators:
  Kampmann, Raphael ; Roddenberry, Michelle ; Ping, Wei-Chou Virgil
• Corporate Creators:
  Florida Agricultural and Mechanical University ; Florida State University
• Corporate Contributors:
  Florida. Dept. of Transportation. Research Center
• Subject/TRT Terms:
  Compression Concrete Crack Cracking Cracking Of Concrete Pavements Failure Fracture High-speed Video Pavement Cracking Pavement Maintenance Test Video Cameras

  More +
• Publication/ Report Number:
  BDK83 977-02
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Edition:
  Final report; Sept. 22, 2008-Aug. 31, 2012.
• Corporate Publisher:
  Florida Department of Transportation
• Abstract:
  The failure behavior of concrete materials is not completely understood because conventional test methods fail to assess the
  
  material response independent of the sample size and shape.
  
  To study the influence of strength affecting test conditions, four typical concrete sample types were experimentally
  
  evaluated in uniaxial compression and analyzed for strength, crack initiation/propagation, and fracture patterns under
  
  varying boundary conditions. Both low friction and conventional compression interfaces were assessed. High-speed video
  
  technology was used to monitor macrocracking.
  
  Inferential data analysis proved reliably lower strength results for reduced surface friction at the compression interfaces,
  
  regardless of sample shape. Reciprocal comparisons revealed statistically significant strength differences between most
  
  sample shapes. Crack initiation and propagation was found to differ for dissimilar compression interfaces.
  
  The principal stress and strain distributions were analyzed, and the strain domain was found to resemble the experimental
  
  results, whereas the stress analysis failed to explain failure for reduced end confinement. Neither stresses nor strains
  
  indicated strength reductions due to reduced friction, and therefore, buckling was considered. The high-speed video analysis
  
  revealed buckling phenomena, regardless of end confinement. Slender elements were the result of low friction, and stocky
  
  fragments developed under conventional confinement. The critical buckling load increased accordingly.
  
  The research showed that current test methods do not reflect the ``true'' compressive strength and that concrete failure is
  
  strain driven. Ultimate collapse results from buckling preceded by unstable cracking.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:663619a1f650cc3c0eb3b13519d3ae4284b87e5e350e94b172b1f9fc24e4bb62
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24914/dot_24914_DS1.pdf
• File Type:
  [PDF - 82.28 MB ]