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:
  • Concrete
  • Pavement maintenance
  • Failure
  • Cracking
  • Pavement cracking
  • Cracking of concrete pavements
  • Compression
  • Video cameras
  • Concrete
  • Failure
  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.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24914/dot_24914_DS1.pdf
• File Type:
  [PDF - 82.28 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:663619a1f650cc3c0eb3b13519d3ae4284b87e5e350e94b172b1f9fc24e4bb62