CRITICAL NORMAL FRACTURE STRAIN OF PLAIN AND STEEL WIRE FIBROUS-REINFORCED CONCRETE

RESULTS OF A SERIES OF EIGHTY-ONE IMPACT TESTS PERFORMED ON 5.1 X 88.9-CM (2.0 X 35.0-IN.) CYLINDRICAL TEST SPECIMENS ARE PRESENTED. THE CYLINDERS CONSISTED OF EITHER PLAIN OR STEEL WIRE FIBROUS-REINFORCED CONCRETE. BASIC PROPERTIES OF THE CONCRETE TEST SPECIMENS USED WERE QUANTITATIVELY EVALUATED: STATIC ULTIMATE TENSILE STRENGTH AND THE CORRESPONDING ULTIMATE TENSILE STRAIN; STATIC INITIAL YOUNG'S MODULUS OF ELASTICITY; STATIC ULTIMATE UNCONFINED COMPRESSIVE STRENGTH, SPECIFIC GRAVITY, MASS DENSITY; SEISMIC VELOCITY; AND DYNAMIC YOUNG'S MODULUS OF ELASTICITY. THE RESULTS REVEALED THAT THE CRITICAL NORMAL FRACTURE STRAIN (CRITICAL VALUE OF TENSILE STRAIN WHICH CAUSES FRACTURE OF THE MATERIAL) OF THE MATERIALS TESTED IS FUNCTIONALLY DEPENDENT ON THE RISE TIMES OF THE STRAINING PULSE. THE RESULTS ALSO SHOWED THAT THE CRITICAL NORMAL FRACTURE STRAIN OF PLAIN CONCRETE CAN BE INCREASED BY THE INCLUSION OF THE RANDOMLY PLACED STEEL WIRE FIBER OF THE TYPE TESTED. /AUTHOR/

• Supplemental Notes:
  • Rept M-1, 220 PP
• Corporate Authors:

  Construction Engineering Research Laboratory

  Army Corps of Engineers, P.O. Box 4005
  Champaign, IL  United States  61820
• Authors:
  • Birkimer, D L
• Publication Date: 1969-10

Subject/Index Terms

• TRT Terms: Breaking loads; Critical values; Density; Dynamic tests; Fibers; Fracture mechanics; Loads; Material reinforcement; Modulus of elasticity; Reinforced concrete; Reinforcing steel; Seismicity; Specific gravity; Static tests; Steel wire; Tensile strength; Tension
• Uncontrolled Terms: Critical loads; Tensile stress; Unconfined compression
• Old TRIS Terms: Seismic properties
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209155
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 4 1970 12:00AM