PREVENTION AND CONTROL OF CRACKING BY USE OF SHORT RANDOM FIBERS

THE CORPS OF ENGINEERS AND CARNEGIE INSTITUTE OF TECHNOLOGY HAVE SEPARATELY INVESTIGATED THE RESISTANCE OF FIBROUS REINFORCED CONCRETE TO IMPULSIVE LOADS. THE TESTS BY THE CORPS WERE CENTERED UPON THE RESISTANCE OF RECTANGULAR SLABS TO EXPLOSIVE LOADS ON ONE SIDE. THE FINDINGS ARE: (1) NYLON AND STEEL FIBERS SIGNIFICANTLY REDUCE THE SPALL FRAGMENT VELOCITY OF CONCRETE SLABS AND ARE EFFECTIVE IN RESISTING BOTH TENSILE AND COMPRESSIVE SPALLING OR FRAGMENTING GENERATED BY IMPACT LOADING, (2) FIBROUS REINFORCED CONCRETE POSSESSES GOOD ENERGY-ABSORPTION CHARACTERISTICS, (3) SYNTHETIC FIBERS USED AS RANDOM REINFORCING DO NOT INCREASE THE FLEXURAL CRACKING STRESS OF CONCRETE, HOWEVER, NYLON MONOFILAMENTS WILL INCREASE THE ULTIMATE FLEXURAL STRENGTH AND (4) NO APPRECIABLE INCREASE IN ULTIMATE FLEXURAL STRENGTH IS ACHIEVED UNTIL THE WIRE SPACING IS LESS THAN 0.2 IN. FOR 17 MIL WIRE AND 0.1 IN. FOR 4 MIL WIRE. THE RESULTS OF THESE TESTS SHOW THAT BEAMS MADE WITH FIBER REINFORCED CONCRETE SHOW A SUBSTANTIAL INCREASE IN THE ENERGY ABSORBING ABILITY OF THE BEAM. /AUTHOR/

• Supplemental Notes:
  • Vol 65, No 7, PP 557-558
• Authors:
  • ROMUALDI, J P
  • Ramey, M R
  • Sanday, S C
• Publication Date: 1968-7

Media Info

• Serial:
  • Am Concrete Inst Journal & Proceedings

Subject/Index Terms

• TRT Terms: Concrete; Concrete tests; Control; Cracking; Crash tests; Energy absorption; Fibers; Flexural strength; Loads; Material reinforcement; Nylon; Prevention; Reinforced concrete; Spacing; Spalling; Steel; Stresses; Synthetic fibers; Tensile properties; Wire
• Uncontrolled Terms: Concrete cracking; Fragmentation; Loading
• Subject Areas: Highways; Materials; Research; Security and Emergencies;

Filing Info

• Accession Number: 00213265
• Record Type: Publication
• Files: TRIS
• Created Date: May 26 1994 12:00AM