A SIMPLE TEST OF FRACTURE TOUGHNESS

The authors describe a simple test to determine the fracture toughness of concrete. The stress intensity factor k reaches a critical value kc at the point of instability of crack extension and is taken to be a measure of fracture toughness. Kc and the effective work of fracture zc are recorded for circumferentially notched round bars under four point loading. The results are tabulated and suggest that kc is independent of notch depth for deep notches and of notch width for widths less than 0.056 cm. Kc is also independent of testing speed and is a material constant for concrete, with a low variability for fine-grained mixes. The test is economic of material, suitable for testing in situ concrete and variability of the data is low. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00105317
• Corporate Authors:

  Cement and Concrete Association

  52 Grosvenor Gardens
  London SW1W 0AQ,   England 
• Authors:
  • Barr, B
  • Bear, T
• Publication Date: 1976-4

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 25-27
• Serial:
  • CONCRETE
  • Volume: 10
  • Issue Number: 4
  • Publisher: THE CONCRETE SOCIETY
  • ISSN: 0010-5317

Subject/Index Terms

• TRT Terms: Concrete; Concrete tests; Cracking; Field tests; Fines (Materials); Fracture mechanics; Notch tests; Strength of materials; Stresses; Test procedures; Toughness
• Uncontrolled Terms: Fracture
• Old TRIS Terms: Insitu methods
• ITRD Terms: 4755: Concrete; 5211: Cracking; 9023: Fine (mater); 6226: In situ; 6242: Notch (effect); 5544: Strength (mater); 5575: Stress (in material); 6288: Test method
• Subject Areas: Highways; Materials; Planning and Forecasting; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00138859
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Oct 26 1976 12:00AM