CRACKING BEHAVIOR OF STEEL FIBER REINFORCED CONCRETE REVEALED BY MEANS OF ACOUSTIC EMISSION AND ULTRASONIC WAVE PROPAGATION

Results of a study on the cracking behavior of steel fiber reinforced concrete (SFRC) are presented. Third-point bend tests were carried out on notched beams. Test setup enabled recording of load, beam deflection, and crack mouth opening displacement. Simultaneously, acoustic waves caused by cracking were counted. At regular time intervals, ultrasonic compression waves were induced at one beam end and recorded at the other beam end after propagation through the sample. Both methods revealed the cracking behavior of SFRC. A frequency analysis of the acoustic activity found that low-frequency events can be attributed to microcracking, while high-frequency emissions unveiled macroscopic happenings such as macrocracks, load transfer from matrix to fibers, and fiber pullout. The ultrasonic waves can be interpreted from their energy or velocity. The wave energy was affected by microcracking, while the wave velocity exhibited a change when a macrocrack developed over a certain beam depth. The conjunction of both methods helped to determine, in an objective manner, the moment when the first macrocrack appeared.

• Record URL:
  • http://www.concrete.org/Publications/InternationalConcreteAbstractsPortal.aspx.aspx?m=details&i=625
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Van Hauwaert, A
  • Delannay, F
  • Thimus, J-F
• Publication Date: 1999-5

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 291-296
• Serial:
  • ACI Materials Journal
  • Volume: 96
  • Issue Number: 3
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-325X
  • Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

• TRT Terms: Acoustic waves; Acoustics; Bending; Cracking; Experiments; Fiber reinforced concrete; Fracture properties; Reinforced concrete; Reinforcing steel; Steel fibers; Ultrasonic tests; Ultrasonic waves
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00765128
• Record Type: Publication
• Contract Numbers: MSS-9257344
• Files: TRIS
• Created Date: Jun 27 1999 12:00AM