EXPERIMENTAL STUDY ON CRACK BRIDGING IN FRC UNDER UNIAXIAL FATIGUE TENSION

This paper presents an experimental study on crack bridging in steel-fiber-reinforced concrete (SFRC) materials under deformation-controlled uniaxial fatigue tension. Two types of commercially available steel fibers--straight steel fiber and hooked end steel fiber--were used separately in this experiment. A total of six series of fatigue tensile tests with constant amplitude between maximum and minimum crack openings were conducted. The results show that the bridging stress decreases with the number of load cycles, and this phenomenon is termed bridging degradation. The general behavior of the bridging degradation with the number of cycles in SFRCs is represented by a fast dropping stage (reduction in bridging stress within the first 10-15 cycles) with a decelerated degradation rate, followed by a stable stage with an almost constant degradation rate for straight SFRC, or by several periods with a decelerated rate in each period for hooked SFRC. Although fiber deformation, such as in hooked end fiber, can improve the monotonic crack bridging significantly, faster bridging degradation is found in hooked SFRC than in straight SFRC with the same maximum crack width (>0.1 mm) and minimum load condition.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
• Supplemental Notes:
  • This work was supported by a grant from the Danish Ministry of Education to the Technical University of Denmark (DTU) and a NATO grant that supports collaborative research between the Department of Structural Engineering and Materials, DTU, and the Advanced Civil Engineering Materials Research Laboratory, University of Michigan. Support from the National Science Foundation (CMS-9872357) to the University of Michigan is acknowledged.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Zhang, Jianping
  • Stang, H
  • Li, V C
• Publication Date: 2000-2

Language

• English

Media Info

• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: p. 66-73
• Serial:
  • Journal of Materials in Civil Engineering
  • Volume: 12
  • Issue Number: 1
  • Publisher: American Society of Civil Engineers
  • ISSN: 0899-1561
  • EISSN: 1943-5533
  • Serial URL: http://ascelibrary.org/journal/jmcee7

Subject/Index Terms

• TRT Terms: Cracking; Deformation; Fatigue (Mechanics); Fiber reinforced concrete; Pull out test; Repeated loads; Steel fibers; Tensile strength; Tension; Uniaxial stress
• Uncontrolled Terms: Bridging stress
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00783832
• Record Type: Publication
• Contract Numbers: CMS-9705808, CMS-95-32082, CMS-94-57305
• Files: TRIS
• Created Date: Feb 26 2000 12:00AM