Title:
Concrete Reinforced with Deformed Steel Fibers, Part I: Bond-Slip Mechanisms
Author(s):
Nemkumar Banthia and Jean-Fancois Trottier
Publication:
Materials Journal
Volume:
91
Issue:
5
Appears on pages(s):
435-446
Keywords:
bond-slip; fibers; pullout tests; reinforced concrete; steel fibers; toughness; Materials Research
DOI:
10.14359/4059
Date:
9/1/1994
Abstract:
Bond-slip characteristics were investigated for three deformed steel fibers bonded in concrete matrixes with different strengths. Fibers were aligned at 0, 15, 30, 45, and 60 deg with respect to the loading direction, and complete load-versus-slip curves were obtained. It was found that the bond-slip characteristics of fibers aligned with respect to the loading direction were significantly superior than those for inclined fibers. Inclined fibers supported smaller peak pullout loads and absorbed lesser pullout energies than the aligned fibers. A high-strength matrix often caused brittle modes of fiber and matrix failures and led to reductions in the energy-absorption capability. The paper provides interpretations of the bond-slip curves based on various micromechanical processes in the matrix and the fiber and identifies the conditions that lead to a brittle response. The bond-slip information generated in this study for the various deformed fibers will be correlated to the actual behavior of fiber reinforced concrete in Part II of this paper.