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 signifcantly superior to those for inclined fibers. Inclined fibers supported smaller peak pullout loads and absorbed less pullout energy than the aligned fibers. A high-strength matrix often caused brittle 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 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 the second part of this paper.
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