Effect of Matrix Strength on Pullout Behavior of High-Strength Deformed Steel Fibers

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Title: Effect of Matrix Strength on Pullout Behavior of High-Strength Deformed Steel Fibers

Author(s): D. Joo Kim, S. El-Tawil, and A.E. Naaman

Publication: Special Publication

Volume: 272

Issue:

Appears on pages(s): 135-150

Keywords: equivalent bond strength, fiber pullout, matrix strength, pullout energy, and slip hardening.

Date: 10/1/2010

Abstract:
The effect of matrix strength (or composition) on the pullout behavior of high strength deformed steel fibers is investigated. High-strength steel hooked (H-) and twisted (T-) fiber are used in three different matrices with three different compositions generating a low (4.1 ksi [28 MPa]), medium (8.1 ksi [56 MPa]) and high (12.2 ksi [84 MPa]) compressive strength. Although both fibers produce a higher pullout load with a higher compressive strength matrix, T- fiber shows a more sensitive behavior to the matrix strength or composition than H- fiber. Moreover, T- fiber leads to significant enhancements in both pullout load and pullout energy in higher strength matrix than in lower strength matrix. It is observed that T- fiber is generally more efficient in a higher-strength matrix than in a lower-strength matrix.