Abstract
This paper investigates the effect of matrix strength (or composition) on the pullout behavior of high strength deformed steel fibers. 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.
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