International Concrete Abstracts Portal

Title: PULLOUT RESPONSES OF STEEL FIBERS IN FIBER REINFORCED MORTAR MATRICES

Author(s): Manote Sappakittipakorn and Nemkumar Banthia

Publication: TCA

Volume: 1

Issue: 1

Appears on pages(s): 24-30

Keywords: fiber reinforced concrete, single fiber pullout test, steel fiber, cellulose fiber, polypropylene fiber

DOI:

Date: 1/1/2013

Abstract:
In fiber reinforced concrete (FRC), a flexural toughness is enhanced by the inclusion of fibers. The enhancement primarily depends on bond-slip characteristics between fibers and matrices. Recently, the concept of fiber hybridization is recognized as it synergizes the toughness performance. In the case of the hybridization between finer and coarser fibers, the finer fibers alter the properties of the matrices, which may affect the bond-slip response of the coarser fibers. Such influence was studied experimentally through a single fiber pull out test in this study. A series of tests was conducted to test the pullout resistance of two different types of steel fibers (i.e. hooked-end fibers and dead-drag fibers) inserted in four different cement mortar matrices (i.e. plain mortar, cellulose fiber reinforced mortar, 6-mm polypropylene fiber mortar, and 12-mm polypropylene fiber reinforced mortar). Four replicates were investigated in each combination. Results of the test show that the fibers in the matrices improve the bond-slip responses of the dead-drag fiber but only slightly change the bond-slip responses of the hooked-end fiber.