Title: Biaxial Strength and Deformational Behavior of Plain and Steel Fiber Concrete

Author(s): Leonard A. Traina an Shahin A. Mansour

Publication: Materials Journal

Volume: 88

Issue: 4

Appears on pages(s): 353-362

Keywords: biaxial loads; compressive strength; cubes; failure mechanisms; fiber reinforced concretes; metal fibers; plain concretes; strains; stresses; test equipment; Materials Research

DOI: 10.14359/1852

Date: 7/1/1991

Abstract:
Plain and steel fiber reinforced concrete cubes were tested under uniaxial and biaxial stresses. A total of 96 3-in. cubical specimens were used in the testing program. Three principal compression stress ratios, two different steel fibers, and three fiber concentrations were the main variables. Static compressive strengths, stress-strain relationships, volume change, fiber aspect ratio (l/d), fiber volume concentration, failure modes, and crack arrest mechanism were examined. The experimental results showed that steel fiber reinforced concrete had higher, lower, or no changes (depending on fiber type and concentration) in uniaxial compressive strength compared to plain concrete. The highest increase in uniaxial strength was about 22 percent in the case of 1.18 in. fiber length (l/d = 60) at 1.5 percent concentration. For biaxial compression, steel fiber concrete showed higher compressive strength than plain concrete for all cases. The increase was 78 percent in the case of 1.18 in. fiber length (l/d = 60) at 1.5 percent fiber volume concentration at a stress ratio (S = å2 / å1 ) equal to 1. The addition of steel fibers to plain concrete changed the failure mode from the usual tensile splitting-type failure to shear-type failure.