Biaxial Tests of Plain and Fiber Concrete


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Title: Biaxial Tests of Plain and Fiber Concrete

Author(s): W. S. Yin, Eric C. M. Su, M. A. Mansur, and Thomas T. C. Hsu

Publication: Materials Journal

Volume: 86

Issue: 3

Appears on pages(s): 236-243

Keywords: biaxial loads; compressive strength; failure mechanisms; fiber reinforced concrete; plain concrete; strength; strains; stresses; tests; Materials Research

Date: 5/1/1989

Randomly oriented steel fibrous and plain concrete plates of 6 x 6 x 1.5 in. (15.2 x 15.2 x 3.8 cm) were subjected to biaxial compression. The compressive stresses were applied through brush-type loading platens to eliminate frictional stresses between the concrete specimen and the platens. The test program covered four principal compression stress ratios from 0 to 1, steel fibers with 1 in. and 3/4 in. (25 and 19 mm) lengths, and volume percentages of 1.0 and 2.0 percent. Static strengths, deformational characteristics, and fracture mechanism were evaluated. Test results show that fiber concrete possesses higher strength than plain concrete in biaxial compression. The increase is as high as 35 percent in the case of 1 in. fiber length, 2 percent volume ratio, and a stress ratio of å2 / å3 = 0.2. For uniaxial compression, however, the increase of the strength due to the addition of steel fiber was negligible. Observation of failure modes reveals that splitting-type failure occurs in plain concrete, but faulting-type failure is the norm in fiber concrete.