Author(s): Nabeel A. Farhan, M. Neaz Sheikh, and Muhammad N. S. Hadi
The effects of aspect ratio and volume fraction of steel fibers on the engineering properties of ambient-cured geopolymer concrete (GPC) were investigated. Straight macro steel fibers with an aspect ratio of 65 and straight micro steel fibers with an aspect ratio of 30 were added into the GPC mixtures.
The test results showed that the engineering properties of GPC significantly improved with the addition of 2% macro steel fibers and 2% micro steel fibers by volume. The stress-strain behavior of GPC changed from brittle to ductile with significant improvement in the post-peak behavior by the addition of steel fibers.
The compressive strength of GPC increased significantly with the addition of low-aspect-ratio steel fibers and the indirect tensile strength, flexural strength, direct tensile strength, and double punch tensile strength of GPC increased significantly with the addition of high-aspect-ratio steel fibers.
Keywords: ambient curing; engineering properties; geopolymer concrete (GPC); steel fiber