Residual Stress and Permeability of Hybrid Fiber-Reinforced High-Strength Concrete Exposed to High Temperature

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Title: Residual Stress and Permeability of Hybrid Fiber-Reinforced High-Strength Concrete Exposed to High Temperature

Author(s): S.L. Suhaendi, T. Horiguchi, and N. Saeki

Publication: Special Publication

Volume: 228

Issue:

Appears on pages(s): 1097-1108

Keywords: explosive spalling; fiber volume fraction; high-strengthconcrete; hybrid fiber; polypropylene fiber; residual property; steel fiber

Date: 6/1/2005

Abstract:
The addition of polypropylene fibers was considered as an effective remedy to mitigate explosive spalling failure mechanism that usually happened to high-strength concrete exposed to high temperature. However, the melting of polypropylene fibers inside the cement matrix tended to greatly reduce the residual properties of the heated concrete. As the possibility of reusing heated concrete will depend on its residual properties, it is of a great interest as to have both good explosive spalling counter effect and better residual properties on the concrete after being subjected to high temperature. On the other hand, steel fiber-reinforced high-strength concrete had shown better residual properties on heated high-strength concrete, even though the explosive spalling counter effect was not as effective as polypropylene fibers. This paper presents the effect of using both polypropylene and steel fibers, called hybrid fibers, on the residual properties of high-strength concrete subjected to high temperature. The residual properties being investigated in this experimental research will include compressive strength, splitting tensile strength, and permeability. Test results showed the effectiveness of hybrid fibers in mitigating the explosive spalling and reducing the properties loss on high-strength concrete subjected to elevated temperature.