Cryogenic pullout behavior of steel fibers from ultra-high-performance concrete under impact loading

Min Jae Kim, Doo Yeol Yoo

Research output: Contribution to journalArticle

Abstract

This study investigates the effect of impact loading condition on the pullout property of steel fibers from ultra-high-performance concrete (UHPC) under various temperatures. For this, static and impact loads, ambient and cryogenic (−170 °C) temperatures, three steel fiber types, i.e., straight, half-hooked, and twisted, and two inclination angles of 0° and 45° were considered. From the test results and analysis, it was found that the steel fibers mostly had positive values of dynamic increasing factor (DIF) for the average bond strength at ambient temperature, but these were significantly reduced when the fibers were geometrically deformed, inclined, or tested under cryogenic temperature. Slip capacities generally decreased under the influence of the impact loading condition, and this effect was more severe at cryogenic temperature. There was no obvious impact loading rate effect on the probabilities of fiber and UHPC matrix damages at both ambient and cryogenic temperatures. The DIF values for pullout energies normally decreased or even became negative when the fibers were inclined, geometrically deformed, or tested at cryogenic temperature.

Original languageEnglish
Article number117852
JournalConstruction and Building Materials
Volume239
DOIs
StatePublished - 2020 Apr 10

Fingerprint

High performance concrete
Steel fibers
Cryogenics
Temperature
Fibers

Keywords

  • Cryogenic condition
  • Impact loading
  • Pullout response
  • Steel fiber type
  • Ultra-high-performance concrete

Cite this

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abstract = "This study investigates the effect of impact loading condition on the pullout property of steel fibers from ultra-high-performance concrete (UHPC) under various temperatures. For this, static and impact loads, ambient and cryogenic (−170 °C) temperatures, three steel fiber types, i.e., straight, half-hooked, and twisted, and two inclination angles of 0° and 45° were considered. From the test results and analysis, it was found that the steel fibers mostly had positive values of dynamic increasing factor (DIF) for the average bond strength at ambient temperature, but these were significantly reduced when the fibers were geometrically deformed, inclined, or tested under cryogenic temperature. Slip capacities generally decreased under the influence of the impact loading condition, and this effect was more severe at cryogenic temperature. There was no obvious impact loading rate effect on the probabilities of fiber and UHPC matrix damages at both ambient and cryogenic temperatures. The DIF values for pullout energies normally decreased or even became negative when the fibers were inclined, geometrically deformed, or tested at cryogenic temperature.",
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Cryogenic pullout behavior of steel fibers from ultra-high-performance concrete under impact loading. / Kim, Min Jae; Yoo, Doo Yeol.

In: Construction and Building Materials, Vol. 239, 117852, 10.04.2020.

Research output: Contribution to journalArticle

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