Effect of fiber length and placement method on flexural behavior, tension-softening curve, and fiber distribution characteristics of UHPFRC

Doo Yeol Yoo, Su Tea Kang, Young Soo Yoon

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

This study investigates the effect of fiber length and placement method on the flexural behavior, tension-softening curve, and fiber distribution characteristics of ultra-high-performance fiber-reinforced concrete (UHPFRC). Four different fiber lengths (Lf = 13, 16.3, 19.5, and 30 mm) were considered for two different placement methods. The ultimate flexural strength increased with increasing fiber length up to 19.5 mm, despite no noticeable difference in the first crack strength. Conversely, fiber length of 30 mm showed deterioration of flexural performance due to the decrease of fiber number existed across the crack surface. Both of first crack and ultimate flexural strengths were affected by the placement method; the specimen with concrete placed in the center (at maximum moment region) exhibited higher strength than that with concrete placed in the corner. The reasons were confirmed by image analysis that poorer fiber dispersion and fewer fibers across the crack surface were obtained for the specimen with concrete placed in the center than its counterpart. Finally, a tri-linear softening curve for UHPFRC was suggested based on inverse analysis and verified through comparison between the finite element analyses and the test data.

Original languageEnglish
Pages (from-to)67-81
Number of pages15
JournalConstruction and Building Materials
Volume64
DOIs
Publication statusPublished - 2014 Aug 14

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Reinforced concrete
Fibers
Cracks
Concretes
Bending strength
Image analysis
Deterioration

Keywords

  • Fiber reinforcement
  • Finite element analysis
  • Image analysis
  • Mechanical properties
  • Tension-softening curve

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

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title = "Effect of fiber length and placement method on flexural behavior, tension-softening curve, and fiber distribution characteristics of UHPFRC",
abstract = "This study investigates the effect of fiber length and placement method on the flexural behavior, tension-softening curve, and fiber distribution characteristics of ultra-high-performance fiber-reinforced concrete (UHPFRC). Four different fiber lengths (Lf = 13, 16.3, 19.5, and 30 mm) were considered for two different placement methods. The ultimate flexural strength increased with increasing fiber length up to 19.5 mm, despite no noticeable difference in the first crack strength. Conversely, fiber length of 30 mm showed deterioration of flexural performance due to the decrease of fiber number existed across the crack surface. Both of first crack and ultimate flexural strengths were affected by the placement method; the specimen with concrete placed in the center (at maximum moment region) exhibited higher strength than that with concrete placed in the corner. The reasons were confirmed by image analysis that poorer fiber dispersion and fewer fibers across the crack surface were obtained for the specimen with concrete placed in the center than its counterpart. Finally, a tri-linear softening curve for UHPFRC was suggested based on inverse analysis and verified through comparison between the finite element analyses and the test data.",
keywords = "Fiber reinforcement, Finite element analysis, Image analysis, Mechanical properties, Tension-softening curve",
author = "Yoo, {Doo Yeol} and Kang, {Su Tea} and Yoon, {Young Soo}",
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AU - Yoo, Doo Yeol

AU - Kang, Su Tea

AU - Yoon, Young Soo

PY - 2014/8/14

Y1 - 2014/8/14

N2 - This study investigates the effect of fiber length and placement method on the flexural behavior, tension-softening curve, and fiber distribution characteristics of ultra-high-performance fiber-reinforced concrete (UHPFRC). Four different fiber lengths (Lf = 13, 16.3, 19.5, and 30 mm) were considered for two different placement methods. The ultimate flexural strength increased with increasing fiber length up to 19.5 mm, despite no noticeable difference in the first crack strength. Conversely, fiber length of 30 mm showed deterioration of flexural performance due to the decrease of fiber number existed across the crack surface. Both of first crack and ultimate flexural strengths were affected by the placement method; the specimen with concrete placed in the center (at maximum moment region) exhibited higher strength than that with concrete placed in the corner. The reasons were confirmed by image analysis that poorer fiber dispersion and fewer fibers across the crack surface were obtained for the specimen with concrete placed in the center than its counterpart. Finally, a tri-linear softening curve for UHPFRC was suggested based on inverse analysis and verified through comparison between the finite element analyses and the test data.

AB - This study investigates the effect of fiber length and placement method on the flexural behavior, tension-softening curve, and fiber distribution characteristics of ultra-high-performance fiber-reinforced concrete (UHPFRC). Four different fiber lengths (Lf = 13, 16.3, 19.5, and 30 mm) were considered for two different placement methods. The ultimate flexural strength increased with increasing fiber length up to 19.5 mm, despite no noticeable difference in the first crack strength. Conversely, fiber length of 30 mm showed deterioration of flexural performance due to the decrease of fiber number existed across the crack surface. Both of first crack and ultimate flexural strengths were affected by the placement method; the specimen with concrete placed in the center (at maximum moment region) exhibited higher strength than that with concrete placed in the corner. The reasons were confirmed by image analysis that poorer fiber dispersion and fewer fibers across the crack surface were obtained for the specimen with concrete placed in the center than its counterpart. Finally, a tri-linear softening curve for UHPFRC was suggested based on inverse analysis and verified through comparison between the finite element analyses and the test data.

KW - Fiber reinforcement

KW - Finite element analysis

KW - Image analysis

KW - Mechanical properties

KW - Tension-softening curve

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