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 language | English |
|---|---|
| Pages (from-to) | 67-81 |
| Number of pages | 15 |
| Journal | Construction and Building Materials |
| Volume | 64 |
| DOIs | |
| Publication status | Published - 2014 Aug 14 |
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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
Effect of fiber length and placement method on flexural behavior, tension-softening curve, and fiber distribution characteristics of UHPFRC. / Yoo, Doo Yeol; Kang, Su Tea; Yoon, Young Soo.
In: Construction and Building Materials, Vol. 64, 14.08.2014, p. 67-81.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of fiber length and placement method on flexural behavior, tension-softening curve, and fiber distribution characteristics of UHPFRC
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
UR - http://www.scopus.com/inward/record.url?scp=84899569092&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84899569092&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2014.04.007
DO - 10.1016/j.conbuildmat.2014.04.007
M3 - Article
AN - SCOPUS:84899569092
VL - 64
SP - 67
EP - 81
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -