Effect of embedment length on pullout behavior of amorphous steel fiber in Portland cement composites

Baek Joong Kim; Chongku Yi

doi:10.1016/j.conbuildmat.2017.03.030

Effect of embedment length on pullout behavior of amorphous steel fiber in Portland cement composites

Baek Joong Kim, Chongku Yi

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

For using amorphous steel fibers (ASF) in Portland cement composites, the performance of ASF was evaluated by a pullout test and compared to that of a hooked-end steel fiber (HSF). The embedment length of the fiber (5.0, 8.0, and 12.5 mm), compressive strength of the mortar, and number of fibers were considered the test variables. The results showed that a single ASF had a greater maximum applied load (P_max) than a single HSF; however, at a mortar compressive strength of 30–42 MPa, its bond strength (τ_max) and pullout energy (E_f) decreased by 40.9–55.8% and 16.9–79.7%, respectively, compared to those of a single HSF. Furthermore, in the pullout failure mode, the E_f of 4 ASFs, which have a volume fraction equivalent to a single HSF, was 2.10–3.04 times higher than that of a single HSF. Based on the E_f of ASFs, an embedment length of 5–8 mm is recommended to provide the most effective ASF reinforcement effect to a mortar with a compressive strength of up to 40 MPa.

Original language	English
Pages (from-to)	83-91
Number of pages	9
Journal	Construction and Building Materials
Volume	143
DOIs	https://doi.org/10.1016/j.conbuildmat.2017.03.030
Publication status	Published - 2017 Jul 15

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2013R1A1A2012788). In addition, in part, this study was supported by a Korea University grant. It is also noted that this study made use of the KBSI SEM facility at Seoul, Korea.

Publisher Copyright:
© 2017 Elsevier Ltd

Keywords

Amorphous steel fiber
Embedment length
Portland cement composite
Pull out behavior

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2017.03.030

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abstract = "For using amorphous steel fibers (ASF) in Portland cement composites, the performance of ASF was evaluated by a pullout test and compared to that of a hooked-end steel fiber (HSF). The embedment length of the fiber (5.0, 8.0, and 12.5 mm), compressive strength of the mortar, and number of fibers were considered the test variables. The results showed that a single ASF had a greater maximum applied load (Pmax) than a single HSF; however, at a mortar compressive strength of 30–42 MPa, its bond strength (τmax) and pullout energy (Ef) decreased by 40.9–55.8% and 16.9–79.7%, respectively, compared to those of a single HSF. Furthermore, in the pullout failure mode, the Ef of 4 ASFs, which have a volume fraction equivalent to a single HSF, was 2.10–3.04 times higher than that of a single HSF. Based on the Ef of ASFs, an embedment length of 5–8 mm is recommended to provide the most effective ASF reinforcement effect to a mortar with a compressive strength of up to 40 MPa.",

keywords = "Amorphous steel fiber, Embedment length, Portland cement composite, Pull out behavior",

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note = "Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2013R1A1A2012788). In addition, in part, this study was supported by a Korea University grant. It is also noted that this study made use of the KBSI SEM facility at Seoul, Korea. Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

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AU - Yi, Chongku

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N2 - For using amorphous steel fibers (ASF) in Portland cement composites, the performance of ASF was evaluated by a pullout test and compared to that of a hooked-end steel fiber (HSF). The embedment length of the fiber (5.0, 8.0, and 12.5 mm), compressive strength of the mortar, and number of fibers were considered the test variables. The results showed that a single ASF had a greater maximum applied load (Pmax) than a single HSF; however, at a mortar compressive strength of 30–42 MPa, its bond strength (τmax) and pullout energy (Ef) decreased by 40.9–55.8% and 16.9–79.7%, respectively, compared to those of a single HSF. Furthermore, in the pullout failure mode, the Ef of 4 ASFs, which have a volume fraction equivalent to a single HSF, was 2.10–3.04 times higher than that of a single HSF. Based on the Ef of ASFs, an embedment length of 5–8 mm is recommended to provide the most effective ASF reinforcement effect to a mortar with a compressive strength of up to 40 MPa.

AB - For using amorphous steel fibers (ASF) in Portland cement composites, the performance of ASF was evaluated by a pullout test and compared to that of a hooked-end steel fiber (HSF). The embedment length of the fiber (5.0, 8.0, and 12.5 mm), compressive strength of the mortar, and number of fibers were considered the test variables. The results showed that a single ASF had a greater maximum applied load (Pmax) than a single HSF; however, at a mortar compressive strength of 30–42 MPa, its bond strength (τmax) and pullout energy (Ef) decreased by 40.9–55.8% and 16.9–79.7%, respectively, compared to those of a single HSF. Furthermore, in the pullout failure mode, the Ef of 4 ASFs, which have a volume fraction equivalent to a single HSF, was 2.10–3.04 times higher than that of a single HSF. Based on the Ef of ASFs, an embedment length of 5–8 mm is recommended to provide the most effective ASF reinforcement effect to a mortar with a compressive strength of up to 40 MPa.

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Effect of embedment length on pullout behavior of amorphous steel fiber in Portland cement composites

Abstract

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Keywords

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