Tensile and bonding behaviours of hybridized BFRP-steel bars as concrete reinforcement

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3 Citations (Scopus)

Abstract

Corrosion of steel increases the cost of maintenance and reduces the long-term performance of steel-reinforced concrete structures. Fibre reinforced polymer (FRP) bars have been developed as promising alternatives. However, the application of FRP bars is limited by high initial cost, low elastic modulus, and brittleness. Therefore, a hybridized basalt FRP and steel (BFRP-steel) rebar is proposed to provide another possible anticorrosive reinforcement for concrete. The proposed rebar protects the steel core with BFRP wrap, and the low cost of steel improves the feasibility of using fibre reinforcement by significantly reducing the total material cost. Four BFRP-steel and seven glass FRP bars were experimentally tested to investigate their tensile strength. Results showed that the hybridized bars allowed a more balanced tensile behaviour, which not only improved the ultimate tensile strength by 47% compared with steel reinforcement, but also overcame the shortage of FRP bar's low elastic modulus by introducing a 169% improvement. Meanwhile, the bond strengths of the FRP bars was tested by pullout tests of four groups of surface treatments. Results indicated that the sand-coating treatment had the highest level of bonding capacity but had a brittle failure mode. A more ductile but less strong bonding behaviour could be achieved by combining the surface treatment of the sand-coating with spiral-wounding. (C) 2018 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)62-71
Number of pages10
JournalConstruction and Building Materials
Volume201
DOIs
Publication statusPublished - 20 Mar 2019

Cite this

@article{3693a4fedb394b96b22f942b096baa1a,
title = "Tensile and bonding behaviours of hybridized BFRP-steel bars as concrete reinforcement",
abstract = "Corrosion of steel increases the cost of maintenance and reduces the long-term performance of steel-reinforced concrete structures. Fibre reinforced polymer (FRP) bars have been developed as promising alternatives. However, the application of FRP bars is limited by high initial cost, low elastic modulus, and brittleness. Therefore, a hybridized basalt FRP and steel (BFRP-steel) rebar is proposed to provide another possible anticorrosive reinforcement for concrete. The proposed rebar protects the steel core with BFRP wrap, and the low cost of steel improves the feasibility of using fibre reinforcement by significantly reducing the total material cost. Four BFRP-steel and seven glass FRP bars were experimentally tested to investigate their tensile strength. Results showed that the hybridized bars allowed a more balanced tensile behaviour, which not only improved the ultimate tensile strength by 47{\%} compared with steel reinforcement, but also overcame the shortage of FRP bar's low elastic modulus by introducing a 169{\%} improvement. Meanwhile, the bond strengths of the FRP bars was tested by pullout tests of four groups of surface treatments. Results indicated that the sand-coating treatment had the highest level of bonding capacity but had a brittle failure mode. A more ductile but less strong bonding behaviour could be achieved by combining the surface treatment of the sand-coating with spiral-wounding. (C) 2018 Elsevier Ltd. All rights reserved.",
keywords = "Basalt fibre, Hybridized BFRP-steel rebar, Tensile strength, Bonding behaviour, FLEXURAL BEHAVIOR, FRP BARS, STRENGTH, COLUMNS",
author = "Guowei Ma and Yimiao Huang and Farhad Aslani and Timothy Kim",
year = "2019",
month = "3",
day = "20",
doi = "10.1016/j.conbuildmat.2018.12.196",
language = "English",
volume = "201",
pages = "62--71",
journal = "Construction and Building Materials",
issn = "0950-0618",
publisher = "Elsevier",

}

TY - JOUR

T1 - Tensile and bonding behaviours of hybridized BFRP-steel bars as concrete reinforcement

AU - Ma, Guowei

AU - Huang, Yimiao

AU - Aslani, Farhad

AU - Kim, Timothy

PY - 2019/3/20

Y1 - 2019/3/20

N2 - Corrosion of steel increases the cost of maintenance and reduces the long-term performance of steel-reinforced concrete structures. Fibre reinforced polymer (FRP) bars have been developed as promising alternatives. However, the application of FRP bars is limited by high initial cost, low elastic modulus, and brittleness. Therefore, a hybridized basalt FRP and steel (BFRP-steel) rebar is proposed to provide another possible anticorrosive reinforcement for concrete. The proposed rebar protects the steel core with BFRP wrap, and the low cost of steel improves the feasibility of using fibre reinforcement by significantly reducing the total material cost. Four BFRP-steel and seven glass FRP bars were experimentally tested to investigate their tensile strength. Results showed that the hybridized bars allowed a more balanced tensile behaviour, which not only improved the ultimate tensile strength by 47% compared with steel reinforcement, but also overcame the shortage of FRP bar's low elastic modulus by introducing a 169% improvement. Meanwhile, the bond strengths of the FRP bars was tested by pullout tests of four groups of surface treatments. Results indicated that the sand-coating treatment had the highest level of bonding capacity but had a brittle failure mode. A more ductile but less strong bonding behaviour could be achieved by combining the surface treatment of the sand-coating with spiral-wounding. (C) 2018 Elsevier Ltd. All rights reserved.

AB - Corrosion of steel increases the cost of maintenance and reduces the long-term performance of steel-reinforced concrete structures. Fibre reinforced polymer (FRP) bars have been developed as promising alternatives. However, the application of FRP bars is limited by high initial cost, low elastic modulus, and brittleness. Therefore, a hybridized basalt FRP and steel (BFRP-steel) rebar is proposed to provide another possible anticorrosive reinforcement for concrete. The proposed rebar protects the steel core with BFRP wrap, and the low cost of steel improves the feasibility of using fibre reinforcement by significantly reducing the total material cost. Four BFRP-steel and seven glass FRP bars were experimentally tested to investigate their tensile strength. Results showed that the hybridized bars allowed a more balanced tensile behaviour, which not only improved the ultimate tensile strength by 47% compared with steel reinforcement, but also overcame the shortage of FRP bar's low elastic modulus by introducing a 169% improvement. Meanwhile, the bond strengths of the FRP bars was tested by pullout tests of four groups of surface treatments. Results indicated that the sand-coating treatment had the highest level of bonding capacity but had a brittle failure mode. A more ductile but less strong bonding behaviour could be achieved by combining the surface treatment of the sand-coating with spiral-wounding. (C) 2018 Elsevier Ltd. All rights reserved.

KW - Basalt fibre

KW - Hybridized BFRP-steel rebar

KW - Tensile strength

KW - Bonding behaviour

KW - FLEXURAL BEHAVIOR

KW - FRP BARS

KW - STRENGTH

KW - COLUMNS

U2 - 10.1016/j.conbuildmat.2018.12.196

DO - 10.1016/j.conbuildmat.2018.12.196

M3 - Article

VL - 201

SP - 62

EP - 71

JO - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

ER -