Shear strengthening of reinforced concrete beams using geopolymer-bonded small-diameter FRP bars

Kai-Di Peng; Jun-Qi Huang; Bo-Tao Huang; Ling-Yu Xu; Jian-Guo Dai

doi:10.1016/j.compstruct.2022.116513

Shear strengthening of reinforced concrete beams using geopolymer-bonded small-diameter FRP bars

Kai-Di Peng, Jun-Qi Huang, Bo-Tao Huang^*, Ling-Yu Xu, Jian-Guo Dai^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

40 Citations (Scopus)

Abstract

In this study, a comprehensive investigation of the shear behavior of RC beams strengthened with a small-diameter FRP bar-reinforced geopolymer matrix (FRGM) system is presented for the first time. A total of twelve RC beams, including two reference beams and ten strengthened beams, were prepared and tested. Five factors were considered, including bonding methods (geopolymer-bonded vs. epoxy-bonded), matrix types (slag-to-fly ash ratios of 9:1 vs. 6:4), alignment directions of small-diameter FRP bars (90° vs. 45° to the longitudinal direction), configurations of FRGM layers (single-side vs. double-side), and shear span-to-depth ratios of RC beams (a/d = 2.4 vs. 3.2). The strengthening efficiency of RC beams with the double-side FRGM layer (1.9 times that of the reference beam) was found to be much larger than that of the RC beams with the single-side FRGM layer (1.2 times that of the reference beam). In addition, the geopolymer-bonded layer showed a similar load capacity (approximately 98 %) to its epoxy-bonded counterpart. The use of steel fibers in geopolymer matrix further restrained the development of shear cracks and improved the shear capacity. Finally, a theoretical analysis method was proposed for predicting the shear capacity of the FRGM-strengthened RC beams. © 2022 Elsevier Ltd.

Original language	English
Article number	116513
Journal	Composite Structures
Volume	305
Online published	25 Nov 2022
DOIs	https://doi.org/10.1016/j.compstruct.2022.116513
Publication status	Published - 1 Feb 2023
Externally published	Yes

Funding

This study was supported by Chinese Guangdong Province R&D Plan for Key Areas (Project Code: 2019B111107002) and Hong Kong-Guangzhou Technology and Innovation Partnership Program (Project Code 201807010055). Kai-Di Peng and Ling-Yu Xu acknowledges the Ph.D. studentship offered by The Hong Kong Polytechnic University. Jun-Qi Huang acknowledges the financial support by the National Natural Science Foundation of China (Grant No. 52208158) and the Anhui Provincial Natural Science Foundation (No. 2208085QE172). Bo-Tao Huang acknowledges the support of the Hong Kong Innovation and Technology Fund (Project Code: ITS/077/18FX) through the Research Talent Hub.

Research Keywords

Alkali-activated fly ash/slag
Fiber-Reinforced Polymer (FRP)
Geopolymer
Reinforced concrete
Shear strengthening
Small-diameter FRP bar

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10.1016/j.compstruct.2022.116513

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title = "Shear strengthening of reinforced concrete beams using geopolymer-bonded small-diameter FRP bars",

abstract = "In this study, a comprehensive investigation of the shear behavior of RC beams strengthened with a small-diameter FRP bar-reinforced geopolymer matrix (FRGM) system is presented for the first time. A total of twelve RC beams, including two reference beams and ten strengthened beams, were prepared and tested. Five factors were considered, including bonding methods (geopolymer-bonded vs. epoxy-bonded), matrix types (slag-to-fly ash ratios of 9:1 vs. 6:4), alignment directions of small-diameter FRP bars (90° vs. 45° to the longitudinal direction), configurations of FRGM layers (single-side vs. double-side), and shear span-to-depth ratios of RC beams (a/d = 2.4 vs. 3.2). The strengthening efficiency of RC beams with the double-side FRGM layer (1.9 times that of the reference beam) was found to be much larger than that of the RC beams with the single-side FRGM layer (1.2 times that of the reference beam). In addition, the geopolymer-bonded layer showed a similar load capacity (approximately 98 %) to its epoxy-bonded counterpart. The use of steel fibers in geopolymer matrix further restrained the development of shear cracks and improved the shear capacity. Finally, a theoretical analysis method was proposed for predicting the shear capacity of the FRGM-strengthened RC beams. {\textcopyright} 2022 Elsevier Ltd.",

keywords = "Alkali-activated fly ash/slag, Fiber-Reinforced Polymer (FRP), Geopolymer, Reinforced concrete, Shear strengthening, Small-diameter FRP bar",

author = "Kai-Di Peng and Jun-Qi Huang and Bo-Tao Huang and Ling-Yu Xu and Jian-Guo Dai",

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TY - JOUR

T1 - Shear strengthening of reinforced concrete beams using geopolymer-bonded small-diameter FRP bars

AU - Peng, Kai-Di

AU - Huang, Jun-Qi

AU - Huang, Bo-Tao

AU - Xu, Ling-Yu

AU - Dai, Jian-Guo

PY - 2023/2/1

Y1 - 2023/2/1

N2 - In this study, a comprehensive investigation of the shear behavior of RC beams strengthened with a small-diameter FRP bar-reinforced geopolymer matrix (FRGM) system is presented for the first time. A total of twelve RC beams, including two reference beams and ten strengthened beams, were prepared and tested. Five factors were considered, including bonding methods (geopolymer-bonded vs. epoxy-bonded), matrix types (slag-to-fly ash ratios of 9:1 vs. 6:4), alignment directions of small-diameter FRP bars (90° vs. 45° to the longitudinal direction), configurations of FRGM layers (single-side vs. double-side), and shear span-to-depth ratios of RC beams (a/d = 2.4 vs. 3.2). The strengthening efficiency of RC beams with the double-side FRGM layer (1.9 times that of the reference beam) was found to be much larger than that of the RC beams with the single-side FRGM layer (1.2 times that of the reference beam). In addition, the geopolymer-bonded layer showed a similar load capacity (approximately 98 %) to its epoxy-bonded counterpart. The use of steel fibers in geopolymer matrix further restrained the development of shear cracks and improved the shear capacity. Finally, a theoretical analysis method was proposed for predicting the shear capacity of the FRGM-strengthened RC beams. © 2022 Elsevier Ltd.

AB - In this study, a comprehensive investigation of the shear behavior of RC beams strengthened with a small-diameter FRP bar-reinforced geopolymer matrix (FRGM) system is presented for the first time. A total of twelve RC beams, including two reference beams and ten strengthened beams, were prepared and tested. Five factors were considered, including bonding methods (geopolymer-bonded vs. epoxy-bonded), matrix types (slag-to-fly ash ratios of 9:1 vs. 6:4), alignment directions of small-diameter FRP bars (90° vs. 45° to the longitudinal direction), configurations of FRGM layers (single-side vs. double-side), and shear span-to-depth ratios of RC beams (a/d = 2.4 vs. 3.2). The strengthening efficiency of RC beams with the double-side FRGM layer (1.9 times that of the reference beam) was found to be much larger than that of the RC beams with the single-side FRGM layer (1.2 times that of the reference beam). In addition, the geopolymer-bonded layer showed a similar load capacity (approximately 98 %) to its epoxy-bonded counterpart. The use of steel fibers in geopolymer matrix further restrained the development of shear cracks and improved the shear capacity. Finally, a theoretical analysis method was proposed for predicting the shear capacity of the FRGM-strengthened RC beams. © 2022 Elsevier Ltd.

KW - Alkali-activated fly ash/slag

KW - Fiber-Reinforced Polymer (FRP)

KW - Geopolymer

KW - Reinforced concrete

KW - Shear strengthening

KW - Small-diameter FRP bar

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JO - Composite Structures

JF - Composite Structures

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ER -

Shear strengthening of reinforced concrete beams using geopolymer-bonded small-diameter FRP bars

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