Inorganic adhesive based near-surface-mounted fibre reinforced polymer for strengthening of concrete structures: An overview

Jin Guang Yu; Liang Cheng; Shu Liu; Bing Fu; Bo Li

doi:10.1016/j.istruc.2021.04.017

Inorganic adhesive based near-surface-mounted fibre reinforced polymer for strengthening of concrete structures: An overview

Jin Guang Yu, Liang Cheng, Shu Liu, Bing Fu, Bo Li

Research output: Journal Publication › Review article › peer-review

12 Citations (Scopus)

Abstract

Organic adhesives (e.g. epoxy resin) have been widely used in the near-surface-mounted (NSM) fibre reinforced polymer (FRP) strengthening system for reinforced concrete (RC) structures. However, the drawbacks of the organic adhesives in terms of high-temperature resistance and compatibility with concrete urge the development of inorganic adhesives (e.g. cement-based and alkali-activated materials). Moreover, a premature debonding of NSM FRPs from concrete substrate adversely affects the performance of strengthened RC structures, as well as the efficiency of NSM FRPs. Various anchorage strategies have been consequently proposed to improve the bond between the NSM FRPs and the concrete. This paper presents an overview on the bond behaviour between inorganic adhesive based NSM FRPs and concrete. Flexural strengthening of RC beams with inorganic adhesive based NSM FRPs, and the anchorage strategies for NSM FRPs are also summarized. Different from epoxy-based adhesives, the bond strength of inorganic adhesive based NSM FRPs decreases as the groove dimension increases. The RC beams strengthened by inorganic adhesive based NSM FRPs tend to fail due to an intermediate crack debonding of FRPs, which is probably caused by the low deformation capacity of inorganic adhesives. Anchorage strategies, such as adding external wrapping FRP fabrics or internal additional ribs, could significantly enhance the strengthening efficiency and the constructability of NSM FRPs. In the end, recommendations for future studies on the use of inorganic adhesive based NSM FRPs for structural strengthening are outlined.

Original language	English
Pages (from-to)	2099-2120
Number of pages	22
Journal	Structures
Volume	33
DOIs	https://doi.org/10.1016/j.istruc.2021.04.017
Publication status	Published - Oct 2021

Keywords

Anchorage strategy
Bonding behaviour
Flexural behaviour
Inorganic adhesive
NSM FRPs
RC beams

ASJC Scopus subject areas

Civil and Structural Engineering
Architecture
Building and Construction
Safety, Risk, Reliability and Quality

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10.1016/j.istruc.2021.04.017

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@article{ea6ba533ed354f66a77c13a56afec765,

title = "Inorganic adhesive based near-surface-mounted fibre reinforced polymer for strengthening of concrete structures: An overview",

abstract = "Organic adhesives (e.g. epoxy resin) have been widely used in the near-surface-mounted (NSM) fibre reinforced polymer (FRP) strengthening system for reinforced concrete (RC) structures. However, the drawbacks of the organic adhesives in terms of high-temperature resistance and compatibility with concrete urge the development of inorganic adhesives (e.g. cement-based and alkali-activated materials). Moreover, a premature debonding of NSM FRPs from concrete substrate adversely affects the performance of strengthened RC structures, as well as the efficiency of NSM FRPs. Various anchorage strategies have been consequently proposed to improve the bond between the NSM FRPs and the concrete. This paper presents an overview on the bond behaviour between inorganic adhesive based NSM FRPs and concrete. Flexural strengthening of RC beams with inorganic adhesive based NSM FRPs, and the anchorage strategies for NSM FRPs are also summarized. Different from epoxy-based adhesives, the bond strength of inorganic adhesive based NSM FRPs decreases as the groove dimension increases. The RC beams strengthened by inorganic adhesive based NSM FRPs tend to fail due to an intermediate crack debonding of FRPs, which is probably caused by the low deformation capacity of inorganic adhesives. Anchorage strategies, such as adding external wrapping FRP fabrics or internal additional ribs, could significantly enhance the strengthening efficiency and the constructability of NSM FRPs. In the end, recommendations for future studies on the use of inorganic adhesive based NSM FRPs for structural strengthening are outlined.",

keywords = "Anchorage strategy, Bonding behaviour, Flexural behaviour, Inorganic adhesive, NSM FRPs, RC beams",

author = "Yu, {Jin Guang} and Liang Cheng and Shu Liu and Bing Fu and Bo Li",

note = "Funding Information: The authors wish to acknowledge the financial support from the Zhejiang Provincial Natural Science Foundation of China (No.: LGF19E080008) and Ningbo Municipal Bureau of Science and Technology (No.: 2019B10048). The Zhejiang Provincial Department of Science and Technology is also acknowledged for this research under its Provincial Key Laboratory Programme (No.: 2020E10018). Technical support from Xi'an University of Architecture and Technology and the University of Nottingham Ningbo China are greatly appreciated. Funding Information: The authors wish to acknowledge the financial support from the Zhejiang Provincial Natural Science Foundation of China (No.: LGF19E080008) and Ningbo Municipal Bureau of Science and Technology (No.: 2019B10048). The Zhejiang Provincial Department of Science and Technology is also acknowledged for this research under its Provincial Key Laboratory Programme (No.: 2020E10018). Technical support from Xi{\textquoteright}an University of Architecture and Technology and the University of Nottingham Ningbo China are greatly appreciated. Publisher Copyright: {\textcopyright} 2021 Institution of Structural Engineers",

year = "2021",

month = oct,

doi = "10.1016/j.istruc.2021.04.017",

language = "English",

volume = "33",

pages = "2099--2120",

journal = "Structures",

issn = "2352-0124",

publisher = "Elsevier Ltd.",

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TY - JOUR

T1 - Inorganic adhesive based near-surface-mounted fibre reinforced polymer for strengthening of concrete structures

T2 - An overview

AU - Yu, Jin Guang

AU - Cheng, Liang

AU - Liu, Shu

AU - Fu, Bing

AU - Li, Bo

N1 - Funding Information: The authors wish to acknowledge the financial support from the Zhejiang Provincial Natural Science Foundation of China (No.: LGF19E080008) and Ningbo Municipal Bureau of Science and Technology (No.: 2019B10048). The Zhejiang Provincial Department of Science and Technology is also acknowledged for this research under its Provincial Key Laboratory Programme (No.: 2020E10018). Technical support from Xi'an University of Architecture and Technology and the University of Nottingham Ningbo China are greatly appreciated. Funding Information: The authors wish to acknowledge the financial support from the Zhejiang Provincial Natural Science Foundation of China (No.: LGF19E080008) and Ningbo Municipal Bureau of Science and Technology (No.: 2019B10048). The Zhejiang Provincial Department of Science and Technology is also acknowledged for this research under its Provincial Key Laboratory Programme (No.: 2020E10018). Technical support from Xi’an University of Architecture and Technology and the University of Nottingham Ningbo China are greatly appreciated. Publisher Copyright: © 2021 Institution of Structural Engineers

PY - 2021/10

Y1 - 2021/10

N2 - Organic adhesives (e.g. epoxy resin) have been widely used in the near-surface-mounted (NSM) fibre reinforced polymer (FRP) strengthening system for reinforced concrete (RC) structures. However, the drawbacks of the organic adhesives in terms of high-temperature resistance and compatibility with concrete urge the development of inorganic adhesives (e.g. cement-based and alkali-activated materials). Moreover, a premature debonding of NSM FRPs from concrete substrate adversely affects the performance of strengthened RC structures, as well as the efficiency of NSM FRPs. Various anchorage strategies have been consequently proposed to improve the bond between the NSM FRPs and the concrete. This paper presents an overview on the bond behaviour between inorganic adhesive based NSM FRPs and concrete. Flexural strengthening of RC beams with inorganic adhesive based NSM FRPs, and the anchorage strategies for NSM FRPs are also summarized. Different from epoxy-based adhesives, the bond strength of inorganic adhesive based NSM FRPs decreases as the groove dimension increases. The RC beams strengthened by inorganic adhesive based NSM FRPs tend to fail due to an intermediate crack debonding of FRPs, which is probably caused by the low deformation capacity of inorganic adhesives. Anchorage strategies, such as adding external wrapping FRP fabrics or internal additional ribs, could significantly enhance the strengthening efficiency and the constructability of NSM FRPs. In the end, recommendations for future studies on the use of inorganic adhesive based NSM FRPs for structural strengthening are outlined.

AB - Organic adhesives (e.g. epoxy resin) have been widely used in the near-surface-mounted (NSM) fibre reinforced polymer (FRP) strengthening system for reinforced concrete (RC) structures. However, the drawbacks of the organic adhesives in terms of high-temperature resistance and compatibility with concrete urge the development of inorganic adhesives (e.g. cement-based and alkali-activated materials). Moreover, a premature debonding of NSM FRPs from concrete substrate adversely affects the performance of strengthened RC structures, as well as the efficiency of NSM FRPs. Various anchorage strategies have been consequently proposed to improve the bond between the NSM FRPs and the concrete. This paper presents an overview on the bond behaviour between inorganic adhesive based NSM FRPs and concrete. Flexural strengthening of RC beams with inorganic adhesive based NSM FRPs, and the anchorage strategies for NSM FRPs are also summarized. Different from epoxy-based adhesives, the bond strength of inorganic adhesive based NSM FRPs decreases as the groove dimension increases. The RC beams strengthened by inorganic adhesive based NSM FRPs tend to fail due to an intermediate crack debonding of FRPs, which is probably caused by the low deformation capacity of inorganic adhesives. Anchorage strategies, such as adding external wrapping FRP fabrics or internal additional ribs, could significantly enhance the strengthening efficiency and the constructability of NSM FRPs. In the end, recommendations for future studies on the use of inorganic adhesive based NSM FRPs for structural strengthening are outlined.

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KW - Bonding behaviour

KW - Flexural behaviour

KW - Inorganic adhesive

KW - NSM FRPs

KW - RC beams

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U2 - 10.1016/j.istruc.2021.04.017

DO - 10.1016/j.istruc.2021.04.017

M3 - Review article

AN - SCOPUS:85107575979

SN - 2352-0124

VL - 33

SP - 2099

EP - 2120

JO - Structures

JF - Structures

ER -

Inorganic adhesive based near-surface-mounted fibre reinforced polymer for strengthening of concrete structures: An overview

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Keywords

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