Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model

This paper presents the results of pull-out tests conducted to investigate the interfacial bond behavior between a carbon-fiber-reinforced polymer (CFRP) grid–polymer cement mortar (PCM) reinforcing layer and existing concrete, and proposes a simplified mechanical model to further study the interfac...

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Autores principales:	Huijuan Dai, Bo Wang, Jiawei Zhang, Junlei Zhang, Kimitaka Uji
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	CFRP grid PCM interface mechanical model pull-out test finite element analysis Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/ce99a61dcc29449286f325e076746ab7
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spelling	oai:doaj.org-article:ce99a61dcc29449286f325e076746ab72021-11-25T18:15:59ZStudy of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model10.3390/ma142270531996-1944https://doaj.org/article/ce99a61dcc29449286f325e076746ab72021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7053https://doaj.org/toc/1996-1944This paper presents the results of pull-out tests conducted to investigate the interfacial bond behavior between a carbon-fiber-reinforced polymer (CFRP) grid–polymer cement mortar (PCM) reinforcing layer and existing concrete, and proposes a simplified mechanical model to further study the interface bond mechanism. Four specimens composed of a CFRP grid, PCM, and concrete were tested. The influence of the type of CFRP grid and the grid interval on the interface bond behavior was discussed. The failure patterns, maximum tensile loads, and CFRP grid strains were obtained. The change process of interface bond stress was investigated based on the grid strain analysis. In addition, the simplified mechanical model and finite element model (FEM) were emphatically established, and the adaptability of the simplified mechanical model was validated through the comparative analysis between the FEM results and the test results. The research results indicate that a CFRP grid with a larger cross-sectional area and smaller grid interval could effectively improve the interface bond behavior. The tensile stress was gradually transferred from the loaded edge to the free edge in the CFRP grid. The interface bond behavior was mainly dependent on the anchorage action of the CFRP grid in the PCM, and the bond action between the PCM and the concrete. The FEM results were consistent with the test results, and the simplified mechanical model with nonlinear springs could well describe the interface bond mechanism between the CFRP grid–PCM reinforcing layer and concrete.Huijuan DaiBo WangJiawei ZhangJunlei ZhangKimitaka UjiMDPI AGarticleCFRP gridPCMinterfacemechanical modelpull-out testfinite element analysisTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7053, p 7053 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	CFRP grid PCM interface mechanical model pull-out test finite element analysis Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	CFRP grid PCM interface mechanical model pull-out test finite element analysis Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Huijuan Dai Bo Wang Jiawei Zhang Junlei Zhang Kimitaka Uji Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model
description	This paper presents the results of pull-out tests conducted to investigate the interfacial bond behavior between a carbon-fiber-reinforced polymer (CFRP) grid–polymer cement mortar (PCM) reinforcing layer and existing concrete, and proposes a simplified mechanical model to further study the interface bond mechanism. Four specimens composed of a CFRP grid, PCM, and concrete were tested. The influence of the type of CFRP grid and the grid interval on the interface bond behavior was discussed. The failure patterns, maximum tensile loads, and CFRP grid strains were obtained. The change process of interface bond stress was investigated based on the grid strain analysis. In addition, the simplified mechanical model and finite element model (FEM) were emphatically established, and the adaptability of the simplified mechanical model was validated through the comparative analysis between the FEM results and the test results. The research results indicate that a CFRP grid with a larger cross-sectional area and smaller grid interval could effectively improve the interface bond behavior. The tensile stress was gradually transferred from the loaded edge to the free edge in the CFRP grid. The interface bond behavior was mainly dependent on the anchorage action of the CFRP grid in the PCM, and the bond action between the PCM and the concrete. The FEM results were consistent with the test results, and the simplified mechanical model with nonlinear springs could well describe the interface bond mechanism between the CFRP grid–PCM reinforcing layer and concrete.
format	article
author	Huijuan Dai Bo Wang Jiawei Zhang Junlei Zhang Kimitaka Uji
author_facet	Huijuan Dai Bo Wang Jiawei Zhang Junlei Zhang Kimitaka Uji
author_sort	Huijuan Dai
title	Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model
title_short	Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model
title_full	Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model
title_fullStr	Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model
title_full_unstemmed	Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model
title_sort	study of the interfacial bond behavior between cfrp grid–pcm reinforcing layer and concrete via a simplified mechanical model
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ce99a61dcc29449286f325e076746ab7
work_keys_str_mv	AT huijuandai studyoftheinterfacialbondbehaviorbetweencfrpgridpcmreinforcinglayerandconcreteviaasimplifiedmechanicalmodel AT bowang studyoftheinterfacialbondbehaviorbetweencfrpgridpcmreinforcinglayerandconcreteviaasimplifiedmechanicalmodel AT jiaweizhang studyoftheinterfacialbondbehaviorbetweencfrpgridpcmreinforcinglayerandconcreteviaasimplifiedmechanicalmodel AT junleizhang studyoftheinterfacialbondbehaviorbetweencfrpgridpcmreinforcinglayerandconcreteviaasimplifiedmechanicalmodel AT kimitakauji studyoftheinterfacialbondbehaviorbetweencfrpgridpcmreinforcinglayerandconcreteviaasimplifiedmechanicalmodel
_version_	1718411406344192000

Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model

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