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Bond Behavior of Steel Cords Embedded in Inorganic Mortars

This paper investigates the bond behavior of steel cords embedded in inorganic matrices. A series of pull-out tests were carried out on individual galvanized steel cords embedded in either a cementitious or lime-based mortar matrix and the corresponding bond-slip relationships were derived. The qual...

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Autores principales: Roscini, Francesca, Guadagnini, Maurizio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9330600/
https://www.ncbi.nlm.nih.gov/pubmed/35897557
http://dx.doi.org/10.3390/ma15155125
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author Roscini, Francesca
Guadagnini, Maurizio
author_facet Roscini, Francesca
Guadagnini, Maurizio
author_sort Roscini, Francesca
collection PubMed
description This paper investigates the bond behavior of steel cords embedded in inorganic matrices. A series of pull-out tests were carried out on individual galvanized steel cords embedded in either a cementitious or lime-based mortar matrix and the corresponding bond-slip relationships were derived. The quality of bond between cord and mortar was found to be critically affected by the workability of the mortar and its ability to create adequate composite action along the entire embedment length of the cord. The more workable lime-based mortar was found to guarantee a better interaction with the steel cord, in terms of initial bond stiffness, maximum bond strength, and post-peak behavior. The experimentally derived bond–slip relationships were subsequently integrated in a 3D non-linear finite element framework and used to determine the constitutive relationship of a surface-based cohesive contact between cord and mortar. The cohesive bond behavior was used to conduct a series of parametric studies on cords embedded in a lime-based mortar and examine the stress development within specimens with cords of different embedment lengths and subjected to different loading conditions (i.e., pull-out and direct tension). The active ‘Stress Transfer Zone’ was found to be about 125 mm, while an ‘Effective Transfer Radius’ of approximately 3.5–4 mm was identified. The numerical investigation implemented in this paper enabled one to study key interaction properties of steel reinforced grouts and can assist the design of more effective strengthening solutions.
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spelling pubmed-93306002022-07-29 Bond Behavior of Steel Cords Embedded in Inorganic Mortars Roscini, Francesca Guadagnini, Maurizio Materials (Basel) Article This paper investigates the bond behavior of steel cords embedded in inorganic matrices. A series of pull-out tests were carried out on individual galvanized steel cords embedded in either a cementitious or lime-based mortar matrix and the corresponding bond-slip relationships were derived. The quality of bond between cord and mortar was found to be critically affected by the workability of the mortar and its ability to create adequate composite action along the entire embedment length of the cord. The more workable lime-based mortar was found to guarantee a better interaction with the steel cord, in terms of initial bond stiffness, maximum bond strength, and post-peak behavior. The experimentally derived bond–slip relationships were subsequently integrated in a 3D non-linear finite element framework and used to determine the constitutive relationship of a surface-based cohesive contact between cord and mortar. The cohesive bond behavior was used to conduct a series of parametric studies on cords embedded in a lime-based mortar and examine the stress development within specimens with cords of different embedment lengths and subjected to different loading conditions (i.e., pull-out and direct tension). The active ‘Stress Transfer Zone’ was found to be about 125 mm, while an ‘Effective Transfer Radius’ of approximately 3.5–4 mm was identified. The numerical investigation implemented in this paper enabled one to study key interaction properties of steel reinforced grouts and can assist the design of more effective strengthening solutions. MDPI 2022-07-23 /pmc/articles/PMC9330600/ /pubmed/35897557 http://dx.doi.org/10.3390/ma15155125 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Roscini, Francesca
Guadagnini, Maurizio
Bond Behavior of Steel Cords Embedded in Inorganic Mortars
title Bond Behavior of Steel Cords Embedded in Inorganic Mortars
title_full Bond Behavior of Steel Cords Embedded in Inorganic Mortars
title_fullStr Bond Behavior of Steel Cords Embedded in Inorganic Mortars
title_full_unstemmed Bond Behavior of Steel Cords Embedded in Inorganic Mortars
title_short Bond Behavior of Steel Cords Embedded in Inorganic Mortars
title_sort bond behavior of steel cords embedded in inorganic mortars
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9330600/
https://www.ncbi.nlm.nih.gov/pubmed/35897557
http://dx.doi.org/10.3390/ma15155125
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