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Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate

Several reinforced-concrete (RC) structural elements are subjected to cyclic load, such those employed in highway and railroad bridges and viaducts. The durability of these elements may be reduced as a consequence of fatigue, which mainly affects the steel reinforcement. The use of externally bonded...

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Autores principales: Calabrese, Angelo Savio, D’Antino, Tommaso, Colombi, Pierluigi, Carloni, Christian, Poggi, Carlo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7287857/
https://www.ncbi.nlm.nih.gov/pubmed/32455652
http://dx.doi.org/10.3390/ma13102368
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author Calabrese, Angelo Savio
D’Antino, Tommaso
Colombi, Pierluigi
Carloni, Christian
Poggi, Carlo
author_facet Calabrese, Angelo Savio
D’Antino, Tommaso
Colombi, Pierluigi
Carloni, Christian
Poggi, Carlo
author_sort Calabrese, Angelo Savio
collection PubMed
description Several reinforced-concrete (RC) structural elements are subjected to cyclic load, such those employed in highway and railroad bridges and viaducts. The durability of these elements may be reduced as a consequence of fatigue, which mainly affects the steel reinforcement. The use of externally bonded (EB) fiber-reinforced cementitious matrix (FRCM) composites allows the moment capacity to be shared by the internal reinforcement and the EB composite, thus increasing the fatigue life of the strengthened RC member. The effectiveness of EB FRCM composites is related to the composite bond properties. However, limited research is currently available on the effect of fatigue on the bond behavior of FRCM-substrate joints. This study provides first the state of the art on the fatigue behavior of different FRCM composites bonded to a concrete substrate. Then, the fatigue bond behavior of a polyparaphenylene benzo-bisoxazole (PBO) FRCM is experimentally investigated using a modified beam test set-up. The use of this set-up provided information on the effect of fiber-matrix interface shear and normal stresses on the specimen fatigue bond behavior. The results showed that fatigue loading may induce premature debonding at the matrix-fiber interface and that stresses normal to the interface reduce the specimen fatigue life.
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spelling pubmed-72878572020-06-15 Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate Calabrese, Angelo Savio D’Antino, Tommaso Colombi, Pierluigi Carloni, Christian Poggi, Carlo Materials (Basel) Article Several reinforced-concrete (RC) structural elements are subjected to cyclic load, such those employed in highway and railroad bridges and viaducts. The durability of these elements may be reduced as a consequence of fatigue, which mainly affects the steel reinforcement. The use of externally bonded (EB) fiber-reinforced cementitious matrix (FRCM) composites allows the moment capacity to be shared by the internal reinforcement and the EB composite, thus increasing the fatigue life of the strengthened RC member. The effectiveness of EB FRCM composites is related to the composite bond properties. However, limited research is currently available on the effect of fatigue on the bond behavior of FRCM-substrate joints. This study provides first the state of the art on the fatigue behavior of different FRCM composites bonded to a concrete substrate. Then, the fatigue bond behavior of a polyparaphenylene benzo-bisoxazole (PBO) FRCM is experimentally investigated using a modified beam test set-up. The use of this set-up provided information on the effect of fiber-matrix interface shear and normal stresses on the specimen fatigue bond behavior. The results showed that fatigue loading may induce premature debonding at the matrix-fiber interface and that stresses normal to the interface reduce the specimen fatigue life. MDPI 2020-05-21 /pmc/articles/PMC7287857/ /pubmed/32455652 http://dx.doi.org/10.3390/ma13102368 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Calabrese, Angelo Savio
D’Antino, Tommaso
Colombi, Pierluigi
Carloni, Christian
Poggi, Carlo
Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate
title Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate
title_full Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate
title_fullStr Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate
title_full_unstemmed Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate
title_short Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate
title_sort fatigue behavior of pbo frcm composite applied to concrete substrate
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7287857/
https://www.ncbi.nlm.nih.gov/pubmed/32455652
http://dx.doi.org/10.3390/ma13102368
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