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Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab

Recently, polyurea has been applied to improve the anti-blast performance of metal plates, masonry walls, and concrete structures. However, the strengthening effectiveness of polyurea on ultra-high performance concrete (UHPC) slabs with an overall response is still unclear. Hence, this paper examine...

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Detalles Bibliográficos
Autores principales: Gao, Bin, Wu, Jun, Chen, Qinyi, Yu, Jun, Yu, Haitao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9784008/
https://www.ncbi.nlm.nih.gov/pubmed/36560255
http://dx.doi.org/10.3390/s22249888
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author Gao, Bin
Wu, Jun
Chen, Qinyi
Yu, Jun
Yu, Haitao
author_facet Gao, Bin
Wu, Jun
Chen, Qinyi
Yu, Jun
Yu, Haitao
author_sort Gao, Bin
collection PubMed
description Recently, polyurea has been applied to improve the anti-blast performance of metal plates, masonry walls, and concrete structures. However, the strengthening effectiveness of polyurea on ultra-high performance concrete (UHPC) slabs with an overall response is still unclear. Hence, this paper examined the strengthening effectiveness of polyurea on the anti-blast performance of UHPC slabs under near-field explosion by the finite element (FE) method. First, a benchmark finite element model for UHPC and polyurea-UHPC (PUHPC) slabs under blast loading was established and validated by field blast tests, with scaled distances ranging from 0.4 m/kg(1/3) to 0.8 m/kg(1/3). After that, parametric analysis was conducted to fully understand the strengthening effectiveness of polyurea on the anti-blast performance of the UHPC slab. Factors including the scaled distance, polyurea thickness, span-to-depth ratio of the slab, and longitudinal reinforcement ratio were considered. The results showed that (1) spraying polyurea on the rear face of the UHPC slab can reduce the width of cracks and mitigate the damage of specimens; (2) the strengthening effectiveness of polyurea on the UHPC slab became prominent when the UHPC slab suffered a larger maximum deflection; (3) in terms of the deflection and energy absorption capacity of PUHPC slabs, the optimum thickness of sprayed polyurea was determined to be 8 mm to 12 mm; and (4) by adopting the multiple nonlinear regression method, a prediction formula was developed to quickly obtain the end rotation of the UHPC slab strengthened with polyurea under near-field explosions.
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spelling pubmed-97840082022-12-24 Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab Gao, Bin Wu, Jun Chen, Qinyi Yu, Jun Yu, Haitao Sensors (Basel) Article Recently, polyurea has been applied to improve the anti-blast performance of metal plates, masonry walls, and concrete structures. However, the strengthening effectiveness of polyurea on ultra-high performance concrete (UHPC) slabs with an overall response is still unclear. Hence, this paper examined the strengthening effectiveness of polyurea on the anti-blast performance of UHPC slabs under near-field explosion by the finite element (FE) method. First, a benchmark finite element model for UHPC and polyurea-UHPC (PUHPC) slabs under blast loading was established and validated by field blast tests, with scaled distances ranging from 0.4 m/kg(1/3) to 0.8 m/kg(1/3). After that, parametric analysis was conducted to fully understand the strengthening effectiveness of polyurea on the anti-blast performance of the UHPC slab. Factors including the scaled distance, polyurea thickness, span-to-depth ratio of the slab, and longitudinal reinforcement ratio were considered. The results showed that (1) spraying polyurea on the rear face of the UHPC slab can reduce the width of cracks and mitigate the damage of specimens; (2) the strengthening effectiveness of polyurea on the UHPC slab became prominent when the UHPC slab suffered a larger maximum deflection; (3) in terms of the deflection and energy absorption capacity of PUHPC slabs, the optimum thickness of sprayed polyurea was determined to be 8 mm to 12 mm; and (4) by adopting the multiple nonlinear regression method, a prediction formula was developed to quickly obtain the end rotation of the UHPC slab strengthened with polyurea under near-field explosions. MDPI 2022-12-15 /pmc/articles/PMC9784008/ /pubmed/36560255 http://dx.doi.org/10.3390/s22249888 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
Gao, Bin
Wu, Jun
Chen, Qinyi
Yu, Jun
Yu, Haitao
Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab
title Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab
title_full Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab
title_fullStr Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab
title_full_unstemmed Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab
title_short Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab
title_sort effect of spraying polyurea on the anti-blast performance of the ultra-high performance concrete slab
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9784008/
https://www.ncbi.nlm.nih.gov/pubmed/36560255
http://dx.doi.org/10.3390/s22249888
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