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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MDPI AG
2022-12-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/24/9888 |
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| author | Bin Gao Jun Wu Qinyi Chen Jun Yu Haitao Yu |
| author_facet | Bin Gao Jun Wu Qinyi Chen Jun Yu Haitao Yu |
| author_sort | Bin Gao |
| collection | DOAJ |
| 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<sup>1/3</sup> to 0.8 m/kg<sup>1/3</sup>. 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. |
| first_indexed | 2024-03-09T15:52:22Z |
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| id | doaj.art-33d677168ecf4c748326d5b6f2f9af10 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T15:52:22Z |
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| spelling | doaj.art-33d677168ecf4c748326d5b6f2f9af102023-11-24T17:56:58ZengMDPI AGSensors1424-82202022-12-012224988810.3390/s22249888Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete SlabBin Gao0Jun Wu1Qinyi Chen2Jun Yu3Haitao Yu4School of Urban Rail Transportation, Shanghai University of Engineering Science, Shanghai 201620, ChinaSchool of Urban Rail Transportation, Shanghai University of Engineering Science, Shanghai 201620, ChinaSchool of Urban Rail Transportation, Shanghai University of Engineering Science, Shanghai 201620, ChinaSchool of Civil Engineering, Southeast University, Nanjing 211189, ChinaDepartment of Geotechnical Engineering, Tongji University, Shanghai 200092, ChinaRecently, 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<sup>1/3</sup> to 0.8 m/kg<sup>1/3</sup>. 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.https://www.mdpi.com/1424-8220/22/24/9888polyureaUHPC slabsstrengthening effectivenessnear-field explosionparametric analysis |
| spellingShingle | Bin Gao Jun Wu Qinyi Chen Jun Yu Haitao Yu Effect of Spraying Polyurea on the Anti-Blast Performance of the Ultra-High Performance Concrete Slab Sensors polyurea UHPC slabs strengthening effectiveness near-field explosion parametric analysis |
| 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 | polyurea UHPC slabs strengthening effectiveness near-field explosion parametric analysis |
| url | https://www.mdpi.com/1424-8220/22/24/9888 |
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