Influence of materials and nozzle geometry on spray and placement behavior of wet-mix shotcrete
Shotcrete finds extensive applications in civil engineering, from repair and rehabilitation to new constructions. Nevertheless, shotcrete construction frequently suffers from placement issues, such as rebound and overshooting. These challenges can result in reduced operational efficiency, increased...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524000032 |
| _version_ | 1797362652814508032 |
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| author | Xiongxin Wang Md. Mashfiqul Islam Qian Zhang |
| author_facet | Xiongxin Wang Md. Mashfiqul Islam Qian Zhang |
| author_sort | Xiongxin Wang |
| collection | DOAJ |
| description | Shotcrete finds extensive applications in civil engineering, from repair and rehabilitation to new constructions. Nevertheless, shotcrete construction frequently suffers from placement issues, such as rebound and overshooting. These challenges can result in reduced operational efficiency, increased material wastage, diminished construction quality, and potential workplace hazards. It is worth noting that these placement issues are intrinsically linked to the spray characteristics of shotcrete. These characteristics are contingent upon various factors, including the material's flowability and viscosity, as well as the nozzle geometry. This research experimentally characterized the spray behavior of wet-mix shotcrete. High-speed cameras and image analysis techniques were utilized to capture and characterize wet-mix shotcrete on a full-scale spraying setup. The study experimentally determined the key placement performance parameters such as placement, rebound, and final build-up thickness and correlates the placement performance of shotcrete with the spray characteristics. The findings reveal that wider spray opening angles, smaller droplet sizes, and higher velocities contribute to improved material deposition, reduced rebound, and increased build-up thickness. The study also assesses the impact of nozzle geometry and rheology of the shotcrete mixture. Increased flowability led to slightly better spray behavior and placement. Higher material viscosity produced a more consistent spray which enhanced shotcrete performance. Multi-air jet guns, where compressed air directly contacts droplets, can enhance shotcrete spray efficiency. |
| first_indexed | 2024-03-08T16:09:28Z |
| format | Article |
| id | doaj.art-8439838013f843818b850aedd8ab41f9 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-08T16:09:28Z |
| publishDate | 2024-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-8439838013f843818b850aedd8ab41f92024-01-08T04:07:36ZengElsevierCase Studies in Construction Materials2214-50952024-07-0120e02852Influence of materials and nozzle geometry on spray and placement behavior of wet-mix shotcreteXiongxin Wang0Md. Mashfiqul Islam1Qian Zhang2Department of Civil and Environmental Engineering, University of South Florida, Tampa, FL, USADepartment of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL, USADepartment of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL, USA; Correspondence to: 2525 Pottsdamer Street, Suite A129, Tallahassee, FL 32310–6046, USA.Shotcrete finds extensive applications in civil engineering, from repair and rehabilitation to new constructions. Nevertheless, shotcrete construction frequently suffers from placement issues, such as rebound and overshooting. These challenges can result in reduced operational efficiency, increased material wastage, diminished construction quality, and potential workplace hazards. It is worth noting that these placement issues are intrinsically linked to the spray characteristics of shotcrete. These characteristics are contingent upon various factors, including the material's flowability and viscosity, as well as the nozzle geometry. This research experimentally characterized the spray behavior of wet-mix shotcrete. High-speed cameras and image analysis techniques were utilized to capture and characterize wet-mix shotcrete on a full-scale spraying setup. The study experimentally determined the key placement performance parameters such as placement, rebound, and final build-up thickness and correlates the placement performance of shotcrete with the spray characteristics. The findings reveal that wider spray opening angles, smaller droplet sizes, and higher velocities contribute to improved material deposition, reduced rebound, and increased build-up thickness. The study also assesses the impact of nozzle geometry and rheology of the shotcrete mixture. Increased flowability led to slightly better spray behavior and placement. Higher material viscosity produced a more consistent spray which enhanced shotcrete performance. Multi-air jet guns, where compressed air directly contacts droplets, can enhance shotcrete spray efficiency.http://www.sciencedirect.com/science/article/pii/S2214509524000032Wet-mix shotcreteSpray behaviorReboundNozzle designRheology3D printing |
| spellingShingle | Xiongxin Wang Md. Mashfiqul Islam Qian Zhang Influence of materials and nozzle geometry on spray and placement behavior of wet-mix shotcrete Case Studies in Construction Materials Wet-mix shotcrete Spray behavior Rebound Nozzle design Rheology 3D printing |
| title | Influence of materials and nozzle geometry on spray and placement behavior of wet-mix shotcrete |
| title_full | Influence of materials and nozzle geometry on spray and placement behavior of wet-mix shotcrete |
| title_fullStr | Influence of materials and nozzle geometry on spray and placement behavior of wet-mix shotcrete |
| title_full_unstemmed | Influence of materials and nozzle geometry on spray and placement behavior of wet-mix shotcrete |
| title_short | Influence of materials and nozzle geometry on spray and placement behavior of wet-mix shotcrete |
| title_sort | influence of materials and nozzle geometry on spray and placement behavior of wet mix shotcrete |
| topic | Wet-mix shotcrete Spray behavior Rebound Nozzle design Rheology 3D printing |
| url | http://www.sciencedirect.com/science/article/pii/S2214509524000032 |
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