Motive Characteristics and Adhesion-Rebound Mechanism of Single Aggregate Based on Shotcrete
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 8
Abstract
The theory of viscoelastic collision mechanics is used to explore the rebound and adhesion mechanisms of single aggregates in shotcrete at the meso-level in this study. Abrasive balls with different radiuses were used, fully considering the characteristics of the aggregates and the sprayed wall, to build multifactor physical models for the shotcrete rebound of the aggregate. The movement trajectories, velocities, and energy dissipations of abrasive balls are analyzed, and the shotcrete-rebound mechanical model of a single aggregate based on wet-mix shotcrete is proposed. The results of the study show that there are obvious differences in the rebound velocity of the aggregate in different collision forms, and the viscoelastic properties of aggregates affect the jet stability of wet-mix shotcrete. According to the quantitative and qualitative analyses, the energy loss during the collision-rebound of the aggregate is inversely proportional to the rebound velocity and proportional to the rebound resistance. The functional relationship between the resistance and the particle radius during the rebound and adhesion of aggregate can be expressed as , where is a constant.
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Data Availability Statement
All data included in this study are available upon request by contact with the corresponding author.
Acknowledgments
This study was funded by projects such as National Natural Science Foundation of China (Grant Nos. 51974177, 51934004, 52104199, and 52104206); Natural Science Foundation of Shandong (Grant Nos. ZR2019QEE007 and ZR2019MEE115); Special Funds for Taishan Scholar Project; Major Scientific and Technological Innovation Projects of Shandong Province (Grant No. 2019SDZY0203); Project 43-4; and Open Fund Research Project (Grant No. MDPC2022ZR01).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 8 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 24, 2022
Accepted: Dec 9, 2022
Published online: May 26, 2023
Published in print: Aug 1, 2023
Discussion open until: Oct 26, 2023
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