Bending Toughness and Calculation Model of Ultrahigh-Performance Concrete with Hybrid Micro- and Nanofillers
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 8
Abstract
Superfine stainless wires (SSWs) and carbon nanotubes (NTs) were used as hybrid micro- and nanofillers to toughen reactive powder concrete (RPC) in this paper. The multiscale synergistic toughening mechanisms of micro- and nanofillers were revealed through theoretical calculation. Experimental results show that incorporating 1.2% by volume SSWs and 1.5% by weight NTs enables the three-point bending strength, first-cracking strength, and bending toughness of RPC to increase by 171.6%, 96.0%, and 572.1%, respectively. The numbers of SSWs being pulled-off at failure are increased by 19.1%, resulting from the addition of nanofillers reducing original flaws and enhancing the interface of SSWs through a nanocore effect at the nanoscale. Meanwhile, the widely distributed core-shell elements and SSWs work together to effectively inhibit the initiation and propagation of cracks by pinning and bridging effect at the microscale, leading to the bending strain-stress curves of RPC with hybrid fillers to have significant strain-hardening and slow strain-softening stages.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors thank the funding supported from the National Science Foundation of China (51908103 and 51978127), and the China Postdoctoral Science Foundation (2019M651116).
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Journal of Materials in Civil Engineering
Volume 33 • Issue 8 • August 2021
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© 2021 American Society of Civil Engineers.
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Received: Jul 29, 2020
Accepted: Dec 29, 2020
Published online: Jun 3, 2021
Published in print: Aug 1, 2021
Discussion open until: Nov 3, 2021
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