Effect of Curing Regimes and Fiber Contents on Flexural Behaviors of Milling Steel Fiber-Reinforced Ultrahigh-Performance Concrete: Experimental and Data-Driven Studies
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 7
Abstract
The influence of the curing methods on the flexural performances of the milling steel fiber reinforced ultra-high-performance concrete (UHPC) with a high fiber content was systematically evaluated in this study, alongside the flowability and compressive strength. The UHPC specimens were subjected to standard curing and steam curing, employing three steel fiber reinforcing schedules: single milling fiber, single straight fiber, and a combination of both. The flowability of the UHPC was found to be less affected by the milling fiber compared to the straight fiber. Steam curing significantly enhanced the compressive strength but had a slight negative effect on the flexural behavior. However, this adverse effect could be mitigated as the fiber content increased. The flexural strength and toughness of the UHPC with milling fiber were minimally influenced by steam curing, suggesting that standard curing was sufficient for the milling fiber-reinforced UHPC. Conversely, steam curing exhibited an improvement in the flexural behavior of the UHPC containing a hybrid combination of milling and straight fibers. In addition to developing an empirical model for compressive and flexural strengths, we proposed a data-driven model called Gaussian process regression (GPR) to predict the flexural behaviors of the UHPC with varying fiber content, types, and curing methods. The data-driven model demonstrated high accuracy, with an value of 1.0 when compared to the experimental data.
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Data Availability Statement
The data forming the basis of this study is available from the corresponding authors upon reasonable request.
Acknowledgments
This work was financially supported by the Water Resource Science and Technology Innovation Program of Guangdong Province (2017-22), Provincial Undergraduate Training Programs for Innovation and Entrepreneurship of South China University of Technology (No. S202010561255), and Qingyuan Science and Technology Plan Project of Guangdong Province (No. 2020KJJH014).
Author contributions: Wenying Guo: methodology, investigation, supervision, and writing—review and editing. Baixi Chen: methodology, investigation, visualization, formal analysis, writing—original draft, and writing—review and editing. Yibo Yang: methodology, supervision, funding acquisition, and writing—review and editing. Yinggan Xia: methodology, investigation, data curation, and writing—original draft. Qifeng Xiao: methodology and investigation. Shaokun Liu: methodology and funding acquisition. Hengchang Wang: methodology, supervision, and writing—review and editing.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 7 • July 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Aug 2, 2023
Accepted: Dec 12, 2023
Published online: Apr 17, 2024
Published in print: Jul 1, 2024
Discussion open until: Sep 17, 2024
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