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Keywords = aluminum oxide fiber-reinforced concrete

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24 pages, 8460 KiB  
Article
Influence of Coated Steel Fibers on Mechanical Properties of UHPC Considering Graphene Oxide, Nano-Aluminum Oxide, and Nano-Calcium Carbonate
by Seyed Sina Mousavi, Khatereh Ahmadi, Mehdi Dehestani and Jung Heum Yeon
Fibers 2025, 13(4), 37; https://doi.org/10.3390/fib13040037 - 29 Mar 2025
Cited by 2 | Viewed by 805
Abstract
The addition of high volume fractions of fibers in ultra-high-performance concrete (UHPC) presents specific durability-based challenges due to the high content of interfacial transition zones (ITZ) between the fibers and surrounding mortar, along with the production cost. Hence, this study explored a novel [...] Read more.
The addition of high volume fractions of fibers in ultra-high-performance concrete (UHPC) presents specific durability-based challenges due to the high content of interfacial transition zones (ITZ) between the fibers and surrounding mortar, along with the production cost. Hence, this study explored a novel coating approach on the surface of micro steel fibers, considering various nanomaterials, including graphene oxide (GO), nano-aluminum oxide, and nano-calcium carbonate. Poly(vinyl alcohol) (PVA) was employed as a coupling agent. UHPC mixtures containing coated fibers were compared with reference uncoated fiber-reinforced UHPC and UHPC containing GO. The proficiency of the proposed technique was measured through compressive strength, direct tensile, and flexural tests. A microstructure analysis was conducted using scanning electron microscope (SEM) images to determine the ITZ depth surrounding the coated fibers. Findings indicated improvements ranging from 10.7% to 21% for compressive strength, 11.2% to 38% for tensile strength, and 26.6% to 60% for flexural capacity. Full article
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19 pages, 5916 KiB  
Article
Study on Impact Compression Performance and Constitutive Model of Aluminum Oxide Fiber-Reinforced Concrete
by Ao Yao, Jinyu Xu, Wei Xia, He Huang and Yipeng Ning
Appl. Sci. 2022, 12(10), 4909; https://doi.org/10.3390/app12104909 - 12 May 2022
Cited by 4 | Viewed by 2049
Abstract
In order to explore the impact compression performance of aluminum oxide fiber concrete, the impact compression test of aluminum oxide fiber concrete with different contents is carried out by using the split Hopkinson pressure bar (SHPB) comprehensive test system with a diameter of [...] Read more.
In order to explore the impact compression performance of aluminum oxide fiber concrete, the impact compression test of aluminum oxide fiber concrete with different contents is carried out by using the split Hopkinson pressure bar (SHPB) comprehensive test system with a diameter of 100 mm. Our intent was to explore the influence law of different contents of aluminum oxide fiber on the impact compression performance of concrete matrixes, and to optimize and establish a constitutive model based on damage theory and stress residue. The results show that adding alumina short-cut fiber to concrete changes its mechanical properties of impact compression to a certain extent. When the volume content of fiber is 0.2%, the characteristics of strength, deformation, and energy are the best, and the excess aluminum oxide fiber reduces the original performance due to agglomeration and other factors; the strength characteristics, peak deformation characteristics, and energy characteristics of aluminum oxide fiber concrete are significantly affected by strain rate and impact velocity. Based on the Zhu-Wang-Tang non-linear viscoelastic model (ZWT model), the complexity coefficient is optimized and the residual stress term is added to construct the prediction model of aluminum oxide fiber concrete. The parameters in the model have a good prediction effect on the stress-strain curve under different strain rates. Full article
(This article belongs to the Special Issue Advances in High-Performance Fiber-Reinforced Concrete)
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