Study on Dynamic Impact Mechanical Properties of UHPC with High-Content and Directional Reinforced Steel Fiber

Ultra-high-performance concrete (UHPC) is a kind of building material with ultra-high strength, toughness, and durability. However, under the conditions of ordinary molding technology, most of the fibers cannot play a bridging role in the direction of force. In this study, UHPC specimens with differ...

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Bibliographic Details
Published in:Applied sciences 2023-03, Vol.13 (6), p.3753
Main Authors: Sun, Kewei, Wu, Ye, Li, Senlin, Feng, Yan, Feng, Longhai
Format: Article
Language:English
Subjects:
Absorption
Cement
Compression
Compressive properties
Compressive strength
Concrete
Concrete mixing
Curing
directional fiber
Durability
dynamic impact
Energy absorption
Energy consumption
High rise buildings
Impact resistance
Impact tests
Interfacial bonding
Mechanical properties
Reinforced concrete
SHPB
Split Hopkinson pressure bars
Steel
Strain
Stress-strain curves
Technology
UHPC
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Summary:Ultra-high-performance concrete (UHPC) is a kind of building material with ultra-high strength, toughness, and durability. However, under the conditions of ordinary molding technology, most of the fibers cannot play a bridging role in the direction of force. In this study, UHPC specimens with different steel fiber contents (0%, 2%, 4%, and 6% by volume) and directional reinforced fiber were prepared. Based on the split-Hopkinson pressure bar (SHPB), the influence of directional distributed steel fiber on the dynamic impact mechanical properties of the UHPC specimen were systematically investigated. The stress–strain curves, stress peaks, dynamic increase factor (DIF), and ductile energy absorption properties of the specimens at different strain rates were obtained. The results showed that oriented steel fiber significantly increases the dynamic property of UHPC. The dynamic impact peak strain, peak stress, and DIF of the UHPC specimen with 2% oriented steel fiber were 35.78%, 8.8%, and 12.6% higher than that prepared by normal molding technology, respectively. Moreover, with the increase of fiber content, the peak stress, energy absorption, and multiple-impact compression resistance of the specimen were greatly improved. When the fiber content was 6%, the dynamic impact peak strain, dynamic impact compressive strength ratio, and energy absorption capacity of the specimen were 3.09, 1.45, and 4.1 times the reference group, respectively.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13063753