Effects of Steel Fiber and Specimen Geometric Dimensions on the Mechanical Properties of Ultra-High-Performance Concrete

Ultra-high-performance concrete (UHPC) is an advanced concrete with superior mechanical strength, ductility and durability properties. However, the influence of steel fiber on its constitutive laws and the specimen geometric dimension effect on its strength had not been paid enough attention. To inv...

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Bibliographic Details
Published in:Materials 2022-04, Vol.15 (9), p.3027
Main Authors: Fang, Haozhen, Gu, Mingen, Zhang, Shufeng, Jiang, Haibo, Fang, Zhuangcheng, Hu, Jiaxin
Format: Article
Language:English
Subjects:
Cement
Composite materials
Concrete
Fiber volume fraction
Investigations
Mechanical properties
Modulus of elasticity
Reinforced concrete
Steel fibers
Stress-strain relationships
Tensile properties
Tensile strength
Ultra high performance concrete
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Summary:Ultra-high-performance concrete (UHPC) is an advanced concrete with superior mechanical strength, ductility and durability properties. However, the influence of steel fiber on its constitutive laws and the specimen geometric dimension effect on its strength had not been paid enough attention. To investigate the effect of steel fibers on the properties of UHPC, specimens with different fiber volume contents and fiber types were tested. Meanwhile, the mechanical properties of UHPC at different ages from 3 days to 28 days were conducted. Moreover, specimens with various geometric dimensions were also prepared to study the effect of specimen geometric dimensions (dog-bone-shaped, prism and cylinder specimens) on the properties of UHPC. The results indicated that elastic modulus, tensile peak stress and the corresponding strain increased as the fiber volume content and curing age increased. Specimens with hooked-end fibers exhibited better tensile performance than those with straight fibers. Furthermore, different geometric dimensions of specimens significantly influenced the tensile properties of UHPC. Based on the experimental results, conversion factors were suggested for the transformation of strength obtained from specimens with different geometric dimensions to reference specimens. In addition, both compressive and tensile constitutive laws were proposed to generate the stress-strain relationship of UHPC.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15093027