The Mechanical Properties and Damage Evolution of UHPC Reinforced with Glass Fibers and High-Performance Polypropylene Fibers

Due to the sharp and corrosion-prone features of steel fibers, there is a demand for ultra-high-performance concrete (UHPC) reinforced with nonmetallic fibers. In this paper, glass fiber (GF) and the high-performance polypropylene (HPP) fiber were selected to prepare UHPC, and the effects of differe...

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Bibliographic Details
Published in:Materials 2021-05, Vol.14 (9), p.2455
Main Authors: He, Jiayuan, Chen, Weizhen, Zhang, Boshan, Yu, Jiangjiang, Liu, Hang
Format: Article
Language:English
Subjects:
Carbon fibers
Cement
Compressive strength
Concrete mixing
Corrosion
Crack propagation
Curing
Damage
Evolution
Flexural strength
Fractures
Glass fiber reinforced plastics
Humidity
Mathematical models
Mechanical properties
Modulus of rupture in bending
Numerical models
Particle size
Performance indices
Polyethylene terephthalate
Polypropylene
Polyvinyl alcohol
Quartz
Reinforced concrete
Reinforcing steels
Simulation
Software
Steel fibers
Strain gauges
Strain hardening
Tension tests
Ultra high performance concrete
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Summary:Due to the sharp and corrosion-prone features of steel fibers, there is a demand for ultra-high-performance concrete (UHPC) reinforced with nonmetallic fibers. In this paper, glass fiber (GF) and the high-performance polypropylene (HPP) fiber were selected to prepare UHPC, and the effects of different fibers on the compressive, tensile and bending properties of UHPC were investigated, experimentally and numerically. Then, the damage evolution of UHPC was further studied numerically, adopting the concrete damaged plasticity (CDP) model. The difference between the simulation values and experimental values was within 5.0%, verifying the reliability of the numerical model. The results indicate that 2.0% fiber content in UHPC provides better mechanical properties. In addition, the glass fiber was more significant in strengthening the effect. Compared with HPP-UHPC, the compressive, tensile and flexural strength of GF-UHPC increased by about 20%, 30% and 40%, respectively. However, the flexural toughness indexes I5, I10 and I20 of HPP-UHPC were about 1.2, 2.0 and 3.8 times those of GF-UHPC, respectively, showing that the toughening effect of the HPP fiber is better.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14092455