Microstructure of ultra-high-performance concrete (UHPC) – A review study

Bahmani, Hadi; Mostofinejad, Davood

doi:10.1016/j.jobe.2022.104118

Cited by 73 publications

(23 citation statements)

References 90 publications

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“…It is clear that the calcium carbonate (CaCO 3 ) peaks of all the HPFRCs tested are at 29.45 • . These observations are attributed to the calcareous nature of the fractions of gravel (3/8) and (8/16) used [96,97].…”

Section: Microstructure Of Hpfrcsmentioning

confidence: 99%

Physicomechanical Behavior of High-Performance Concrete Reinforced with Recycled Steel Fibers from Twisted Cables in the Brittle State—Experimentation and Statistics

Chetbani,

Zaitri,

Tayeh

et al. 2023

Buildings

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This research studied the effect of recycled steel fibers extracted from twisted cable waste on the fresh and hardened states of high-performance concretes. Accordingly, slump, water absorption (WA), compressive strength (CS), flexural strength (FS), and split tensile strength (STS) were measured in the laboratory using mixtures generated by the response surface methodology (RSM). The RSM-based central composite design (CCD) was used to assess the influence of water-to-binder (W/B) ratios from 0.27 to 0.31, length-to-diameter (L/d = 46 to 80) and steel fiber content (SFC) in the range of 19 to 29 kg/m3 on the behavior of high-performance fiber-reinforced concrete (HPFRC). The accuracy and validation of the generated models were evaluated by employing analysis of variance (ANOVA) and optimal parameters. The experimental findings revealed that the use of an L/d ratio of 63, a W/B ratio of approximately 0.28, and an SFC of around 22 kg/m3 resulted in high workability in terms of slump. While a notable increase in compressive strength was observed when employing an L/d ratio of approximately 70, a W/B ratio of around 0.28, and the maximum SFC of 29 kg/m3, as confirmed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis.

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Section: Microstructure Of Hpfrcsmentioning

confidence: 99%

Physicomechanical Behavior of High-Performance Concrete Reinforced with Recycled Steel Fibers from Twisted Cables in the Brittle State—Experimentation and Statistics

Chetbani,

Zaitri,

Tayeh

et al. 2023

Buildings

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“…In order to improve the performance of structures compared to conventional RC structures, various kinds of high-performance materials for members were studied [9,10]. As an advanced class of concrete material, Ultrahigh-performance concrete (UHPC) is a mixture of reactive powder concrete and fiber-reinforced materials, characterized by particle packing, a low water-to-binder ratio, and dense microstructure [11][12][13][14]. Because of its superior mechanical properties, extreme durability, and good energy dissipation characteristics, UHPC has attracted increasing applications in new construction and retrofitting projects [15][16][17][18], like high-rise buildings, bridges, railway structures, offshore structures, and so on.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Fatigue Behavior of Reinforced UHPC-NC Composite Beams under Cyclic Loading

Wang,

Ji,

et al. 2024

Materials

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Ultra-high-performance concrete (UHPC), a new cement-based material that offers high mechanical strength and good durability, has been widely applied in construction and rehabilitation projects in recent years. An optimum bending system is achieved by positioning the UHPC layer at the bottom tensile zone of the composite beam and placing the normal-strength concrete (NC) layer at the upper compression zone, which is described as the UHPC-NC composite beam. The fatigue behavior of reinforced UHPC-NC composite beams was described in this study, with an emphasis on the effects of UHPC layer thickness and fatigue load level on the fatigue life of the beam, deformation of the interface between UHPC and NC layers, as well as the bending stiffness of the beam. A total of 9 reinforced UHPC-NC composite beams were tested under cyclic loading. The test variables include UHPC layer thicknesses (zero, 200, and 360 mm), reinforcement ratios (1.184% and 1.786%), and the upper load levels (0.39~0.65). The results showed that good bonding had been achieved without delamination between UHPC and NC layers prior to the final fatigue failure of the beam, and the bending stiffness of the composite beam experienced a three-stage reduction under cyclic loading. Furthermore, an equation was proposed to predict the stiffness reduction coefficient of UHPC-NC composite beams under cyclic loading.

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“…In recent decades, UHPFRC has attracted more interest as a result of its outstanding features, such as high strength, high ductility, better impact resistance, very low permeability, excellent durability, and wear resistance. [1][2][3] UHPFRC is defined as a ductile, high-strength material created by containing quartz powder, fine silica sand, high-range silica sand, steel or organic fibers, a high range water reducer, and a very low water/binder ratio. [4][5][6] In recent years, numerous researchers [7][8][9][10][11] investigated the effects of fiber types, surface area, characteristics of fiber (strength, shape, and aspect ratio), fiber orientation, and fiber contact on the mechanical properties of UHPFRC.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of hybrid steel, polypropylene, polyvinyl alcohol, and jute fibers on the properties of ultra‐high performance fiber reinforced concrete exposed to elevated temperature

Ali,

Elsayed,

Tayeh

et al. 2023

Structural Concrete

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Evaluation of the effects of different fiber types with different ratios on the mechanical properties and explosive spalling prevention of Ultra‐High Performance Fiber Reinforced Concrete (UHPFRC) at elevated temperatures is the primary objective of the experimental work. Several fiber types, including steel fiber, polypropylene fiber, polyvinyl alcohol fiber, and natural jute fiber were used. Eight UHPFRC mixes were cast comprising the different hybrid fiber types. The results show that replacing polypropylene, polyvinyl alcohol, and jute fibers with steel fiber decreases the fresh and hardened properties of unheated UHPFRC while increasing durability. The existence of hybrid fibers improves the fire resistance of UHPFRC and fully prevents explosive spalling because of a considerable improvement in permeability. According to the test results, the optimum replacement ratio for UHPFRC mix is to replace polyvinyl alcohol fiber with an equivalent volume fraction of steel fiber, as it has a slight influence on the mechanical properties and prevented explosive spalling.

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Microstructure of ultra-high-performance concrete (UHPC) – A review study

Cited by 73 publications

References 90 publications

Physicomechanical Behavior of High-Performance Concrete Reinforced with Recycled Steel Fibers from Twisted Cables in the Brittle State—Experimentation and Statistics

Physicomechanical Behavior of High-Performance Concrete Reinforced with Recycled Steel Fibers from Twisted Cables in the Brittle State—Experimentation and Statistics

Experimental Research on Fatigue Behavior of Reinforced UHPC-NC Composite Beams under Cyclic Loading

Effect of hybrid steel, polypropylene, polyvinyl alcohol, and jute fibers on the properties of ultra‐high performance fiber reinforced concrete exposed to elevated temperature

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