Flexural Fracture Toughness and First-Crack Strength Tests of Steel Fiber-Silica Fume Concrete and Its Engineering Applications

Zhang, J. P.; Liu, L. M.; Zhu, Zhigang; Zhang, F. T.; Cao, Juncai

doi:10.1007/s11223-018-9956-y

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…After the laying of the model, an external force is applied above one of the models to simulate the effect of the ultrathick loose layer. According to Table 1, the thickness of the ultrathick loose layer is 724.7 m, and the density of the loose layer is about 2210 kg/m 3 . The stress at the top of the bedrock (gravity density multiplied by buried depth) is calculated to be about 15.70 MPa.…”

Section: The Law Of Bedrock Movement Under Ultrathick Loose Layermentioning

confidence: 99%

“…The process of ground subsidence is always accompanied by water resources loss, which will inevitably cause damage of ecological environment. Therefore, in the process of coal mining, to minimize ground subsidence is a major aspect of protecting ecological environment [2,3]. Above the coal seam, the overlying strata can be divided into two parts: bedrock and loose layer.…”

Section: Introductionmentioning

confidence: 99%

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Analysis on Subsidence Law of Bedrock and Ultrathick Loose Layer Caused by Coal Mining

Shi

et al. 2021

Geofluids

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In the process of coal mining, when the buried depth is large and the loose layer is thick, the ground subsidence tends to be abnormal, thus causing great damage to the surface ecological environment. In order to reveal the mechanism of mining ground subsidence under ultrathick loose layer, taking 1305 working face of a mine as the background, the law of mining ground subsidence under ultrathick loose layer was analyzed through field measurement. The law of bedrock subsidence is analyzed by similar simulation test, and the role of ultrathick loose layer in bedrock subsidence is quantitatively analyzed. The hydrophobic settlement model of ultrathick loose layer is established by settlement theory calculation, and the law of ground subsidence caused by hydrophobic of ultrathick loose layer is analyzed. The results show that the ground subsidence is mainly composed of bedrock subsidence and hydrophobic settlement of ultrathick loose layer. The maximum ground subsidence measured in the field is 4.201 m, the bedrock surface subsidence obtained by the simulation test of similar materials is 3.552 m, and the subsidence of ultrathick loose layer obtained by hydrophobic settlement analysis is 0.58 m. Adding the subsidence of bedrock surface and the subsidence of ultrathick loose layer, the ground subsidence is 4.132 m. It is in good agreement with the total ground subsidence measured in the field, which verifies the rationality that the ground subsidence mainly includes bedrock subsidence and hydrophobic settlement of ultrathick loose layer.

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Section: The Law Of Bedrock Movement Under Ultrathick Loose Layermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis on Subsidence Law of Bedrock and Ultrathick Loose Layer Caused by Coal Mining

Shi

et al. 2021

Geofluids

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“…e used cement was Portland cement type 42.5R, whereas silica fume was used as partial cement replacement. e use of silica fume is known to positively affect the mechanical properties of concrete because of its effective reaction with the cement components [33][34][35]. To assure an acceptable workability, the high range water reducer Master Glenium 51 was used in all mixtures.…”

Section: Concrete Mixture and Materialsmentioning

confidence: 99%

Experimental Investigation on the Effect of Steel Fibers on the Flexural Behavior and Ductility of High‐Strength Concrete Hollow Beams

Abbass

Abid

Özakça

2019

Advances in Civil Engineering

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In this study, an experimental work was directed toward comparing the flexural behavior of solid and hollow steel fiber-reinforced concrete beams. For this purpose, eight square cross-sectional beam specimens, four solid and four hollow, were prepared. One concrete mixture with four different steel fiber contents of 0, 0.5, 1.0, and 1.5% were used. The side length of the central square hole was 80 mm, whereas the cross-sectional side length was 150 mm. All beams were tested under four-point monotonic loading until failure. In addition to the solid and hollow beams, cylinders were cast to evaluate the compressive strength, splitting tensile strength, and modulus of elasticity, whereas prisms were used to conduct the fracture test. The test results showed that all fibrous beams failed in flexure, whereas those without fiber exhibited flexural-shear failure. In general, the flexural behavior of fibrous-beams was superior to that of beams without fiber. The hollow beams with fiber contents of 0, 0.5, and 1.0% were observed to withstand lower loads at cracking, yielding, and peak stages compared with their corresponding solid beams; this was not the case for the 1.5% fiber hollow beam, which exhibited a higher peak load than its corresponding solid beam. Although all eight beams exhibited ductility indices higher than 3.7, hollow beams exhibited better ductility than solid beams, showing higher ductility index values.

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“…However, the inclusion of steel fibers substantially influences the tensile and flexural strength of concrete, leading to more optimal outcomes; this is because the steel fibers reinforce the concrete and increase the overall strength and durability of the concrete structure, which can be particularly beneficial in highstress conditions. Counting steel fibers to concrete is a highly effective approach to improving its strength and overall performance [8][9][10][11]. When the volume of steel fibre in concrete surpasses 1.5%, it remarkably reduces the strength properties of concrete, predominantly influencing the compression strength [12,13].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the strength properties of concrete modified with silica fume and steel fiber

Ahmadi,

Lallotra

2024

E3S Web Conf.

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Concrete is a widely used building material. It has excellent compressive strength but is brittle and relatively weak in tension. This experimental study aims to develop ductile and high-strength concrete by incorporating silica fume and steel fibers. Two types of steel fibers with aspect ratios of 52 and 72 were employed at varying percentages (0.44%, 0.88%, and 1.76% by mass of cement content). Additionally, 8.5% silica fume by cement mass was added to the concrete mixture. A water-to-cement (W/C) ratio of 0.42 and a slump of 100 mm are maintained. Substituting cement with silica fume improves the concrete's mechanical properties and elastic modulus. Moreover, adding steel fibers enhanced flexural and tensile strength. Increasing the percentage of silica fume and steel fibers correlated with higher compressive strength, while the aspect ratio of steel fibers has an inverse effect on compressive strength, with lower aspect ratios exhibiting a higher compressive strength. Furthermore, as the percentage of silica fume and steel fibers increases, the splitting tensile and flexural strength also improve, with the aspect ratio directly influencing these strengths, higher aspect ratios resulting in superior tensile and flexural strength. Ultimately, this investigation demonstrates that the strength properties of concrete rely on the content of silica fume, steel fibers, and the aspect ratio of the steel fibers.

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Flexural Fracture Toughness and First-Crack Strength Tests of Steel Fiber-Silica Fume Concrete and Its Engineering Applications

Cited by 15 publications

References 18 publications

Analysis on Subsidence Law of Bedrock and Ultrathick Loose Layer Caused by Coal Mining

Analysis on Subsidence Law of Bedrock and Ultrathick Loose Layer Caused by Coal Mining

Experimental Investigation on the Effect of Steel Fibers on the Flexural Behavior and Ductility of High‐Strength Concrete Hollow Beams

Experimental study on the strength properties of concrete modified with silica fume and steel fiber

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