Carbonation Resistance and Pore Structure of Mixed-Fiber-Reinforced Concrete Containing Fine Aggregates of Iron Ore Tailings

Zheng, Wenbo; Wang, Sheliang; Quan, Xiaoyi; Qu, Yang; Mo, Zhikai; Lin, Chang-jun

doi:10.3390/ma15248992

Cited by 9 publications

(5 citation statements)

References 33 publications

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“…Based on the slower growth rate of the experimental data, the best fit was chosen at b = 0.5. The correlation is significant, with R 2 = 0.51, which is consistent with previous findings in Zheng [67], Zheng [68] and Wang [26]. This implies that the change rule of all of the NZS 3101 [69] 0.44 × (f UCS ) 0.5 NZS 3101 [69] 0.60 × (f UCS ) 0.5 EC-04 [70] 0.30 × (f UCS ) (2/3) EC 04 [70] 0.435 × (f UCS ) (2/3) GB 50010 [71] 0.19 × (f UCS ) 0.75 DG/TJ [72] 0.75 × (f UCS ) 0.5 JSCE [73] 0…”

Section: Flexural Strength (Fs)supporting

confidence: 91%

“…Based on the slower growth rate of the experimental data, the best fit was chosen at b = 0.5. The correlation is significant, with R 2 = 0.51, which is consistent with previous findings in Zheng [67], Zheng [68] and Wang [26]. This implies that the change rule of all of the strength indexes is similar for the fiber types and contents, and the best fiber combination is B0.25P0.05.…”

Section: Flexural Strength (Fs)supporting

confidence: 89%

“…Figure 18 displays the correlation between the STS and UCS of all mortar specimens. The correlation between the STS and UCS is significant, with R 2 = 0.85, which is also in good agreement with the results in Zheng [67] and Zheng [68].…”

Section: Standards Fstssupporting

confidence: 89%

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Hybrid Effect of Basalt and Polyacrylonitrile Fibers on Physico-Mechanical Properties of Tailing Mortar

Xu,

Pi,

Huang

et al. 2024

Buildings

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In this study, 50% iron ore tailings (IOTs) were used to prepare the cemented mortar at low economic costs and with great environmental benefits. Basalt fiber (BF) and polyacrylonitrile fiber (PANF) were added to the tailing mortar to improve the comprehensive performance of tailing mortars, including BF (0~0.5%), PANF (0~0.05%) and the combination of them. The results show that the addition of BF and PANF can significantly improve the ultrasonic velocity, uniaxial compressive strength (UCS), split-tensile strength (STS), flexural strength (FS) and toughness of the tailing mortar. A novel finding is that the enhancement of hybrid fibers is much better than single fiber, and the best hybrid fiber combination is B0.25P0.05 (0.25 wt% BF and 0.05 wt% PANF), because this combination not only causes the most considerable increase in strength but also possesses great cost-effectiveness. Compared to the B0P0 group without fibers, the maximum increments of B0.25P0.05 in UCS, STS and FS are 45.74%, 52.33% and 15.65%, respectively. It is evidenced that the improvement in STS is the largest because the fibers have good cracking resistance and bridging effect in the tailing mortar. The scanning electron microscope (SEM) further confirms that too many hybrid fibers will agglomerate and produce more voids, which is harmful to the development of the internal structure. Beyond B0.25P0.05, the hydration products are also reduced due to the decrease in nucleation sites, observed by combining X-ray diffraction (XRD) tests. Therefore, it is suggested that the hybrid fibers containing 0.25% BF and 0.05% PANF should be used in this tailing mortar.

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Section: Flexural Strength (Fs)supporting

confidence: 91%

“…Based on the slower growth rate of the experimental data, the best fit was chosen at b = 0.5. The correlation is significant, with R 2 = 0.51, which is consistent with previous findings in Zheng [67], Zheng [68] and Wang [26]. This implies that the change rule of all of the strength indexes is similar for the fiber types and contents, and the best fiber combination is B0.25P0.05.…”

Section: Flexural Strength (Fs)supporting

confidence: 89%

See 1 more Smart Citation

Hybrid Effect of Basalt and Polyacrylonitrile Fibers on Physico-Mechanical Properties of Tailing Mortar

Xu,

Pi,

Huang

et al. 2024

Buildings

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“…Research has demonstrated that the incorporation of fibers [21,22] into the filling process can effectively retard the degradation of the filling material [23,24]. Moreover, the bridging effect of fibers within the filling material [25][26][27] significantly enhances the mechanical properties of the cemented filling [28,29]. Following laboratory tests, Li [30] concluded that the unconfined compressive strength of fiber-reinforced cemented tailings backfill (FRCTB) increased with the increase in polypropylene (PP) fiber dosage, and the peak strain also increased from 0.39% to 1.45%.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Multi-Size Basalt Fiber on Cemented Paste Backfill Mechanical Properties and Meso-Structure Characteristics

Chen,

Jiao,

Liu

et al. 2023

Minerals

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As the mine enters the deep mining stage, there is a need to enhance the compressive strength and toughness of the backfill. The objective of this study is to examine the mechanical properties of cemented tailings backfill after the incorporation of multi-size fibers and to validate the toughening mechanism of basalt fibers (BFs). To achieve this, a series of basic mechanical property tests for multi-size BFs mixing were devised, accompanied by industrial computerized tomography (CT) scanning and discrete element simulation. This study shows that the compressive strength increases and then decreases with the increase of BF dosage at a certain percentage of each size, and the splitting tensile strength gradually increases with the increase of BF dosage. The compressive strength tends to decrease and then increase, and the splitting tensile strength increases and then decreases as the fiber size ratio changes. The distribution of cemented tailings backfill and BF within the discrete element model is random. A few BF cannot play a bridging role; however, a moderate amount of BF is relatively uniformly distributed in the model to form a network structure, which generates a bond between the particles and the matrix and can effectively limit the expansion path of cracks and enhance the toughness.

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“…[15] aim to identify the influence of the incorporation of iron ore tailings (IOT) obtained from the Germano dam in Brazil in the substitution of sand fractions in concrete. 15%, 30%, 50%, and 70% iron tailings were used to replace the natural sand in concrete, and 1.5% steel fiber and 0-0.75% PVA fibers were added to the iron tailings concrete [16]. Other influential work includes [17].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Reinforced Concrete Beam Contain-ing Iron Ore Tailings as Partial Replacement of Sand

Abubakar

2023

EIJET

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The production of industrial and agricultural residual byproducts can generate significant environmental impact. In response, researchers have begun incorporating supplementary materials made from agro-industrial wastes to create more sustainable concrete. However, testing the performance of these waste-based concrete mixtures can be time-consuming and expensive. To address this issue, this study utilized three-dimensional non-linear Finite Element simulation using the ABAQUS/CAE software to predict the behaviour of a reinforced concrete beam that incorporated 20% IOT as partial sand replacement. The simulation successfully predicted the damage behaviour of the 20% IOT concrete, indicating the potential of this modelling approach to accurately predict the performance of waste-based concrete mixtures in various designs. Keywords: ABAQUS; Iron Ore Tailings; Numerical Analysis; Reinforced Concrete Beam.

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Carbonation Resistance and Pore Structure of Mixed-Fiber-Reinforced Concrete Containing Fine Aggregates of Iron Ore Tailings

Cited by 9 publications

References 33 publications

Hybrid Effect of Basalt and Polyacrylonitrile Fibers on Physico-Mechanical Properties of Tailing Mortar

Hybrid Effect of Basalt and Polyacrylonitrile Fibers on Physico-Mechanical Properties of Tailing Mortar

The Influence of Multi-Size Basalt Fiber on Cemented Paste Backfill Mechanical Properties and Meso-Structure Characteristics

Numerical Investigation of Reinforced Concrete Beam Contain-ing Iron Ore Tailings as Partial Replacement of Sand

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