Effect of Iron Tailings and Slag Powders on Workability and Mechanical Properties of Concrete

Wu, Ruidong; Shen, Yu; Liu, Juanhong; Linian, Cheng; Zhang, Guangtian; Zhang, Yueyue

doi:10.3389/fmats.2021.723119

Cited by 19 publications

(5 citation statements)

References 25 publications

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“…Also, based on the TG curves of the three samples shown in Figure 12, it can be concluded that the contents of ettringite and C-(A)-S-H gels of C > D12 > D16 were 12.3%, 10.9%, and 9.9%, respectively, and the Ca(OH) 2 contents of C > D16 > D12 were 2.7%, 1.2%, and 1.1%, respectively. The content of carbonate of C > D12 > D16 was 7.3%, 2.4%, and 2.2%, respectively, which shows that the hydration product ettringite, C-S-H gel, and the change in calcium hydroxide content are the main factors causing the 28 d compressive strength of the SCMs [2].…”

Section: Hydration Products' Quantitative Analysis Test Resultsmentioning

confidence: 87%

“…Iron tailings (IOTs) are waste residue with the dual characteristics of secondary resources and environmental pollution produced after ore dressing, which is the main component of industrial solid waste [1][2][3][4]. Data show that China's existing IOT stockpile has exceeded 5 billion tonnes, and the annual emissions of new IOTs are nearly 300 million tonnes, but the comprehensive utilisation rate of IOTs is only 27.69% [5].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties and Hydration Mechanism of Iron Tailings–Cement-Based Supplementary Cementitious Materials

Hu,

Gu,

Liu

et al. 2024

Buildings

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The preparation of cement-based supplementary cementitious materials is an important method for the efficient use of iron tailings and the reduction in CO2 emissions. The aim of this study is to improve the reactivity of iron tailings by mixing them with steel slag, slag, and fly ash through orthogonal tests to solve the problem that iron tailings cannot be utilised on a large scale. The compressive strength, hydration products, and microstructure of the iron tailings–cement-based supplementary cementitious materials were investigated using ICP-OES, XRD, TG, FTIR, and SEM. The results revealed that each solid waste raw material played a distinct role in the hydration reaction. In the iron tailings–cement-based supplementary cementitious materials system, steel slag provided Ca2+, OH−, and Si4+ ions, slag provided Ca2+ and Al3+ ions, fly ash contributed a significant amount of Ca2+ and Al3+ ions, and iron tailings offered more nucleation sites and some Si4+ ions for the hydration products. Moreover, there was a synergistic effect among these four materials, promoting the formation of hydration products such as ettringite, C-(A)-S-H gels, and others. When the proportion of IOTs:SS:FA:SL was 9:8:8:2, the highest 7 d compressive strength of cementitious material was 24.8 MPa. When the proportion of IOTs:SS:FA:SL was 9:6:8:4, the highest 28 d compressive strength of cementitious material was 35.0 MPa. This study provides a comprehensive solution for the utilisation of iron tailings and contributes to the high-value green utilisation of solid waste.

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Section: Hydration Products' Quantitative Analysis Test Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Hydration Mechanism of Iron Tailings–Cement-Based Supplementary Cementitious Materials

Hu,

Gu,

Liu

et al. 2024

Buildings

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“…The slump cone used in the test had a height of 300 mm, a top diameter of 100 and a bottom diameter of 200 mm. The detailed procedure for the slump test is descr as follows [22][23][24]: Initially, the necessary tools, including the concrete sample, a s slump cone, a metal rod, a trowel, scales, a measuring tape, and other equipment, w prepared. The concrete sample was prepared on-site and tested within 30 min of mix The concrete was poured into a clean, oil-free slump cone; filled to the top; and ge vibrated with a metal rod to remove air pockets and level the surface.…”

Section: Design Schemementioning

confidence: 99%

The Effect of Copper Tailings Sand on the Workability and Mechanical Properties of Concrete

Zhang,

Gao,

Wang

2024

Buildings

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Concrete materials are widely used in engineering projects, with fine aggregates (sand) being a key component currently in short supply. Copper tailings sand, a waste by-product of copper mining, accumulates in large quantities in tailings dams. Recycling and reusing this waste sand is crucial for environmental sustainability. This paper investigated the incorporation of copper tailings sand into concrete as a partial replacement for fine aggregates and evaluated its effects on concrete’s workability and mechanical properties. The experimental results indicate that the addition of copper tailings sand reduced the workability and compressive strength of concrete. Specifically, at a 60% substitution rate, the slump of the concrete was reduced by 15%, and the axial strength was closest to that of ordinary concrete, with a reduction of 2.5%. As the proportion of copper tailings sand increased from 0% to 80%, the average axial strength decreased from 37.3 MPa to 34.9 MPa, and stiffness decreased by approximately 6.43%. A complete stress–strain curve equation was proposed based on fitting relevant parameters, closely aligning with experimental data. Moderately adding tailings sand can help address the issue of large amounts of waste sand accumulating in tailings dams while maintaining acceptable concrete properties.

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“…Wu et al (2021) [11] investigated concrete's workability and long-term mechanical qualities of iron ore tailings powder. The results of a study on the effects of increasing iron tailings powder doses on slump, expansion, flexural strength, splitting tensile strength, and compressive strength of concrete at different ages in C30 and C50 concrete revealed that iron tailing powder properly incorporated improves concrete's working performance and significantly reduces the time loss of fluidity.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study on the Use of Iron Ore Tailings as Fine Aggregate with Glass Fibre in Concrete

Hameed,

Raju,

Nagarajan

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Concrete is the most widely used building material in the world, but its production has significant environmental consequences, including high carbon emissions and natural resource depletion. As a result, there is an increasing interest in the development of sustainable concrete technologies that reduce concrete’s environmental footprint while maintaining its performance and durability. Partially replacing fine aggregate with industrial waste is one such approach. It is a great practice for developing sustainable concrete that can help with environmental problems caused by the dumping of these waste materials at the same time maintaining the performance of concrete. It also provides economic and social benefits in addition to the environmental benefits. iron ore tailings is one such industrial waste that is the by-product of iron ore beneficiation process which has shown the potential for partial replacement of fine aggregate in concrete. In addition, glass fibre is added to improve the tensile property of concrete. A concrete mix of M20 grade were prepared by replacing fine aggregate with iron ore tailing at replacement level 15%, 25%, and 35% and the optimum replacement percentage was obtained. Further, glass fibre was added at the dosage of 0.5% by the weight of cement to the mix with optimised replacement of iron ore tailings and tests were conducted. This work also examines concrete’s physical, mechanical and durability properties with partial replacement of fine aggregate with iron ore tailings and glass fibre by conducting tests on strength and durability. Results obtained indicates incorporation of iron ore tailing with concrete reduces the workability of concrete, and the addition of glass fibre improved the compressive strength and split tensile strength. Durability tests show an increase in water absorption with the addition of iron ore tailings and a medium level of chloride penetration. The study showed the use of iron ore tailing as a sustainable alternative to fine aggregate in concrete.

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Effect of Iron Tailings and Slag Powders on Workability and Mechanical Properties of Concrete

Cited by 19 publications

References 25 publications

Mechanical Properties and Hydration Mechanism of Iron Tailings–Cement-Based Supplementary Cementitious Materials

Mechanical Properties and Hydration Mechanism of Iron Tailings–Cement-Based Supplementary Cementitious Materials

The Effect of Copper Tailings Sand on the Workability and Mechanical Properties of Concrete

Feasibility Study on the Use of Iron Ore Tailings as Fine Aggregate with Glass Fibre in Concrete

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