Evaluation of iron ore tailings as replacement for fine aggregate in concrete

Shettima, Ali Umara; Hussin, Mohd Warid; Ahmad, Yusof; Mirza, Jahangir

doi:10.1016/j.conbuildmat.2016.05.095

Cited by 332 publications

(129 citation statements)

References 35 publications

(36 reference statements)

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“…Most published research has revealed that mortar or concrete containing tailings as fine aggregate had a higher water absorption percentage due to capillarity [26] or higher fine content and specific surface area values of tailings [38]. Shettima et al [27] described that concrete with tailings absorbed more water than control specimen; but water absorption decreased with increase in the age as shown in Figure 6, for the tailings occupied the macro and micro pores in the mix. However, Sant'ana et al [36] confirmed that the water absorption of concrete reduced up to the inclusion of 80% tailing substitution as fine aggregate, for tailings occupied the pores of the cement paste because of the fill effect.…”

Section: Effect On Hardened Propertiesmentioning

confidence: 97%

“…Authors concluded that this was due to the finer particles of tailings which filled the pores and optimized the pore structure [27]. Table 2 demonstrates the increase of compressive strength of concrete with tailings.…”

Section: Effect On Hardened Propertiesmentioning

confidence: 99%

“…A decrease in a slump was observed up to the inclusion of 100% tailings substitution as fine aggregate. This might be attributed to particle size and surface texture of tailings, which may demand more water and hence reduce the workability [27,40,41]. The setting time of mortar extended when the tailings were incorporated as a replacement of fine aggregate, for the heavy metals in tailings retarded the hydration of cement by forming a low permeability layer around cement clinker un-hydrated grains [23].…”

Section: Effect On Fresh Propertiesmentioning

confidence: 99%

“…The same was found to be true for tensile strength. Shettima et al [27] considered that a 25% tailing substitution as a fine aggregate was the optimum concentration for the tensile strength of concrete, and the tensile strengths of concrete with tailings were always higher than the control concrete. In contrast, Gallala et al [42] reported that the tensile strength decreased for the concrete containing tailings as fine aggregate, and only at 20% and 25% replacement of fine aggregate with tailings, the tensile strength of concrete was very close to the control specimen.…”

Section: Effect On Hardened Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

Utilization of tailings in cement and concrete: A review

Gou

Zhou

Then

2019

Science and Engineering of Composite Materials

146

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One of the advantages of cement and the cement concrete industry in sustainability is the ability to utilize large amounts of industrial solid wastes such as fly ash and ground granulated blast furnace slag. Tailings are solid wastes of the ore beneficiation process in the extractive industry and are available in huge amounts in some countries. This paper reviews the potential utilization of tailings as a replacement for fine aggregates, as supplementary cementitious materials (SCMs) in mortar or concrete, and in the production of cement clinker. It was shown in previous research that while tailings had been used as a replacement for both fine aggregate and cement, the workability of mortar or concrete reduced. Also, at a constant water to cement ratio, the compressive strength of concrete increased with the tailings as fine aggregate. However, the compressive strength of concrete decreased as the replacement content of the tailings as SCMs increased, even whentailings were ground into smaller particles. Not much research has been dedicated to the durability of concrete with tailings, but it is beneficial for heavy metals in tailings to stabilize/solidify in concrete. The clinker can be produced by using the tailings, even if the tailings have a low SiO2 content. As a result, the utilization of tailings in cement and concrete will be good for the environment both in the solid waste processing and virgin materials using in the construction industry.

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Section: Effect On Hardened Propertiesmentioning

confidence: 97%

Section: Effect On Hardened Propertiesmentioning

confidence: 99%

Section: Effect On Fresh Propertiesmentioning

confidence: 99%

Section: Effect On Hardened Propertiesmentioning

confidence: 99%

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Utilization of tailings in cement and concrete: A review

Gou

Zhou

Then

2019

Science and Engineering of Composite Materials

146

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“…Figure 1 shows that the leaching residue in the Fan Kou mine is ultrafine with proportions of more than 99 wt % for particles less than 19 µm in diameter. An excess of ultrafine particles makes the slurry become a paste at lower mass concentrations, which cannot meet the high mass concentration transport requirements [22][23][24]. The physical properties and the chemical composition of the leaching residue and classified tailings are listed in Tables 1 and 2.…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

Feasibility of Recycling Ultrafine Leaching Residue by Backfill: Experimental and CFD Approaches

et al. 2017

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Large amounts of leaching residue are released into tailings dams from mines, and their acid content can cause environmental pollution. The aim of this study was to research the feasibility and value of a leaching residue backfill recycling method. The combination of property detection, laboratory tests (the neutralization method, strength test and diffusivity test) and numerical simulation methods (3D computational fluid dynamics (CFD) simulations of pipeline transportation properties) were used to assess the performance of the leaching residue backfill. The results show that backfill body with the cement:sand mass ratio of 1:3, the leaching residue:classified tailings ratio of 1:6, and slurry mass concentration of 71 wt % can meet the strength and pipeline self-flowing transportation requirements of mine backfill. The leaching residue is a good backfill aggregate, and its recovery ratio can reach 19.5 wt %. In addition, the recycling of leaching residue effectively alleviates the problem of mine waste emissions and protects the ecological environment surrounding the mining area. This study serves as a guide for the recycling of fine tailings and the environmental governance of the mining area.

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Mitigating the socioeconomic impacts of the mining industry through Social Technologies: Guidelines for technology transfer between universities and communities

Nogueira,

Costa,

Resende

et al. 2023

Corp Soc Responsibility Env

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The mineral sector causes socioeconomic and environmental impacts on the surrounding communities. Thus, Social Technologies (STs) developed by universities are an alternative for improving the quality of life of the people affected by mining activities. STs are a Latin American practice comprising solutions for social inclusion and economic development. Thus, this article critically investigates the impacts of mining and STs, reinforcing the potential applications of STs in this field. Additionally, the work discusses the possibilities of technology transfer from the university to society through a comprehensive literature review, and the authors developed guidelines to mitigate the impacts of mining activities using STs implementation with technology transfer as a tool. The literature review showed that, although multiple STs aim at social inclusion, the success of the ST depends on the socio‐technical suitability of each community, an efficient training process, and the capacity for self‐management by the social actors. The guideline created includes aspects of: approach and scenario reconstruction, mapping, identification of vocations, training, and technical support for affected communities. Additionally, the mining sector can use these guidelines as a Corporate Social Responsibility tool.

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Evaluation of iron ore tailings as replacement for fine aggregate in concrete

Cited by 332 publications

References 35 publications

Utilization of tailings in cement and concrete: A review

Utilization of tailings in cement and concrete: A review

Feasibility of Recycling Ultrafine Leaching Residue by Backfill: Experimental and CFD Approaches

Mitigating the socioeconomic impacts of the mining industry through Social Technologies: Guidelines for technology transfer between universities and communities

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