Use of iron ore tailings and sediments on pavement structure

Sá, Thomas Schatzmayr Welp; Oda, Sandra; Balthar, Vivian Karla Castelo Branco Louback Machado; Filho, Romildo Dias Tolêdo

doi:10.1016/j.conbuildmat.2022.128072

Cited by 25 publications

(12 citation statements)

References 14 publications

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“…Desde a Revolução industrial há uma demanda cada vez maior de minerais e consequentemente de rejeitos também (SCHATZMAYR et al, 2022). Durante os processos de extração e beneficiamento de minérios, grandes quantidades de resíduos são produzidas (IPEA, 2012).…”

Section: Introductionunclassified

“…Destaca-se ainda o uso como estabilizante de blocos de terra comprimida (NAVARRO et al, 2019) que demonstrou aumento na resistência a compressão e diminuição da absorção por capilaridade em teores incorporados com até 30% de RMF. Como estabilizante para pavimentação, foi analisado que porcentagens entre 10 e 20% de rejeito e obtiveram valores adequados de resistência do pavimento e se assemelharam com amostras equivalentes ao solocimento para a pavimentação (SCHATZMAYR et al, 2022). Segundo os autores, os valores satisfatórios podem estar relacionados à nova distribuição granulométrica e, consequentemente, a um melhor empacotamento das partículas (SCHATZMAYR et al, 2022); Estudos demonstram, entre diversas características do RMF, o comportamento inerte e o formato de partículas angulares e irregulares, superfície porosa e rugosa, além da presença relevante de minerais, como o ferro (SHETTIMA et al, 2018;ZHAO;FAN;SUN, 2014).…”

Section: Introductionunclassified

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Correção De Solos Para Taipa De Pilão Com Rejeito De Mineração: Análise Da Literatura

LAGE,

SANTOS

2023

IMPÁCT

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Minas Gerais stands out asone of the main iron ore extraction regions in Brazil, the world's second largest producer. During this extraction, large amounts of waste are generated. In the Civil Engineering and Architecture sector, there is the challenge of presenting construction solutions with less environmental impact. Rammed earth emerges as a sustainable construction technique due to its low embodied energy compared to conventional techniques. Therefore, this paper proposes to analyze the possibility of using iron ore tailings (RMF) as a physical stabilizer for rammed earth soils. No research on this use specifically was found. However, it was found that RMF can be viable for grain size correction of rammed earth soils or as a substitute for base materials due to its suitable physical, chemical and mineralogical characteristics, especially when requiring percentages of sand, fine sand or silt.

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Section: Introductionunclassified

Correção De Solos Para Taipa De Pilão Com Rejeito De Mineração: Análise Da Literatura

LAGE,

SANTOS

2023

IMPÁCT

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“…Excessive exploitation of river sand will lead to the destruction of ecological balance [5]. At present, the utilization of waste is encouraged, and about 300 million tons of tailings resources are discarded every year in China [6,7]. A small part of these waste tailings is used for backfilling, and their overall utilization is less than 15% [8].…”

Section: Introductionmentioning

confidence: 99%

Modification of Iron-Tailings Concrete with Biochar and Basalt Fiber for Sustainability

Chen

Song

et al. 2022

Sustainability

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Currently, less than 15% of waste iron tailings are utilized. Iron tailings can be used as fine aggregate in concrete, but this kind of concrete has no coarse aggregate, resulting in low strength. Additionally, iron tailings contain some heavy metals, which will cause environmental pollution if improperly treated. In this study, the mechanical properties, sulfate resistance, and pore structure distribution of basalt fiber-biochar-concrete (PFB) were studied. Where basalt is to enhance the mechanical properties of samples, and biochar is to adsorb heavy metals in iron tailings, to prepare environmentally friendly materials. Unconfined compressive strength (UCS) test, flexural strength (FS), sulfate immersion test, leaching behavior, and mercury intrusion porosimetry (MIP) test were used to study the performance of the samples, and X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), and scanning electron microscope (SEM) was used to characterize the samples, explaining the change mechanism of the macroscopic test. The results show that the compressive strength of PFB increased by 2.5% but the flexural strength increased by 12%. The basalt and biochar improve the pore size distribution of samples, that is, the pore size greater than 10 nm is reduced while the pore size between 2 and 6 nm is increased. Biochar can effectively adsorb heavy metals of Cu, Zn, Pb, and Cd, and their leaching concentration is reduced by 50–70%. Basalt fiber improves the mixing performance of concrete, while biochar with a small particle size fills the micro pores in concrete; this paper provides a new idea of sustainability for the preparation of environmentally friendly materials and the utilization of waste iron tailings.

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“…However, it showed poor performance at lower temperatures and poor resistance to deleterious water damage. Sá et al ( 20 ) investigated the addition of mining tailings to soils for use in base and sub-base layers of pavements. The addition of 10% and 20% of tailings reduced compressive strength, but the values were within the resistance limit established for use as a base layer for pavements.…”

mentioning

confidence: 99%

“…Thus, reusing or recycling these wastes minimizes the environmental impact and promotes sustainable development. An alternative is to add these tailings in pavement layers, such as base, sub-base, and subgrade, to reduce the consumption of natural resources and promote a new destination for mining tailings ( 20 ).…”

mentioning

confidence: 99%

Viability of Asphalt Mixtures with Iron Ore Tailings as a Partial Substitute for Fine Aggregate

de Moraes,

Neto,

Lucena

et al. 2023

Transportation Research Record: Journal of the Transportation R

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Dark colors aggravate the absorption and accumulation of heat in urban centers in the layers of asphalt coating. These problems can be minimized by incorporating materials that increase the albedo on these pavements. The use of waste in the industry has been encouraged, and an alternative is iron ore tailing (IoT), whose material comes from processing iron ore. The circular economy encourages a change in waste disposal after project decommissioning, encouraging the transformation, reuse, and recycling of waste. Therefore, this research investigated the influence of percentages of IoT in the contents (7.5%, 10.0%, and 12.5%) as a substitute for fine natural aggregate on hot asphalt mixtures’ mechanical and thermal performance. The statistical variance test (ANOVA) was used to validate the obtained data. An economic analysis concerning the costs of production and recovery of asphalt mixtures was carried out using the Present Net Value. Asphalt mixtures with IoT were evaluated with regard to the environmental aspect using the circularity index. Among the asphalt mixtures analyzed, the one produced with 12.5% was the most viable. The results showed a gain in mechanical performance concerning tensile strength, resilient modulus, fatigue, and permanent deformation of this mixture, as well as a reduction in production costs per kilometer of highway. The use of 12.5% provided a greater circularity and a reduction of the surface temperature of the pavement by 2.9°C. IoT is viable in constructing highways close to places that produce iron ore.

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Use of iron ore tailings and sediments on pavement structure

Cited by 25 publications

References 14 publications

Correção De Solos Para Taipa De Pilão Com Rejeito De Mineração: Análise Da Literatura

Correção De Solos Para Taipa De Pilão Com Rejeito De Mineração: Análise Da Literatura

Modification of Iron-Tailings Concrete with Biochar and Basalt Fiber for Sustainability

Viability of Asphalt Mixtures with Iron Ore Tailings as a Partial Substitute for Fine Aggregate

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