Dosage of interlocking paving with ornamental rock waste: An experimental design approach, particle packing and polluting potential

Bahiense, Alexandre Vianna; Alexandre, Jonas; Xavier, Gustavo de Castro; Azevedo, Afonso Rangel Garcez de; Monteiro, Sérgio Neves

doi:10.1016/j.cscm.2021.e00596

Cited by 6 publications

(3 citation statements)

References 44 publications

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“…Thus, this part of the cement is consistent with that of mineral powder [18,19]. Research pointed out that both low porosity and better coverage of aggregates could make the mixture show better performance [20]. Therefore, researchers had carried out a lot of research on the micro interface and void structure of CRME.…”

Section: Introductionmentioning

confidence: 73%

Effect of Fine Aggregate Gradation on Macro and Micro Properties of Cold Recycling Mixture Using Emulsified Asphalt

Zhang

et al. 2022

Coatings

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In order to explore the influence of fine aggregate on the macro and micro properties of cold recycling mixture using emulsified asphalt (CRME), mechanical and microscopic property tests were carried out. The indirect tensile strength (ITS), unconfined compressive strength (UCS) and triaxial shear strength of different fine aggregate gradation was measured for analyzing the effects of fine aggregate on the mechanical strength, triaxial shear resistance and fracture energy of CRME. Meanwhile, the surface morphologies and air voids distribution of different CRME were observed by scanning electron microscopy (SEM) and X-ray computed tomography (X-ray CT). The results show that fine aggregate has a significant effect on the mechanical strength and shear resistance of CRME. With the same water and asphalt content, the fracture energy and failure strain of the mixture with less fine aggregate (G3-2) decreased by 16.2% and 18.2%, respectively. The less content of powder there was, the fewer cement hydration products there were due to some cement being coated by emulsified asphalt and the “cement hydration products fiber” length being shorter. Approximately 70% of the AFt hydration products in the G3-2 mixture were in the range of 1–4 μm, while those in the G1 mixture were in the range of 4–8 μm. With the increase in filler content, the number of air voids in the volume range of 0.5 mm3 ≤ V < 5 mm3 in CRME decreased, and the number of air voids in the volume range of V < 0.5 mm3 significantly increased, while the equivalent radius of air voids decreased slightly with the increase in filler content.

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Section: Introductionmentioning

confidence: 73%

Effect of Fine Aggregate Gradation on Macro and Micro Properties of Cold Recycling Mixture Using Emulsified Asphalt

Zhang

et al. 2022

Coatings

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“…In this context, research has concentrated on the use of Fibro in various sectors, such as the ceramic industry, agriculture, polymer industry, asphalt paving, glass, cosmetics, paper, mortar, among others. The idea is to find efficient ways to reuse these materials, avoiding unnecessary disposal and reintroducing them into the economy (Almeida et al, 2023;Bahiense, 2021). While studies indicate that leveraging these materials is a viable alternative, there is a challenge in engaging companies in the industry to support and invest in these solutions.…”

Section: Figurementioning

confidence: 99%

Recovery of Synthetic Diamonds from Fines of Natural Stones Processing

Ponciano,

Bahiense,

Almeida

et al. 2024

RGSA

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Objective: The objective of this study is to investigate the flotation process of the fines from the processing of natural stones - Fibro, and to propose a methodology to recovery synthetic diamonds present in it. For this, this research analyzes the influence of the amount of solid mass in the pulp and the amount of reagents used in the process. Theoretical Framework: The productive chain of natural stones generates millions of tons of Fibro annually, which can cause environmental damage if not disposed of or treated properly. Considering that the principles of circular economy are relevant in the pursuit of sustainable development of the sector, it is emphasized that Fibro contains several mineral resources that can be used in other productive chains. In addition to the rock powders resulting from processing, there are other particles of interest such as synthetic diamond. The synthetic diamonds present in Fibro come from the diamond tools used in rock sawing and polishing. These diamond particles have a high added value, and some recovery methods have been implemented to capture these grains for reuse. Among the methods used for this purpose, flotation has obtained the best results in previous studies. Method: The methodology adopted for this research begins with the collection and sampling of the Fibro in the natural stone production industries. Then, this material was classified granulometrically through sieving, and the samples were then subjected to the flotation process. In flotation, the percentage of solids in the pulp and the amounts of collector and frother used in the process were tested. All untested parameters were kept constant, and only the variables under investigation were modified at different levels. The methodology followed an experimental design and it was applied regression models and response surfaces for data modeling. Results and Discussion: The results show that the most efficient solid percentage was 35% in conditioning and 25% in flotation. Regarding the quantities of reagents tested, the model generated by the response surface indicates which levels obtained the best results in terms of concentrate recovery rate. It was also noted that the amount of collector had little influence on the process, which can be inferred by the natural hydrophobicity of the diamond. Implications of the Research: The implications of this research include economic benefits for the natural stones industry from the possibility of entering a new market in the sector. As well as advances in circular economy by reusing industrial waste and developing new technologies for the use of these materials. These results have the potential to impact industrial sustainability and can expand the mining and metallurgy sector. Originality/Value: This study contributes to the mining industry by proposing an innovative flotation methodology to recover synthetic diamonds from the fines of processing of natural stones. The relevance and value of this research are evidenced by its ability to provide a practical and efficient solution, with potential positive impact on circular economy and industrial sustainability.

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“…O Espírito Santo é um grande protagonista nessa atividade econômica, responsável por um grande número de exportações, geração de emprego e renda (Bahiense, A. V. et al, 2021;Azevedo et. al, 2019), respondendo por cerca de 81,7% do total do faturamento e 76,2% do total do volume físico das exportações brasileiras de rochas (Chiodi Filho, 2018).…”

Section: Introductionunclassified

Impactos E Análise Do Desempenho Econômico Da Indústria De Rochas Ornamentais Do Espirito Santo Em Tempos De Pandemia

Bahiense,

Schreider,

Maurício

et al. 2023

Rev. Foco

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As rochas ornamentais fazem parte de um segmento do setor mineral que visa utilização de materiais rochosos para fins de ornamentação e revestimento. O Brasil possui um lugar significativo na produção mundial de rochas ornamentais, com destaque para o estado do Espirito Santo. Do ponto de vista econômico, o setor registrava entre os anos de 2015 à 2019 uma queda no seu número de exportações, tanto em faturamento quanto em produção. Não se esperava nada diferente em 2020 principalmente pelo fato de ter sido um ano de crise mundial, além das incertezas que a pandemia de COVID-19 poderia trazer. Este artigo tem como objetivo avaliar os impactos da pandemia na indústria de rochas ornamentais do estado do Espirito Santo, por meio de um levantamento de dados do desempenho econômico do setor em período anterior, durante e após a COVID-19, apresentando motivos e tendências para essa mudança. Foram pesquisados dados do desempenho do setor de rochas assim como outros segmentos econômicos, buscando correlações e os impactos da pandemia. Os resultados obtidos mostraram que ocorreu um aumento produtivo e de exportações nos anos de pandemia, que antes desta estava em declínio, fato que se destoou de alguns segmentos econômicos que sofreram maiores impactos devido as restrições impostas.

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Dosage of interlocking paving with ornamental rock waste: An experimental design approach, particle packing and polluting potential

Cited by 6 publications

References 44 publications

Effect of Fine Aggregate Gradation on Macro and Micro Properties of Cold Recycling Mixture Using Emulsified Asphalt

Effect of Fine Aggregate Gradation on Macro and Micro Properties of Cold Recycling Mixture Using Emulsified Asphalt

Recovery of Synthetic Diamonds from Fines of Natural Stones Processing

Impactos E Análise Do Desempenho Econômico Da Indústria De Rochas Ornamentais Do Espirito Santo Em Tempos De Pandemia

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