Optimization and dust emissions analysis of the air jigging technology applied to the recycling of construction and demolition waste

Waskow, Régis Pereira; Santos, Viviane Lopes Gschwenter dos; Ambrós, Weslei Monteiro; Sampaio, Carlos Hoffmann; Passuello, Ana; Tubino, Rejane Maria Candiota

doi:10.1016/j.jenvman.2020.110614

Cited by 18 publications

(13 citation statements)

References 20 publications

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“…164 The methodology used to obtain the depths of chloride penetration in the different concrete mixtures followed those described by Wee, Suryavanshi and Tin (2000) and Otsuki, Nagataki and Nakashita (1992), opting for a curing time in a wet room of 7 days and without the use of paint.…”

Section: Lifecycle Inventorymentioning

confidence: 99%

“…In the absence of reliable data, John and Agopyan (2000) propose to adopt a generation rate of 510 kg/inhab.year, which makes it possible to estimate an annual generation of 106 million tons in Brazil. Waskow et al (2020) addition that in Brazil, these residues have as main constituents inert materials such as aggregates, ceramics, mortar, and concrete. Within this context, the solid industrial waste mentioned above are the object of studies in the search for "ecologically correct" concrete, seeking to reduce environmental impacts through recycling, either by replacing Portland cement and/or replacing natural materials (GOLEWSKI, 2017;GURSEL;MARYMAN;OSTERTAG, 2016;HAYLES;SANCHEZ;NOEL, 2018;LIEW;SOJOBI;ZHANG, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Durability, life cycle cost and life cycle assessment of binary mixtures with fly ash, rice husk ash and concrete demolition waste

et al. 2022

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This study analyses, by means of lifespan cost and lifespan assessment, the production of binary concrete admixtures compound by artificial pozzolan and concrete demolition waste. Ten formulations were developed, differentiating them in terms of mixtures, binder and aggregate content, in order to verify their potential use in concrete columns. The replacements were 25% of Portland cement for fly ash and rice husk ash, 15% and 30% of natural coarse aggregates for concrete demolition waste. The results revealed that the mixtures with pozzolan and demolition waste showed higher resistance to chloride penetration. The lowest concrete cost was achieved in the highest compressive strength (35 MPa) and the concrete admixture containing 15% replacement of the natural coarse aggregate by the recycled concrete aggregate and 25% substitution of cement by rice husk ash can be classified as the most environmentally sustainable one, especially in carbon dioxide emissions, among the mixtures studied.

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Section: Lifecycle Inventorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Durability, life cycle cost and life cycle assessment of binary mixtures with fly ash, rice husk ash and concrete demolition waste

et al. 2022

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“…Dry jigs, in particular, have been described as a promising method for recycling and upgrading the quality of coarse aggregates from construction and demolition wastes (CDW) [48,49]. The results obtained by Sampaio et al [20] showed it to be possible to obtain recycled aggregates of composition that meet the minimum standards of quality of many countries.…”

Section: Applicationsmentioning

confidence: 99%

Jigging: A Review of Fundamentals and Future Directions

Ambrós

2020

Minerals

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For centuries, jigging has been a workhorse of the mineral processing industry. Recently, it has also found its way into the recycling industry, and the increasing concerns related to water usage has led to a renewed interest in dry jigging. However, the current scenario of increasing ore complexity and the advent of smart sensor technologies, such as sensor-based sorting (SBS), has established increasingly challenging levels for traditional concentration methods, such as jigging. Against this background, the current review attempts to summarize and refresh the key aspects and concepts about jigging available in the literature. The configuration, operational features, applications, types, and theoretical models of jigging are comprehensively reviewed. Three promising paths for future research are presented: (1) using and adapting concepts from granular physics in fundamental studies about the stratification phenomena in jigs; (2) implementing advanced control functions by using machine vision and multivariate data analysis and; (3) further studies to unlock the potential of dry jigs. Pursuing these and other innovations are becoming increasingly essential to keep the role of jigging as a valuable tool in future industry.

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“…In addition, the use of aggregates for the production of concretes and prefabricated elements as well as applications for general and hydrotechnical construction constitute a small but important share in the use of sands and gravels with appropriate physical and mechanical parameters for a given process. For this reason, the increasingly stringent requirements for the quality of mineral raw materials-in the case of aggregates, the highest possible degree of recovery (for gravel and sand), their reuse and the need to dispose of impurities-resulted in the search for new separation methods or improvements to existing ones [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Aggregate Production Process with Different Geometric Properties in the Light Fraction Separator

et al. 2022

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This article presents an analysis of separation results in a specially designed and activated light fraction separator used to remove impurities from mineral aggregates. Laboratory tests conducted on a quarter-technical scale involved performing experiments to ascertain the scope for adjusting the variable settings of the separator operating parameters. These include the frequency and amplitude of pulsation, the height of the heavy-product reception threshold, the size of water flow and variations in the grain size and shape of the feed. During the experiments, the degrees of chalcedonite and dolomite grain purification were studied within the range of grain size for the feed: (2.0–4.0 mm for small grains, 8.0–16.0 for coarse grains and 2.0–16.0 mm for a wide range of grain sizes). The effects of the separator were assessed based on the amount of organic impurities in each heavy product. In all experiments, very good results were obtained, because the percentage of impurities in the product after separation was below 1% in accordance with the assumed technological standard assumption. Regarding the obtained content of light impurities with the separator set to optimal operating parameters, the percentage of light impurities in the product content was reduced to below 0.1%, which meets the guidelines described according to applicable standards. Multi-variant analysis allowed the optimal operating ranges of the separator to be determined, producing refined aggregate in terms of grain size and shape. The final results were also linked to the performance of the device, and its model dependencies were also determined.

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Optimization and dust emissions analysis of the air jigging technology applied to the recycling of construction and demolition waste

Cited by 18 publications

References 20 publications

Durability, life cycle cost and life cycle assessment of binary mixtures with fly ash, rice husk ash and concrete demolition waste

Durability, life cycle cost and life cycle assessment of binary mixtures with fly ash, rice husk ash and concrete demolition waste

Jigging: A Review of Fundamentals and Future Directions

Analysis of the Aggregate Production Process with Different Geometric Properties in the Light Fraction Separator

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