Stratification in air jigs of concrete/brick/gypsum particles
| Autor: | Laurédan Le Guen, Régis Sebben Paranhos, Bogdan Cazacliu, Weslei Monteiro Ambrós, Carlos Otávio Petter, Florian Huchet, Carlos Hoffmann Sampaio, Marcos L.S. Oliveira, Gerson Luis Miltzarek |
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| Přispěvatelé: | Universidade Federal do Rio Grande do Sul [Porto Alegre] (UFRGS), Granulats et Procédés d'Elaboration des Matériaux (IFSTTAR/MAST/GPEM), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-PRES Université Nantes Angers Le Mans (UNAM), Federal University of Pampa (UNIPAMPA), Laboratory of Environmental Researches and Nanotechnology Development, Centro Universitário La Salle, PRES Université Nantes Angers Le Mans (UNAM)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Gypsum
020209 energy Quadratic model PARTICULE GYPSE Stratification (water) 02 engineering and technology 010501 environmental sciences Reuse engineering.material BRIQUE 01 natural sciences 12. Responsible consumption Expansion ratio C&DW MATERIALS 0202 electrical engineering electronic engineering information engineering BETON General Materials Science 0105 earth and related environmental sciences Civil and Structural Engineering PROCEDE DE SEPARATION JIGGING Waste management business.industry AIR JIG Building and Construction [CHIM.MATE]Chemical Sciences/Material chemistry Demolition waste GRAVITY CONCENTRATION engineering Demolition MATERIAU RECYCLE business |
| Zdroj: | Construction and Building Materials Construction and Building Materials, Elsevier, 2016, pp.63-72. ⟨10.1016/j.conbuildmat.2016.01.058⟩ |
| ISSN: | 0950-0618 |
| Popis: | This work deals with the separation of concrete, brick and gypsum particles from a CDW recycled aggregate mixture. Construction and Demolition Waste materials can be handled as an ore treatment problem. Efficient sorting processes of low quality CDW recycled aggregate could allow the reuse of concrete, brick and gypsum particles. The processes also improve the remaining mixed aggregates for recycling in unbound sub-base materials, by increasing their self-cementing properties and by reducing the sulfate content through the removal of gypsum. All tests were carried out in the size range between 4 and 20 mm using a laboratory air jig. The aim of the work is to concentrate a high amount of gypsum (light material) and concrete (heavy material) particles. Three working parameters are relevant for the jigging processes control such as the sorting duration, the frequency and the expansion ratio. Each of them are studied. It was found that a quadratic model of the number of jig cycles, a product of the frequency and time, accurately predict well the sorting results, if the expansion is large enough. An optimal point seems achieved at about 320 jigging cycles. Concentrates with concrete contents higher than 90% and gypsum contents significantly lower than 1% were possible to be reached and can be an alternative in aggregates for the concrete market. Indeed, gypsum reduction in concrete concentrates was about 25 times. This level of reduction could be satisfactory in sorting real demolition products. On the other hand, contents of over 70% of gypsum concentrates were obtained, increasing the reuse and recycling abilities. |
| Databáze: | OpenAIRE |
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