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Stratification in air jigs of concrete/brick/gypsum particles
- Source :
- Construction and Building Materials, Construction and Building Materials, Elsevier, 2016, pp.63-72. ⟨10.1016/j.conbuildmat.2016.01.058⟩
- Publication Year :
- 2016
- Publisher :
- HAL CCSD, 2016.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- Language :
- English
- ISSN :
- 09500618
- Database :
- OpenAIRE
- Journal :
- Construction and Building Materials, Construction and Building Materials, Elsevier, 2016, pp.63-72. ⟨10.1016/j.conbuildmat.2016.01.058⟩
- Accession number :
- edsair.doi.dedup.....ce10936ed9dbcd1ef6944dac5c4b6e1e
- Full Text :
- https://doi.org/10.1016/j.conbuildmat.2016.01.058⟩